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以实际刊发为准
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YANG Yang, SONG Zhaoyang, ZHANG Shengzhong, WANG Hongtao
2025,42(4)
Abstract:
There are 92 kinds of impurity ions in seawater, causing a serious impact on hydrogen production process. Compared with conventional water electrolysis, there will be severe criteria on critical materials and equipments for direct seawater electrolysis. There are still many technical barriers, challenges in engineering or large-scale for direct seawater electrolysis, and there are no advantages of the cost of whole process, limiting its commercial development extremely. In this paper, the reaction mechanism, technological difficulties and research progress are first summarized. Then, the solution and technological breakthroughs for anionic corrosion, cationic deposition and the side reactions of impurity ions are reviewed, including anode/cathode electrodes, electrolyte regulation, reaction substitution and system integration optimization. In the end, the commercial challenges and existing problems in direct seawater electrolysis are analyzed and commercial prospect is prospected.
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JIANG Lina, ZHAO Jieyun, ZUO Chunlong, TAN Wei, REN Yuanlin
2025,42(4)
Abstract:
In recent years, mussels have attracted great interest due to their strong adhesion ability independent of the material"s surface properties. At first, the paper introduced the main sources of strong wet adhesion and adhesion mechanism of mussels, and then summarized the latest research progress of mussel-inspired chemicals in flame-retardant coatings and flame-retardant additives at home and abroad, and pointed out that the mussel-inspired chemicals not only can improve the flame-retardant properties of various materials but also can endow the polymer materials with good hydrophobicity, antibacterial activity and UV resistance functions. Finally, the application prospects of mussel-inspired chemicals in the field of flame retardancy were envisioned, especially the catechol-amine-based coatings not only can achieve the adhesion function of dopamine hydrochloride but also have the advantages of good stability, easy storage and low cost, which have great potential value and development prospects in the field of flame retardancy and multifunctional modification of a variety of materials. It is pointed out that the rational use of mussel-inspired chemistry to fabricate multifunctional materials with excellent mechanical properties and develop low-cost mussel-inspired flame-retardant systems is important for future development.
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LI Kuan, SHAO Ruiqi, WANG Wei, SHI Xinyu, JIA Zhihui, LIU Shengkai, XU Zhiwei
2025,42(4)
Abstract:
High-temperature resistant nonwoven filtration materials with excellent heat resistance and structural strength are the preferred choice in industrial high-temperature fume treatment technology.This paper reviews the recent research progress in the preparation technology and functionalized modification of high temperature resistant nonwoven filtration materials.Firstly, the preparation technology and filtration mechanism of high-temperature resistant nonwoven filtration materials are elaborated, and the advantages and shortcomings of the preparation technologies of needle-punching, hydroentanglement, meltblown spinning, electrostatic spinning, centrifugal spinning, and airflow spinning are compared to the advantages and shortcomings of each preparation technology, and the five main filtration mechanisms affecting the filtration efficiency of fibrous materials, including Brownian diffusion, inertial impact, gravitational sedimentation, particle interception, and electrostatic adsorption, are briefly described.Then focusing on the finishing process and functionalization modification strategy of high temperature resistant filter materials.Introduction of special functional groups through coating finishing, laminating treatment and sol-gel impregnation, especially the use of surface modification, nanotechnology integration and catalyst application, to enhance the ability of high-temperature resistant filter materials to catalyze denitrification and desulfurization and to degrade dioxins, adsorb heavy metals and other treatment of specific pollutants.Finally, the direction of further improvement of high-temperature resistant nonwoven filtration materials in terms of heat resistance, mechanical stability, and environmental performance is envisioned.
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HUANG Wen-jun, CHEN Xuan-yu, CAI Xiao-lan, LYU Qian-jiang, FANG Yan-xiong
2025,42(4)
Abstract:
Water-based ink is currently the most development potential of environmentally friendly ink, its most important component is water-based resin linker. In recent years, there has been a growing interest in utilizing waterborne polyurethane (WPU) as ink binders for inkjet printing, as a water-dispersed environmentally friendly material, WPU has the advantages of low VOCs content, safety and non-flammability, and strong structural designability, etc. However, WPU is poor in water resistance, solvent resistance, adhesion, stability, and mechanical properties, making it necessary to explore modification approaches to meet evolving application demands as an inkjet ink. This paper firstly briefly describes the influencing factors of inkjet printing methods and WPU performance, and then focuses on the research progress of WPU modification methods, mainly on the technical characteristics, advantages and shortcomings of nine modification methods, such as diol/diamine chain expansion modification, organofluorine/silicone modification, acrylate modification, epoxy modification, nano-materials modification, biomass material modification, hyperbranched modification, click chemistry modification, and end-capping modification, as well as the enhancement and improvement of WPU performance. Finally, from the composite modification, biomass raw materials, functionalization and low solid and high viscosity four aspects of the future development trend of WPU inkjet ink connecting material prospects.
