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以实际刊发为准
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XING Xin-xin, LIU Ji-shuang, ZHU Yan, ZHENG De-xu, GUO Xin, WU Sa-jian, GUO Xiao-jun, ZHANG Hao-xiang, LIU Shengzhong
2025,42(6)
Abstract:
In recent years, the development of flexible supercapacitors has become one of the research hotspots in the field of electrochemistry. The selection and design of electrode materials are critical to improving the performance of flexible supercapacitors. In the past few years, researchers have continuously explored and developed various new electrode materials to meet the needs of flexible supercapacitors for high energy density, high power density, long cycle life, and good flexibility and fabricability. The article summarizes common electrode materials including carbon-based materials with high conductivity, metal oxides with high theoretical capacitance, environmentally friendly organic electrode materials, metal-organic frameworks (MOFs) with unique structures and excellent electrochemistry, and Emerging two-dimensional transition metal carbon/nitride materials (MXene), etc. Research progress in flexible supercapacitors presents some current challenges faced by the field and looks forward to future development prospects. Despite significant progress, there are still some pressing issues that need to be addressed. As the research on flexible supercapacitors continues to deepen and new electrode materials continue to emerge, it is believed that flexible supercapacitors will usher in more widespread applications in wearable electronics, smart medical care, wearable sensors and other fields.
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Wang Chen, ZHANG Chu-yi, YAO Hong-rui, WANG Na
2025,42(6)
Abstract:
Modified carbon fiber reinforced polyurea composite (KH550-CF/PU) was prepared with polyurea resin (PU) as matrix, carbon fiber (CF) as reinforcer and silane coupling agent (KH550) as modifier. The microstructure and thermal properties of modified carbon fiber and its reinforced polyurea composites were investigated by SEM, FTIR, XRD and DSC. The results showed that silane coupling agent KH550 was successfully modified on the surface of carbon fiber to enhance the compatibility and wettability of carbon fiber and polyurea resin. The mechanical and anti-explosion properties of KH550-CF/PU composites were studied by quasi-static tensile and compressive tests and Hopkinson compression tests. The results show that the mechanical properties of the composites are obviously better than that of pure PU, especially KH550-CF/PU. The maximum tensile stress is 22.88MPa, the maximum tensile strain is 223.95%, the maximum compressive stress at the elastic stage is 2.17kN, the energy absorption is 0.64Mj·m-3, and the yield strength is 103.18MPa at 5000s-1.
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WU Jing-yi, YAO Li-hui, LI Chuan-ying, QIU Dan
2025,42(6)
Abstract:
The maleic anhydride-modified corn starch was prepared from corn starch by sodium carbonate pretreatment in maleic anhydride molten system, and the composite material, maleic anhydride-modified corn starch/polylactic acid, was composited with polylactic acid. The 1HNMR test method for the degree of substitution of maleic anhydride-modified corn starch was established and optimized by one-way and response surface experiments using the degree of substitution as the response value; the micro-morphology, structural composition and thermal properties of maleic anhydride-modified corn starch were characterized by SEM, FTIR, XRD and DSC, and the mechanical properties and hydrophobic properties of the maleic anhydride-modified corn starch/polylactic acid were tested by using a universal testing machine and a water contact angle measuring instrument. mechanical and hydrophobic properties. The results showed that the optimal corn starch pretreatment process was as follows: sodium carbonate solution concentration of 0.97 mol/L, mixing time of 51.5 min, and starch mass of 2.5 g in 100 mL sodium carbonate solution, and the degree of substitution of maleic anhydride-modified corn starch (MA-ST-1) was 0.790, which was 91.7% higher than that of the modified starch prepared with the traditional technique (0.412) It was confirmed that the sodium carbonate pretreatment process effectively enhanced the conversion rate of esterification reaction. MA-ST-1 had smaller crystallinity (22.79%) and lower melting temperature (98.9 ℃), and the tensile strength and elongation at break of MA-ST-1/poly(lactic acid) were 47.771 ± 0.675 MPa and 13.728% ± 1.369%, respectively, and the water contact angle was 75.86° ± 1.19°. In the composite MA-ST-1/polylactic acid, the hydrolyzed product of maleic anhydride, butenedioic acid, acted as a bridge between corn starch and polylactic acid, which enhanced the mechanical properties and interfacial compatibility of the composite.