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MU Jiaqi, FANG Zhenhua, Liu Xiaohua, FENG Xiujuan
2025,42(4)
Abstract:
Using sour jujube wood chips as raw materials, nitrogen-modified jujube wood based biochars were obtained through urea modification. Based on this, nitrogen alkali coupling modified biochars were successfully obtained through KOH activation. The influence of activation temperature, activation time, and impregnation KOH mass fraction on the comprehensive adsorption performance of coupled modified biochars was investigated through orthogonal experiments. The best performing coupled modified biochar was selected under a simulated power plant flue gas environment (15 vol% CO2, 0.1 MPa, 25 ℃, 2.1 m/min), and its CO2 dynamic adsorption characteristic was studied under varying operating conditions (flue gas temperature, inlet flow rate, and CO2 concentration). Current work indicates that the selected coupled modified biochar exhibited the highest CO2 dynamic adsorption capacity (4.17 mmol/g) under the simulated flue gas environment, with good regeneration characteristic(96.6%) and water resistance(95.4%). Furthermore, the CO2 dynamic adsorption capacity of the selected coupled modified biochar was found to be negatively correlated with adsorption temperature and inlet flow rate, and positively correlated with CO2 concentration. The optimal adsorption conditions identified were adsorption temperature of 25 ℃, intake flow rate of 8.4 m/min, and intake CO2 concentration of 15 vol%. The CO2 dynamic adsorption capacity is 3.59 mmol/g, and the penetration time is 33.8 s.
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YANG Jianwei, LI Shihuan, CHEN Shiyu, LIU Ye
2025,42(4)
Abstract:
Polyketone is a type of green polymer material, which has excellent impact strength, chemical, heat and wear resistance, and gas barrier properties. Therefore, such materials have found widespread applications in packaging, mechanical and electronic devices. Currently, the cationic palladium coordinated bidentate diphosphine ligand is the industrial catalyst for the commercial polyketone production, which suffers from high cost and catalyst recovery issues. Therefore, nickel complexes are appearing as cheaper and more alternative candidates for palladium catalyst and it represents a research frontier in such field. In this study, a series of nickel coordinated diphosphazane monoxide (PNPO) complexes have been designed based on the electronic modulation, and such catalysts are used for copolymerization of ethylene with CO and terpolymerization with propylene, in order to explore the relationship between catalyst structure and catalytic performance. It is discovered that the installations of N,N-dimethyl on aryl, 2,6-dimethoxyl phenyl on phosphorus and N,N-diethyl on phosphine oxide moieties, and tetrakis (3,5-bis- (trifluoromethyl)phenyl)borate) as metal counterion generates a highly active nickel catalyst, yielding a productivity of 15982 g PK (g Ni)-1 for copolymerization. In particular, such nickel can catalyze the terpolymerization of ethylene, CO with propylene, affording commercial polyketone with low melting temperature and easy processibility.
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HE Dejian, WANG Zhenhua, LIU Baoying, FANG Xiaomin, XU Yuanqing, DING Tao
2025,42(4)
Abstract:
A variety of metal ions were used to modify melamine polyphosphate (MPP),creating metal ion-modified MPP (referred to as J-MPP), which was then compounded with aluminum diethylphosphinate (ADP) to enhance the flame retardancy of PA6/GF composite materials. The investigation focused on the impact of different metal ions on the flame retardant and mechanical properties of the PA6/GF flame retardant system. The results demonstrated that the PA6/GF/J-MPP composites exhibited superior flame retardant performance compared to the PA6/GF/MPP system. Notably, the PA6/GF composite containing aluminum ion-modified MPP (Al-MPP) achieved a UL-94 V-0 rating in vertical burning tests, with a limiting oxygen index (LOI) reaching 31.7%. Additionally, the total heat release (THR) of the PA6/GF/Al-MPP composite was reduced to 139.1 MJ/m2, and the char residue increased to 41.5%, indicating that Al-MPP significantly improves the condensed phase flame retardant effect of the PA6/GF composite material. The introduction of metal ion-modified MPP also contributed to the enhancement of the composite material’s mechanical properties. Compared to the PA6/GF/MPP system, the PA6/GF/J-MPP composites showed improvements in mechanical performance, particularly the PA6/GF/Mg-MPP, whose notched impact strength increased to 8.5 kJ/m2, an increase of 14.9%.
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ZHANG Yingke, LI Shu-yi, CHENG Shi-yuan, LI Xuyang
2025,42(4)
Abstract:
The main components of coke oven gas are hydrogen (H2) and methane (CH4), and separating the two gases has important industrial value. Maleic anhydride grafted polypropylene (MAPP) was used as the matrix of the H2 separation composite membrane. Beta-cyclodextrin (β-CD) and ethylenediamine-modified beta-cyclodextrin (mβ-CD) were used as fillers. Methylcyclohexane (EC) and N,N-dimethylacetamide (DMAC) were used as solvents. A series of β-CD/MAPP membranes and mβ-CD/MAPP membranes were prepared by the solution blending method. The prepared membranes were characterized by FTIR, XRD, TGA, and SEM. Based on the H2/CH4 separation performance test of the membranes, the effects of the addition amounts of β-CD and mβ-CD (mass percentage based on MAPP) on the H2 permeability and H2/CH4 separation selectivity of β-CD/MAPP membranes and mβ-CD/MAPP membranes were investigated. CD molecules have a hollow cavity structure, which loosens the membrane microstructure and improves the H2 permeability of the CD/MAPP membranes. The good bonding between CD fillers and the MAPP matrix further improves the H2/CH4 separation selectivity of the CD/MAPP membranes. The results show that the addition of β-CD and mβ-CD can improve the H2/CH4 separation performance of the MAPP membrane. With the increase of β-CD addition (25%, 50%, 75%), the H2 permeability of β-CD/MAPP membranes gradually increased from 448 mol/(m2·s) to 519 mol/(m2·s), and the H2/CH4 separation selectivity first increased and then decreased. The 50%β-CD/MAPP membrane had the highest H2/CH4 separation selectivity (66.6), which was 5.7 times that of the MAPP membrane (11.7). With the increase of mβ-CD addition (25%, 50%, 75%), the H2 permeability of mβ-CD/MAPP membranes gradually increased from 410 mol/(m2·s) to 489 mol/(m2·s), the H2/CH4 separation selectivity first increased and then decreased. The 50%β-CD/MAPP membrane had the highest H2/CH4 separation selectivity (73.7), which was 6.3 times that of the MAPP membrane (11.7). Under the same filler addition amounts (25%, 50%, 75%), the H2 permeability of the β-CD/MAPP membranes was higher than that of the mβ-CD/MAPP membranes, but the H2/CH4 separation selectivity was lower.
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DONG Jian-sheng, ZHUANG Zi-heng, YIN Yun-jie
2025,42(4)
Abstract:
Nitrogen-doped carbon dots (N-CDs) were synthesized utilizing tryptophan and o-phenylenediamine as precursors, with ethanol and water serving as solvents, via a solvothermal method. The effects of the molar ratio of tryptophan to o-phenylenediamine (n(tryptophan)：n(o-phenylenediamine)) and the reaction duration on the synthesis of N-CDs were assessed based on the quantum yield measurements of the N-CDs. The morphology, structural composition, and thermal stability of the N-CDs were characterized and evaluated employing FTIR, XRD, TEM, XPS, and TGA techniques. The optical characteristics of N-CDs were investigated through fluorescence spectroscopy, quantum yield quantification, and fluorescence lifetime assessments. The outcomes demonstrated that the N-CDs synthesized with a n(tryptophan)：n(o-phenylenediamine) ratio of 1.5:1 and a reaction duration of 6 hours exhibited the optimal quantum yield (13.95%). The N-CDs possessed a spherical structure with an average diameter of 3.65 nm and a surface enriched in polar functional groups, including amino, hydroxyl, carboxyl, and carbonyl groups. The peak excitation and emission wavelengths of the N-CDs were 535 nm and 601 nm, respectively, with an absolute quantum yield of 21.39% at 535 nm. The solution of N-CDs displayed blue fluorescence under acidic conditions and a pink hue without fluorescence under alkaline conditions, indicating pH-sensitive color and fluorescence changes.
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YANG Xu-pei, Ai Xin-yan, ZHANG Lin, YAO Yu-yuan, WANG Wen-tao
2025,42(4)
Abstract:
Phase change material has the capability to absorb or release amounts of energy through phase transition, making it extensively utilized in the field of temperature regulation. In particular, phase change coating is a unique form of phase change material that can be administered onto the surfaces of objects owing to its distinctive adaptability and ease of use, making it more attractive in practical applications. However, phase change materials currently suitable for coatings only exist in the form of microcapsules. It is a great challenge to expand the application of phase change materials in coatings. Moreover, inorganic or organic pigments are commonly incorporated to fulfill the color requirements of coatings. These pigments often have limitations such as high toxicity and susceptibility to photo-oxidative fading. Hence, it is of great significance to develop novel colored thermoregulation coatings that are both environmentally friendly and color-stable. This work utilized hollow silicon dioxide nanospheres (H-SiO2), a non-iridescent structural color material, as the coloring element and stearic acid (SA) as the component for the phase change to create colored thermoregulation paints (H-SiO2@SA). Additionally, a water-based acrylic emulsion (WA) was employed as a binding agent to prepare a shape-stable phase change coating with non-iridescent structural color by applying layers of WA, H-SiO2@SA, and WA onto the surface sequentially. It is demonstrated that the coating has a maximum melting phase change enthalpy of 70.01 J/g and a crystallization phase change enthalpy of 67.57 J/g, respectively. The optical properties are stable even when the coating is exposed to high temperatures. Moreover, even after undergoing rigorous treatments such as strong acid and alkali immersion, repeated friction, and water washing, the structural color of the coating remained. Furthermore, the coating has good thermal stability and does not decompose within 150℃. The enthalpy and temperature of the phase change of the coating do not change after 100 thermal cycles. In addition, the high phase change enthalpy endows the coating thermoregulation function, which makes it potential for thermal management applications. This study not only provides a new idea for the combination of structural color materials and phase change materials but also provides a new method for the simple preparation of intelligent thermoregulated structural color materials.