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JIA Wan-he, LIU Han-yu, WANG Ke-wei, LIU Chun
2025,42(6)
Abstract:
Three neutral cyclometalated platinum(Ⅱ) complexes were synthesized by liquid-phase coordination complexation. All complexes show aggregation-induced phosphorescence emission (AIPE) properties in THF/H2O. These complexes can be used to detect picric acid in the aqueous phase with a minimum detection limit of 0.10 μmol/L. In the presence of the compounds similar in structure to picric acid or common ionic compounds, the three complexes exhibit high selectivity for detecting picric acid. Moreover, all three complexes can successfully detect picric acid in various natural environments, including seawater, river water, rainwater, and tap water. The mechanism for the detection of picric acid by platinum(Ⅱ) complexes was confirmed to be photo-induced electron transfer through density functional theory calculations and other analytic methods.
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SONG Qiaoying, ZHAO Baoyi, LIU Ziqing
2025,42(6)
Abstract:
The process parameters of extracting Tremella fuciformis Berk. polysaccharides from deep eutectic solvent (DES) were optimized in this study, including DES composition, solid-liquid ratio, ultrasonic power, ultrasonic time, and ultrasonic temperature. The results showed that the optimal extraction technology was solid-liquid ratio 1:35 (g/mL), DES water content 15%, ultrasonic time 40 min, ultrasonic temperature 60℃, ultrasonic power 200W, and the highest extraction rate was 24.73%. Subsequently, the experiment was carried out on diabetic mice with Tremella fuciformis Berk. polysaccharide obtained by this extraction method. The results showed that Tremella fuciformis Berk. polysaccharide could significantly reduce the blood glucose, oxidative stress and inflammatory response of diabetic mice, improve the body weight, glucose tolerance and insulin sensitivity of mice, and improve the state of glucose metabolism of mice. In terms of intestinal flora analysis, this study used high-throughput sequencing technology to sequence the intestinal flora of mice, and analyzed the effect of Tremella fuciformis Berk. polysaccharide on the structure of intestinal flora. The results showed that Tremella fuciformis Berk. polysaccharide could significantly increase the number of beneficial bacteria in the intestines of mice. For example, the abundance of Ddferribacterota, Verruconicrobia, Actinobacteria, Bacteroidetes and Firmicutes, while reducing the proportion of harmful bacteria, Such as Campilobacterota and Proteobacteria and so on, which helped to improve the intestinal environment of mice and improve the level of intestinal health. This study not only provided a new method for the efficient extraction of tremella polysaccharide, but also revealed the positive effects of tremella polysaccharide on the intestinal flora of diabetic mice.
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YU Si-wei, ZHONG Zhaohuang, LI Xindong, JIA Jianghui, CAI Meng, BAO Luo, ZHU Qinyan, HUANG Wanfu
2025,42(6)
Abstract:
Tannic acid (TA) was encapsulated on the surface of MOF-808 via a blending method to synthesize TA@MOF-808 composite nanomaterials. These nanomaterials were then incorporated into a polyetherimide (PEI) ultrafiltration membrane using the phase inversion technique. The TA@MOF-808 doped PEI ultrafiltration membrane was characterized by FTIR, XPS, SEM, AFM and contact angle measurements (CA)to assess functional groups, chemical structure, surface morphology, cross-sectional structure, surface roughness, and hydrophilicity. The results demonstrated that when the mass fraction of TA@MOF-808 was 0.04%, the ultrafiltration membrane exhibited superior performance, achieving a pure water flux of approximately 926.1 L·m-2·h-1 under an operating pressure of 0.1 MPa and a rejection rate of 93.9% for a 0.1 g/L bovine serum albumin (BSA) solution. In a 14-day long-term stability test conducted in a dilute sulfuric acid solution at pH 3, the pure water flux remained stable between 840-845 L·m-2·h-1, with a rejection rate of 97.5% and a flux recovery rate exceeding 93%, indicating excellent separation performance and structural stability.