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WANG Chenliang, PENG Panpan, YANG Jianjun, WU Qingyun, WU Mingyuan, ZHANG Jian''an, LIU Jiuyi
2025,42(4)
Abstract:
A series of multiple dynamic bond synergies base self-healing polyurethanes (SPPU) were synthesized via reaction of terephthalaldoxime, which was prepared from hydroxylamine hydrochloride and terephthalaldehyde, with polytetrahydrofuranediol, isophorone diisocyanate and bis(4-hydroxyphenyl) disulfide. Characterization of the synthesized benzaldehyde dioxime and SPPU was conducted using 1H NMR and FTIR, confirming the synthesis of self-healing polyurethane containing oxime and aromatic disulfide bonds. Evaluation of SPPU self-healing capability was performed through scratch and healing tests. Quantum chemistry calculations were employed to determine the bond energies of the two types of hydrogen bonds in the polyurethane, and a discussion on the principles of self-healing ensued. The findings revealed that in a series of polyurethane elastomers, SPPU-3 exhibited the optimal comprehensive performance, with oxime and disulfide bonds each comprising half of the chain extender. After 2 hours of healing at room temperature, scratches nearly vanished, and after 48 hours of healing at the same temperature, the polyurethane achieved a self-healing rate of 93.78%.
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LI Zhiyi, HOU Yin, WEI Wei, LIU Fengxia, XU Xiaofei, LIU Zhijun
2025,42(4)
Abstract:
Perovskite thin films often have numerous defects on their surface and at their grain boundaries. These defects can lead to nonradiative complexation of photogenerated carriers, which can significantly reduce the photovoltaic performance of photovoltaic devices. Oxygen-doped graphite-phase carbon nitride (g-C3N4-O) was utilized as an interfacial modification layer in perovskite solar cells (PSCs). The modification of the perovskite films resulted in preferential orientation of the (110) facets. The crystallinity of the (110) facets with high photovoltaic performance increased from 75.11° to 78.62°, and the half-peak width decreased by 37.73%. The film surface is now flatter, more uniformly dense, and free of pinholes. The interfacial fluorescence lifetime has been reduced by 32.51%, and the charge transport and extraction capacity have significantly increased. XPS demonstrated that the N atoms in g-C3N4-O bonded with the under-coordinated Pb ions in the perovskite films, passivating the deep energy level defects at the interface and improving charge transport and extraction.
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GENG Xue, MA Chi, JI Han-feng, Lee Tin Sin, JIANG Yan, MA Jinbao
2025,42(4)
Abstract:
Polymer-based damping materials are widely used in various industrial fields due to their excellent vibration reduction performance. With the enhancement of environmental awareness, the preparation of high-performance damping composites using green renewable resources is of great significance for the sustainable development of this field. In this study, coffee grounds modified polyurethane-based damping composites were prepared by two-step method. The effects of coffee grounds content and particle size on damping properties, thermal stability, tensile strength and elongation at break were studied by means of DMA、TGA and universal mechanical testing machine. The results show that the damping and mechanical properties and thermal stability of the composite can be effectively improved by adding appropriate amount of coffee grounds. When the mass fraction of coffee grounds is 10 %, the damping effect of the composite is best, the loss factor is up to 0.66, the tensile strength increases by 33.8%, and the elongation at break increases by 12.9%.