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YUAN Qinxuan, YUAN Minglu, YOU Shiquan, SHI Doudou, LI Meng, WANG Changtao
2025,42(6)
Abstract:
The fermentation broth of Isodon rubescens (Hemsl.) H. Hara was prepared using lactic acid bacteria and Saccharomyces cerevisiae as fermentation strains, and compared with the water extract obtained by direct water extraction. The antioxidant and anti-inflammatory activities of the fermentation broth were evaluated by biochemical and cell experiments in vitro. The results showed that microbial fermentation could increase the content of active ingredients in samples extracted by Isodon rubescens. Among them, compared with the Isodon rubescens water extract, the total sugars concentration of the Isodon rubescens lactic acid bacteria fermentation broth has the most significant increase, from 1.714±0.004mg/mL increased to 3.695±0.010mg/mL. The fermentation broth showed stronger antioxidant capacity than the aqueous extract in DPPH, ABTS and hydroxyl radical clear assays, and the free radical scavenging capacity of the Isodon rubescens Saccharomyces cerevisiae fermentation broth was slightly higher. In the other two groups of samples, the ABTS free radical scavenging rate was significantly improved compared with the Isodon rubescens water extract. In the cell experiment, after the inflammatory response of cells stimulated by lipopolysaccharide (LPS), the expression levels of inflammatory factors in the three samples were significantly reduced, and the effect of the two fermentation broth was stronger than that of the water extract, showing better anti-inflammatory activity.
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SHI Hong-ling, FU Mu-ran, Xu Qian, HUANG Hong-hui, YAO Lun-guang, TANG Cunduo
2025,42(6)
Abstract:
CO2 reduction and conversion are the most attractive alternative to mitigate the greenhouse effect. However, the traditional CO2 reduction technologies had high energy consumption and low efficiency. Bioelectrocatalysis is a new green and efficient catalytic CO2 reduction technology emerging in recent years, which combines the advantages of biological enzymtic catalysis and electrocatalysis, can efficiently realize the conversion of chemical energy and electric energy, improve the efficiency of electron transfer in redox reaction, and provide a potential solution for alleviating the greenhouse effect and producing value-added fine chemicals. In this paper, the characteristics and four-stage development of bioelectrocatalysis technology are briefly described. Then, the types of electrode materials for bioelectrocatalysis (including carbon felt, graphite rods, etc.), the selection of electrocatalysts (especially biocatalytics including enzymes and microbial cells), cofactors (such as natural cofactors reduced coenzyme I and artificial cofactors, etc.) and reduction products (formic acid, methane, methanol, acetic acid, etc.) are systematically summarized. Finally, the feasible research directions of CO2 reduction in the future are prospeced, including the development of novel materials that can adsorb CO2 and immobilize microbial cells with enzyme or CO2 reduction activity. To improve the efficiency of bioelectrocatalysis, the design of electrode materials and reaction system was optimized. Fully integrate the latest technologies in metabolic engineering and systems biology.
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WANG Bo, LI Jingwen, FEI Chao, LI Chen, FAN Zhiping
2025,42(6)
Abstract:
This review comprehensively discusses the recent advances in biochar-based layered bimetallic (BC/LDHs) composites in the field of environmental pollutant removal. Firstly, the preparation methods of BC/LDHs materials, including co-precipitation, co-pyrolysis and hydrothermal synthesis, and the modulation of material properties by means of heterogeneous atom doping, chemical impregnation and fugitive magnetization enhancement are discussed in detail. Secondly, the effectiveness of BC/LDHs materials in the removal of dyes, heavy metals, nutrient salts and antibiotics was clarified, and the key mechanisms of their removal of environmental pollutants were analyzed and summarized. Further, the limitations of BC/LDHs materials in environmental applications are assessed, including the removal efficiency of specific pollutants, the adaptability under complex environmental conditions, and the long-term stability of the materials. Finally, corresponding solution strategies are proposed to address these challenges, providing new perspectives and research directions to promote the application of BC/LDHs materials in environmental pollutant removal.
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2025,42(6)
Abstract:
Compared with traditional hydrogels, self-healing hydrogels have excellent self-healing properties and biocompatibility. They are ideal materials in the fields of biology, medicine and materials, and have important research significance. In recent years, as a new type of profile control and water plugging material, self-healing gels have also been widely studied in the field of petroleum engineering. These hydrogels can completely restore their structure and properties by forming new crosslinking networks after being damaged, showing superior mechanical properties and stability compared to traditional hydrogels. However, there is still a lack of systematic summarization and understanding of their self-healing performance. Therefore, this paper introduces the mechanism of self-healing gel, summarizes the types of self-healing gel applied in the field of oil and gas development, focuses on the evaluation methods of self-healing performance of self-healing gel at different stages, and analyzes the factors affecting self-healing performance, so as to provide design ideas and references for future research. At the same time, the application prospect of self-healing gel in oil and gas development is prospected.