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DONG Jing-wen, ZHANG Yong-qin, LIU Yin-chun, LIU Jian-rui, LIU Fang
2025,42(4)
Abstract:
Through the carboxymethylation reaction of dextran to synthesize carboxymethyl dextran (CMD). With glycyrrhetinic acid (GA) as the hydrophobic group and cysteamine (CYS) as the linking arm, the glycyrrhetinic acid-cysteamine (GA-SS-NH2) was synthesized through amidation reaction. Then through the amidation reaction of CMD and GA-SS-NH2, a kind of amphiphilic polymer carboxymethyl dextran-cysteamine-glycyrrhetinic acid (CMD-SS-GA) was synthesized. Ultimately, the redox-responsive drug-loaded micelles encapsulating doxorubicin (DOX) were prepared via self-assembly, which is CMD-SS-GA/DOX. The structural composition and morphology of CMD, GA-SS-NH2, CMD-SS-GA, and CMD-SS-GA/DOX were characterized by using MS, FTIR, 1HNMR, DLS, and TEM. The carboxymethyl substitution degree of CMD was determined by the back titration method, and the hydrophobic group substitution degree of CMD-SS-GA was determined by the 1HNMR method. Through the drug release experiment, the redox sensitive drug release feature of CMD-SS-GA / DOX was tested. The results showed that the carboxymethyl substitution degree of CMD was 2.04 and the hydrophobic group substitution degree of CMD-SS-GA was 0.32 to 0.83. The CMD-SS-GA / DOX prepared under the optimal conditions was a uniform spherical shape, with an average particle size of 117.7 nm and a polydispersity coefficient (PDI) of 0.139. The loading capacity and encapsulation efficiency were 11.6% and 57.1% respectively. The cumulative release amount of DOX of CMD-SS-GA / DOX in 10 mmol/L glutathione phosphate buffer solution (pH = 6.5, 7.4) within 24 hours reaches more than 80%, which has redox sensitivity.
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WEI Jiafeng, LIU Xingxing, NING Junhua, JIA Kangle, HUANG Linjia, SU Qiuping, LI Huanling, XIN Jinlan, ZHENG Xiaoshan, YU Longfei
2025,42(4)
Abstract:
The zwitteronic copolymer P(MPC-co-DMA) (PMPCD) was synthesized based on the free radical copolymerization using dopamine methacrylamide (DMA) and 2-methacryloyloxyethyl phosphorylcholine (MPC) as monomers. The PMPCD was grafted onto substrate surface with dopamine (DA) as the anchor, forming an antifouling coating. Furthermore, silver ions were reduced to silver nanoparticles (AgNPs) by polydopamine (PDA) in situ, achieving the preparation of a dual-functional PDA/PMPCD-AgNPs coating with antifouling and antibacterial properties. The PDA/PMPCD-AgNPs coating was characterized by SEM and XPS, confirming the successful preparation of the coating. According to the results obtained from water contact angle measurements, antibacterial assays and biocompatibility experiments. the introduction of PDA/PMPCD-AgNPs coating significantly enhanced the hydrophilicity, antibacterial efficacy and biocompatibility of the substrate surface. Specifically, the antibacterial rates against Escherichia coli and Staphylococcus aureus were both above 97%, the anti-protein adsorption rate reached 94%. Moreover, it could reduce platelet adsorption and inhibit platelet activation while demonstrating low hemolysis rates and excellent cell viability. Therefore, this dual-functional anti-fouling and antibacterial coating holds wide application prospects in the field of biomaterials.
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WANG Xiao-yue, LIU Xue, LIU Chun-huan, LIU Jing, YANG Cheng
2025,42(4)
Abstract:
The α-galactosidase enzymatic hydrolysis was applied to enhance the antioxidant activity of Dendrobium nobile polysaccharide. The optimum enzymolysis conditions were determined by single factor and response surface tests: α-galactosidase dosage 20 U/mL, pH 7.0, at 46 ℃ for 11 h. The polysaccharide DNP-30 was further hydrolyzed according to the optimal enzymatic hydrolysis conditions to obtain DNP-30E. The structure and antioxidant activity of DNP-30 and DNP-30E were analyzed. The results showed that the content of reducing sugar increased from 0.63% to 48.66% after enzymolysis, and weight-average molecular weight decreased from 7.95×105 Da to 2083 Da. Enzymolysis may break Glu(1α→6)-Man bond in DNP-30 and reverse the configuration of glucose terminal hydrogen. When the concentration is 2 mg/mL, the scavenging rate of ·ABTS increased from 22.92% to 47.87%, the scavenging rate of ·OH increased from 31.46% to 56.75%, the scavenging rate of ·O2- increased from 24.52% to 35.61%, the FRAP value increased from 141.67 to 441.06 (0.4 mg/mL). When the concentration of polysaccharide was 5~10 mg/mL, the cytotoxicity of DNP-30E was significantly reduced compared with DNP-30. Based on the oxidative stress model of HaCaT cells stimulated by SDS, when the concentration is 0.5 mg/mL, compared with DNP-30 group, ROS content in DNP-30E group decreased by 34.21%, MDA content decreased by 50.20%, and SOD activity increased by 84.17% The results suggested that the enzymatically degraded polysaccharides of Dendrobium nobile has the potential to be developed into a new natural antioxidants.