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LiShunyang, DaiChaomeng, ZHANG Jun-bo, HU Jia-jun, GUO Ji-feng, ZHANG Ya-lei
2025,42(6)
Abstract:
Due to the stability and strong oxidizing properties of persulfate (PS), persulfate-based advanced oxidation processes (PS-AOPs) has attracted extensive attention in recent years, especially in the remediation of organic pollutants. Persulfate typically requires catalysts for efficiently removal of organic pollutants, which carbon materials have become good catalysts of persulfate as a result of being green, high efficiency and cost-effective. Therefore, in recent years, significant progress has been made in the research and exploration of activated persulfate technology for carbon materials, covering aspects such as degradation mechanisms, types of carbon materials, influencing factors, and technological coupling. But there are few systematic review articles related to these advances. So this paper reviews these advances and provides a prospect on the development and applications of this technology.
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WANG Ji, YANG Qian, ZHAO Xiao, LIU Sheng
2025,42(6)
Abstract:
Recently, physical stimuli-responsive wormlike micelles have received considerable attention from both scientific and technological perspectives due to their tunable rheological properties. Compared to chemical triggers including pH, CO2 and redox agents, physical stimuli show distinct advantages such as ease of operation, no byproducts, environmental friendliness and non-invasiveness. We herein review the advances in physical stimuli responsive wormlike micelles regarding fabrication strategies, responsive mechanisms, rheological properties and practical applications. The existing studies mainly focus on the system construction and fundamental theoretical aspects. The inefficient trial-and-error method dominates the fabrication methods, while the related applications are still in the laboratory stage. Therefore, future preparation approaches should be combined with artificial intelligence techniques including big data simulation and machine learning. Meanwhile, it is highly desirable to investigate the performance changes and response characteristics of physical stimulation-responsive wormlike micelles for their large-scale production and application in the field implementation.
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2025,42(6)
Abstract:
9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and its derivatives have garnered significant attention in the realm of flame retardancy treatments for epoxy resins due to their abundant P—H bonds and gas-phase flame retardant properties. However, the addition of DOPO can adversely affect the mechanical strength and other properties of the materials. With the increasing demand for a balance between flame retardancy and overall performance of epoxy resins in modern society, the construction of composite systems is beneficial for maintaining the overall performance indicators of the materials. Here, this article provided a comprehensive overview of the research advancements in DOPO-based derivative synergistic flame retardants for epoxy resins over the past five years, particularly focusing on the effective components such as DOPO-N, DOPO-P, DOPO-S, DOPO-Si, DOPO-C, and DOPO-bio-based materials. The flame retardant performance and mechanical performance indicators of the modified composite materials were discussed in detail. Although a large number of DOPO derivatives have been designed for flame retardancy in epoxy resins, there are still a few concerns that need to be addressed, such as complex production processes, unclear flame retardant mechanisms, and incomplete environmental safety assessment systems. The trend of DOPO derivatives is to use chemical structure modification techniques to impart better environmental and economic properties to epoxy resins with smaller loading amounts.
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HU Yulong, ZHANG Ruqiang, LI Wenjun, YANG Ling, LONG Zhu
2025,42(6)
Abstract:
As an emerging green sustainable recycling material, biodegradable food packaging materials have been widely used in the field of food packaging because of their properties such as easy regeneration of raw materials, easy degradation after use, safety and harmlessness, etc. This article reviews food packaging materials prepared from different raw materials, as well as biodegradable food packaging materials with different functions developed to meet the diverse needs in the market. It also focused on the research progress, degradation mechanism and industrialization prospects of natural polymer (starch, cellulose, lignin, protein)-based food packaging materials and synthetic polymer (polylactic acid, polyvinyl alcohol)-based food packaging materials. Among them, natural polymer-based food packaging materials are rich in sources, harmless to the human body, and have the advantages of good formability and strong permeability resistance, while synthetic polymer-based food packaging materials have better transparency and mechanical properties, and both are naturally occurring in nature. All can be naturally degraded. Finally, it pointed out the challenges faced in the current research on biodegradable food packaging materials and that in future development, more emphasis should be placed on recycling and degradable comprehensive utilization, and more efforts should be made to prepare new biodegradable materials with excellent antibacterial, moisture-proof, breathable and other multi-functional properties. Degradable food packaging materials to meet different types of food packaging needs.