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WANG HE-rong, LIU Sen-qun, CHEN Jia-yao, LIAO Xing-cai, ZENG Rong, DING Shun-min
2025,42(4)
Abstract:
A series of porous organic polymer (POP) supports were synthesized by simple Friedel-Crafts reactions using toluene, phenol, and hydroquinone as monomers. Pd nanoparticles were loaded onto the supports through impregnation and reduction, resulting in a series of porous organic polymer-supported Pd nano-catalysts with varying hydroxyl contents. The catalysts were characterized using FTIR, XRD, XPS, SEM, and TEM. The effect of surface hydroxyl groups on the catalytic dehydrogenative coupling reaction of silanes with alcohols was investigated. The results showed that the more surface hydroxyl groups on the catalyst, the stronger the interaction with Pd, leading to the best catalyst cycling stability (no significant changes in conversion and selectivity after 7 cycles). Furthermore, these catalysts exhibited excellent activity (conversion of dimethylphenylsilane >99%) and selectivity (selectivity of dimethylphenylethoxysilane >99%) in the catalytic dehydrogenative coupling reaction between dimethylphenylsilane with ethanol. Additionally, catalysts with hydroxyl groups were also suitable for the dehydrogenative coupling reactions of various silanes and alcohol substrates (targeted silyl ethers yields ranging from 34% to 99%).
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ZHAO Yu, ZHANG Yu-rong, MAO Shao-qi, LI Ning, ZHANG Dong-qiang, ZHAO Shi-lin
2025,42(4)
Abstract:
The Ag/SiO2 catalyst was prepared using the equal volume impregnation method and its catalytic performance with varying Ag loads (percentage of Ag mass based on SiO2 mass) was investigated through XRD, SEM, TEM, O2-TPD characterization, and MOP catalytic oxidation reaction test. A comparison between the microscopic morphology and catalytic properties of 15% Cu/SiO2 and 15% Ag/SiO2 revealed that the latter had higher activity. At a reaction temperature of 300 ℃, liquid space velocity of 1.8 mL/(g·h), and volume air flow rate of 80 mL/min, the conversion rate for MOP reached 95.05%, while selectivity for methoxyacetone was at 85.07%. Stable operation for up to 72 hours was achieved; however, after an extended run time of up to 80 hours, carbon deposition rates reached as high as13.5%. Compared to Cu species particle size in the former (15.2 nm), Ag species particle size in the latter (3.1 nm) is smaller with better dispersion due to oxygen adsorption type interaction between Ag and SiO2 carrier which are important factors for oxidation reactions on this catalyst system along with good carbon resistance providing favorable conditions for stability.
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Preparation and hydrodeoxygenation performance of multi-stage hole NiMo loaded Beta zeolite catalyst
LIU Yuke, GU Yufei, WANG Wei, LI Fuwei, Huang Xue, LI Zhixia
2025,42(4)
Abstract:
Beta zeolite was prepared via hydrothermal method using cheap diatomite and sodium meta-aluminate as raw material. The acidity and pore structure of the zeolite were adjusted by soft template method, organic alkali (urea) treatment and inorganic alkali (NaOH) treatment to synthesize multi-stage hole Beta molecular sieve, and bimetallic-loaded Beta zeolite catalyst (NiMo/Beta) was prepared by loading non-noble metals Ni and Mo via ultrasound-assisted impregnation method. The crystal structure, micromorphology, pore structure, acidity and metal reducibility of the catalyst were comprehensively characterized by XRD, SEM, N2 adsorption-desorption, NH3-TPD and H2-TPR. The effects of modified treatment methods and process conditions (reaction temperature, reaction H2 pressure, solvent n-dodecane amount, reaction time) on the catalyst"s catalytic performance in the hydrodeoxygenation of guaiacol were investigated. The results showed that under the conditions of 300 ℃, H2 pressure 4 MPa, reaction time 3 h and solvent n-dodecane 20 mL, the NiMo/Beta-3.0CB modified with 3.0 g CTAB in 6.0 g diatomite exhibited the best catalytic activity, and the conversion of guaiacol was 99.8%，the selectivity of cyclohexane was 92.7%; and after three times of recycling of the NiMo/Beta-3.0CB, the conversion of guaiacol was 85.7%.
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XIE Ke-nan, HE Yu-jia, ZHANG Qi, XIE Lu, HE Shuai
2025,42(4)
Abstract:
Monolayer MXene was prepared through liquid-phase layering method, followed by the addition of monolayer/few-layer black phosphorus nanosheets (BP) for the preparation of MXene/BP antibacterial composites (AC) via hydrothermal method, characterized by SEM, TEM, XRD and ZETA potentiometers. The results indicated that successful preparation of AC, meanwhile monolayer MXene uniformly distributed on the surface of BP and both connected together through van der Waals forces. Subsequently, the AC was mixed with poly(lactic-co-glycolic acid) (PLGA) using electrospinning technique to fabricate nano antibacterial film (PLGA-AC). The morphology, structure, and hydrophilicity of PLGA-AC were characterized using SEM and contact angle measuring instruments. Meanwhile the reactive oxygen species (ROS) generation capability, antibacterial performance, and biocompatibility of PLGA-AC have been also evaluated. The results showed that the water contact angle of PLGA-AC (52.05 ° ± 0.49 °) was significantly reduced, indicating its excellent hydrophilicity compared with PLGA (122.9 ° ± 10.61 °). It demonstrated good biocompatibility and blood compatibility in the evaluation of biocompatibility, with a hemolysis rate of only 0.97%. Furthermore, PLGA-AC showcased exceptional ROS generation efficacy under ultrasonic conditions, facilitating the clearance of drug-resistant bacteria by more than 99%.
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LIU Zhi-jun, LIU Qian, WANG Rong-hao, LI Zhi-yi, LIU Feng-xia, WEI Wei
2025,42(4)
Abstract:
Astaxanthin liposomes were prepared using supercritical carbon dioxide with soya lecithin as the lipid carrier. The effectiveness of the supercritical method for the preparation of astaxanthin liposomes was confirmed through the use of TEM, XRD and FTIR characterisation. The effects of preparation pressure and temperature on the particle size distribution and zeta potential of astaxanthin liposomes were investigated based on nanoparticle size analyser measurements. The encapsulation rate of astaxanthin was determined using a UV spectrophotometer, and the slow-release effect and bioavailability of astaxanthin liposomes were tested by in vitro simulated release and simulated digestion experiments. The results demonstrated that, under optimal conditions, the average particle size of astaxanthin liposomes prepared with a supercritical carbon dioxide pressure of 20 MPa and a temperature of 50 ℃ was 236 nm, with an astaxanthin encapsulation rate of 97.18%. Following a 30-day storage period, the astaxanthin retention rate of astaxanthin liposomes at 4 and 25 ℃ was 94.13% and 89.04%, respectively. In vitro release experiments demonstrated that astaxanthin liposomes exhibited The astaxanthin slow-release effect was observed to be more pronounced, with total release rates of 69.3% and 91% at 4 and 12 h, respectively. Furthermore, in vitro digestion simulations demonstrated that astaxanthin liposomes exhibited enhanced digestion and absorption in the intestine.
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LI Mengge, CHENG Meng, WANG Xiangyou, CUI Yingjun
2025,42(4)
Abstract:
Color-indicating packaging films were prepared by casting method using acetylated diastarch phosphate (ADSP) and polyvinyl alcohol (PVA) as the film base and anthocyanin extracted from purple kale as the indicator. The microstructure, physical parameters, optical and mechanical properties, and pH sensitivity, volatile ammonia sensitivity, and volatile ammonia sensitivity of the indicator packaging films prepared were investigated by using SEM, FTIR, and XRD characterization based on the physical property measurements of thickness, opacity, water absorption, and oxygen permeability of the films, as well as by tensile strength and elongation at break, pH indicator, volatile ammonia response, and soil-buried degradation tests, which investigated the microstructure, physical parameters, and optical and mechanical properties of the indicator packaging films prepared in the ratio of ADSP to PVA, as well as pH sensitivity, volatile ammonia sensitivity , and bioconsequential effects. The results showed that the interaction between PVA and ADSP formed hydrogen bonds, which significantly enhanced the dense structure of the indicator packaging film, and the indicator packaging film prepared by mixing ADSP solution with PVA solution at a volume ratio of 5:5 had the best overall properties, with an opacity of 0.112 mm-1, a water absorption of 24.57%, a water solubility of 21.23%, an oxygen permeability of 26.41 g/(m2?d), tensile strength of 15.59 MPa, elongation at break of 301.89%, and water vapor transmission rate of 2.98?10-10 g/(m?s?Pa); The incorporation of anthocyanins enhanced the light-blocking ability of the indicator packaging films and conferred them with significant color responsiveness to pH (2~12), and exhibited a short response time (10 s) to volatile ammonia, and sensitivity to a low detection limit (molar fraction of 1×10-6), and were all biodegradable because of the incorporation of ADSP.
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Research and application of high efficiency pour point depression and oil displacement microemulsion
MENG Yong, ZHANG Weidong, GUO Rong, LI Yingcheng
2025,42(4)
Abstract:
In order to enhanced the oil recovery in high pour point oil reservoir, a microemulsion with high pour point depression and oil displacement performance is mainly prepared with anionic/cationic surfactants (sodium stearyl ether carboxylate and octadecyl trimethyl ammonium bromide) and pour point depressant (mixture of polyacrylates and ethylene-vinyl acetate copolymers). Pour point, phase behavior, solubilizing components analysis, interfacial property, core flooding and a series of tests are carried out to evaluate the performance of the microemulsion. The results show that the microemulsion has good pour point reducing performance and the reduction rate is more than 34%. Phase behavior tests show that the microemulsion has good emulsifying performance, especially for the long chain alkane. The microemulsion can reduce the oil-water interfacial tension to 10-3 mN/m. The field test shows that the maximum water cut of the wells decreased from 94.8% (w) to 89.1% (w), and the maximum daily oil production increased from 4.5 t to 7.7 t, which can achieve a good effect of enhanced oil recovery.