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GAO Bo-nan, YI Xiao-qian, ZHANG Ya-juan, ZHAO Qian, LIU Hong-li, WANG Shi-rong, LI Xiang-gao
2025,42(6)
Abstract:
E-paper display has become an important forefront display technology field, because it has the advantages of real time updating like electronic display device, energy saving and healthy for human like traditional paper. E-paper based on the electrophoretic principle of nanoparticles in microcapsules is the research focus of reflective display technology. In this paper, the electrophoretic display dispersion liquids were prepared by that nano-titanium dioxide and manganese ferrite black spinel particles were dispersed in Isopar L, and the microcapsules were prepared by the through complex coacervation reaction on the surface of the dispersion droplets with gelatin and arabic gum used as shell materials. The microcapsules with the high strength and monodispersity are obtained under the optimized conditions in the dispersion system composed of 5.0 g electrophoretic liquids, 100 mL gelatin-arabic gum solution and 0.2 g sodium dodecyl sulfate with an initial gelatin solution pH = 7. The reaction is carried out after the pH value of the dispersion system is adjusted to 4.7 after maintaining dispersion for 20 min, then the cross-linking reaction is operated through adding a moderate amount of glutaraldehyde into the system under the ice bath. The microcapsules have an average shell thickness of 283 nm and can maintain a good shape after drying at 80 ℃ for 30 min. The yield of microcapsules is 73%, of which 30-50 μm products for 47%. The prototype display device was prepared by coating a mixture of microcapsules and polyvinyl alcohol in a ratio of 15:1 (w/w), as well as glycerin as the plasticizer on the PET-ITO substrate, and the device exhibits that the white and black state is 17.9% and 3.5%, reflectivity, and a response time of 570.5 ms under a ±25 V electric field.
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WANG Ying-ying, ZHU Yi, WANG Peng-fei
2025,42(6)
Abstract:
Aiming to prepare industrial material of ZSM-5 zeolites with strong hydrophobicity, stable performance and adaptability to varied working conditions for adsorption and purification of volatile organic compounds (VOCs), high-silica ZSM-5 zeolites with different morphologies were synthesized by adding ammonium acetate in a hydrothermal system, using ZSM-5 zeolites with silicon to aluminum ratio of 300 as the seed crystal. The influence of ammonium acetate addition on morphologies and hydrophobicity of high-silica ZSM-5 zeolites were investigated by XRD, SEM, XRF, N2 adsorption-desorption and water contact angle characterization methods. The influence of morphologies on hydrophobicity and toluene adsorption performance of ZSM-5 zeolites were investigated on static and dynamic adsorption experimental device. The results show that high-silica ZSM-5 zeolites with coffin-shaped, hexagonal-plate and rod-shaped morphology can be obtained by adjusting the amount of substance ratio of ammonium acetate to be 0, 0.05 and 0.1 times of SiO2, respectively. Among them, the high-silica ZSM-5 zeolites with rod-shaped morphology (ZSM-5-0.1) had the strongest hydrophobicity with a hydrophobic index of 8.36 and a water contact angle of 35.05°. The water vapor and toluene adsorption of ZSM-5-0.1 were least affected by humidity: under relative humidity of 50%, 80% and 100%, the dynamic saturated adsorption capacity of water vapor is 0.66%, 0.92% and 1.15%, respectively; in addition, Under the humidity of 80%, the GHSV of 10000h-1, the breakthrough adsorption capacity of ZSM-5-0.1 for toluene at mass concentration of 4000 and 2000mg/m3 is basically equivalent with values of 0.053 and 0.051g/g, respectively, and the diffusion rate of toluene in ZSM-5-0.1 was least affected by water vapor, and its diffusion rate constants were 0.145 and 0.133 min-1, respectively, which were consistent with the Y-N model.
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WANG Yan-lei, YANG pan-pan, YANG jian-jun, WU qing-yun, WU ming-yuan, ZHANG jian-an, LIU jiu-yi
2025,42(6)
Abstract:
Phenolic compounds from natural plants have good antibacterial effect on drug-resistant bacteria. Syringic acid (SGA) is a typical representative of natural phenolic acids. In this paper, waterborne polyurethane films (SWPU) were prepared by quaternization reaction of isophorone diisocyanate (IPDI), polytetrahydrofuran glycol (PTMG) and 1mai 4-butanediol (BDO) with chain extender 3-dimethylamino-1-mino-2-propanediol (DMAD) and SGA. SWPU films were characterized by FTIR and 1H-NMR. The nano-size, DSC, mechanical properties, water contact angle and antibacterial properties of SWPU films were analyzed. The results showed that the glass transition temperature of SWPU-3 film prepared at n (DMAD): n (BDO) = 5:1 was -29.02 ℃, the water contact angle was 79.1 °, the tensile strength was 35.6MPa, the elongation at break was 987.7%, and showed more than 99.1% antibacterial activity against Escherichia coli and Staphylococcus aureus. The antibacterial zone experiments show that the antibacterial mechanism of the film is based on contact killing rather than the release of antibacterial components, and the sample film has environment-friendly characteristics.
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2025,42(6)
Abstract:
CM-LAP, P-LAP were prepared by chloroacetic acid method and sodium phosphate method, respectively. The viscosity, solubility, molecular weight, monosaccharide composition, and morphology were determined to explore their physicochemical properties, with verification by infrared and nuclear magnetic resonance. In vitro antioxidant experiments and evaluation of the protective effects against oxidative damage induced by H2O2 on HepG2 cells were conducted to assess the antioxidant activity of LAP, CM-LAP, and P-LAP. The results show that the modified polysaccharides showed reduced viscosity, increased solubility, unchanged monosaccharide composition but significant changes in monosaccharide molar ratios. Both crystalline and amorphous structures were observed for LAP, CM-LAP, and P-LAP, with alterations in surface morphology after modification, while the triple helix structure remained unchanged. Thermal stability was enhanced, with residual carbon rates at 550 ℃ recorded as 22.76%, 40.90%, and 30.38% for LAP, CM-LAP, and P-LAP, respectively. In addition, infrared and nuclear magnetic resonance spectroscopy confirmed the successful preparation of CM-LAP and P-LAP. The evaluation of their in vitro antioxidant activity showed that the modified polysaccharides enhanced LAP ability to DPPH and -OH scavenge free radicals. LAP, CM-LAP, and P-LAP were able to reduce the MDA levels induced by H2O2, with MDA levels decreasing from 6.768 nmol/mg protein to 4.029, 3.517, and 3.772 nmol/mg protein, respectively. Furthermore, they increased the activities of SOD and GSH-Px, with SOD activities increasing from 6.086 U/mg protein to 6.991, 7.474, and 7.192 U/mg protein, and GSH-Px activities increasing from 7.019 U/mg protein to 8.017, 8.591, and 8.227 U/mg protein. These results demonstrate that carboxymethylation and phosphorylation modifications can enhance the physicochemical properties and antioxidant activity of Lavandula angustifolia polysaccharides, highlighting their potential applications.
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Photocatalytic hydrogen production performance of Ni0.4Cu0.6/POM-CN for hydrolysis of ammonia borane
Li Rong, KANG Meng-qi, CHEN Xin-shun, FENG Jia-jia, XU Li-xin, WAN Chao
2025,42(6)
Abstract:
Carbon and nitrogen nanosheets (CN) were synthesized by the molten salt method using melamine as the precursor and lithium chloride as the templating agent, and the cyclic phosphonitrile-containing polymer carrier (POM) was synthesized by the solvothermal method using hexachlorotrisphosphononitrile and 2,6-diaminopyridine as the reactant, tetrahydrofuran as the solvent, and a certain amount of triethylamine was added to it, and the two were mixed to obtain the composite carrier with a two-dimensional laminar structure using the molten salt method and solvothermal method (POM-CN), and a series of NiCu/POM-CN catalysts were prepared by impregnation reduction method using POM-CN as the carrier. Based on TEM, SEM, XPS, XRD, FT-IR and UV-vis DRS characterization, the microstructures of the catalysts were analyzed, and the effects of the catalyst morphology and structure as well as photocatalysis on the hydrolysis performance of ammonia-borane (AB) for hydrogen production were investigated. The experimental results showed that under the irradiation of visible light, the TOF value of Ni0.4Cu0.6/POM-CN catalyst was as high as 1774.6 h-1, which was 2.8 times higher than that of the TOF value under the condition of no visible light (618.1 h-1), indicating that the catalyst had a good photocatalytic performance. Meanwhile, the catalyst still maintained a high catalytic activity after five cycle tests. In addition, the activation energy of the Ni0.4Cu0.6/POM-CN catalyst for the reaction in the presence of light was 52.75 kJ?mol-1. The characterization results indicated that the catalysts possessed excellent catalytic activity thanks to the POM-CN composite carrier, the alloying effect of the NiCu bimetal, and the strong interactions between the metal and the carrier.