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LIANG Yu-rong, WANG Lei, WANG Rui, LI Yu-long, LAI Xiao-juan, LI Peng, NIU Ya-ni
2025,42(4)
Abstract:
In this paper, 15-bromo-1-pentadecanol, dimethylamine water, epichlorohydrin, and sodium 3-chloro-2hydroxypropanesulfonate were used as the raw materials, and the intermediates were obtained by quaternization, and then the final product, betaine surfactant TAC, was obtained by ring-opening reaction.The structure of TAC was characterized by FTIR and 1H NMR, and its performance was tested by a surface tension meter and conductivity meter. The effect of betaine surfactant (TAC) on the temperature resistance and shear resistance of thickening acid (SY) was investigated by six-speed rotational viscometer, rheometer, and swept surface electron microscope. The results showed that TAC had a low critical micelle concentration (CMC), and the lowest CMC was 0.11 mmol/L at 298.15 K. The addition of TAC with a mass fraction of 0.4% significantly improved the temperature and shear resistance of the thickening acid SY. The final viscosity of the solution was 80.54 mPa-s when the solution was heated up to 180 ℃, and the final viscosity of the solution after continuing to shear for 1 h was 75.48 mPa-s. The apparent viscosity increased by 77.52% compared with that of SY thickening acid without TAC. This system can be used for deep-well, high-temperature acid fracturing.
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YIN Yue, BAI Yang, GAO Tengteng, DUAN Yihao, YU Xinbo, FEI Guiqiang
2025,42(4)
Abstract:
Using neopentylene glycol (NPG), terephthalic acid (PTA) and polyols of different structures as precursors, polyester resin (PE) was synthesized by vacuum polycondensation after melting esterification and dehydration, and then using flexible monomer dodecanediacid (DDDA) for end-sealing reaction. The PE was cured with triglycidyl isocyanurate (TGIC) to prepare the low temperature curing powder coating (CPE), and then the coating (TPE) was prepared by baking at 160 ℃ for 10 min. Combined with FTIR, 1HNMR, XRD, SEM, TGA, DSC, storage stability, water contact angle, and salt spray experiments, the effects of diols with different structures on the heat resistance, water resistance, anti-blooming, and salt spray resistance of polyester resin, CPE and TPE were investigated. The results show that the glass transition temperature of polyester resin PE-5 synthesized by saturated six-membered ring structure 1,4-cyclohexanedimethanol (CHDM) can reach 56.65 ℃, and the temperature of 5% loss of mass reaches 401.06 ℃. The powder coating CPE-5 prepared therein is loose and not agglomerated at 40 ℃ after 24 h of storage, and has excellent stability in storage. The microstructure of the coating TPE-5 is dense, with good hydrophobicity and the water contact angle can reach 109.35°. The light retention rate is as high as 92.63% after the anti-blooming test, and there is no obvious blistering phenomenon in the salt spray corrosion resistance of 500 h.
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Feng Jun, ZHANG Xin-yu, ZHANG Lin-lin, WANG Fei, SHUN Da-yin, WANG NA
2025,42(4)
Abstract:
∶ Amphiphilic Janus sheets with mesoporous were synthesized by one-step method of sol-gel reaction via interface-induced phase separation of oil-in-water emulsions. The grafting amounts of hydrophilic amino groups (—NH2) and hydrophobic phenyl groups (—Ph) on both sides of Janus sheets were adjusted by changing the addition amounts of 3-aminopropyltrimethoxysilane (APTMS) and phenyltriethoxysilane (PETS), respectively. A series of Janus sheets with different hydrophilic/hydrophobic properties (α-Janus-β) have prepared. Using α-Janus-β as functional fillers of the water-based epoxy (WEP) coating to prepare Janus/WEP composite coatings. Hydrophobic and corrosion resistance of WEP coating were significantly improved because of the good dispersion of hydrophilic groups and the barrier protective layer constructed by the self-orientation of the hydrophobic groups when adding the Janus sheets which prepared by setting the mass ratio of APTMS to PETS as 2:1 (α4-Janus-β2) with 3% mass fraction of the WEP. The water contact angle of the WEP composite coating is increased from 59° to 90°. The electrochemical impedance value of the coating could reach 3.7×107 Ωcm2 after a 30-days test cycle. The coating remained protection ability during salt spray test after 1440 h.