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HU Cong-yi, LAN Yun-hong, XIAO Long-qiang, HOU Lin-xi
2025,42(6)
Abstract:
The ring-opening copolymerization reaction of epoxides with cyclic anhydride (ROCOP) plays a crucial role in the preparation of polyesters. In this thesis, the amino-modified metal-organic framework material UiO-66-NH2 was synthesized, and the ring-opening copolymerization of epoxide with cyclic anhydride catalyzed by the UiO-66-NH2/Lewis acid-base binary system was investigated. It was shown that the UiO-66-NH2/PPNCl catalytic system presented the best catalytic performance, and the ester bond content in the prepared polyester was up to 99.9%. Meanwhile, the effects of temperature, catalyst ratio and co-catalyst on the ring opening copolymerization reaction were investigated. The kinetic study showed that the reaction was a first-order kinetic reaction with an apparent activation energy Ea of about 66.51 kJ?mol-1. The cycling test proved that UiO-66-NH2 had good physical and chemical stability, and could be reused 3 times without decreasing the catalytic activity.
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JIN Mingyi, WU Jinyu, JIANG Rundong, ZHANG Genlin, XIU Zhilong, Dang Yanyan
2025,42(6)
Abstract:
Walnut green husk obtained by peeling green walnuts was used as raw material. A two-phase salt precipitation extraction method was employed to extract its active ingredients, sequentially using petroleum ether (PE), dichloromethane (DCM), ethyl acetate (EA), and n-butanol (n-BuOH) as solvents to obtain fraction 1 to fraction 4 through extraction and separation. Ultra high performance liquid chromatography quadrupole electrostatic field orbital trap mass spectrometer (UHPLC-Q-Exactive) was utilized to identify the compound compositions of the fractions. Antibacterial experiments against E. coli, S. aureus, and B. subtilis were conducted to investigate the influence of browning and non-browning of walnut green husk on the fractions and antibacterial activity of the extracts. Network pharmacology and molecular docking methods were employed to analyze the correlation between extract compositions and antibacterial activities, exploring the main antibacterial components and their mechanisms in walnut green husks. Results showed that the antibacterial activities of fraction 2 (DCM extract) and fraction 3 (EA extract) were insignificantly affected by browning of walnut green husk (P > 0.05), whereas the antibacterial activities of fraction 1 (PE extract) and fraction 4 (n-BuOH extract) were significantly affected by browning of walnut green husk (P < 0.05). Compared to non-browning walnut green husk, the antibacterial activities of fraction 1 decreased by 100%, 36.58%, and 39.53% against the tested bacteria, while those of fraction 4 increased by 128.49%, 53.32%, and 78.50%, respectively. The reduced antibacterial activity after browning of walnut green husk was correlated with decreased content of quinone compounds (2-hydroxy-1,4-benzoquinone, 2-hydroxy-1,4-naphthoquinone,1,4-naphthoquinone and hydroquinone), flavonoid compounds (quercetin pentaacetate, naringenin and isoquercetin), and steroid compounds (prsapogemin A and 3,5-dihydroxycholestan-6-one), whereas enhanced antibacterial activity was associated with increased content of quinone derivatives (tetrahydroxyquinone, menaquinone and compound d ) and alkaloids (minovincinine). Fraction 1 and fraction 4 mainly exert antibacterial effects through negative regulation of apoptosis processes, binding to the same proteins, and enzyme binding pathways.
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MA Xiao-qi, WANG Ke-xin, YU Xiao-shuai, XIN Guang, Wang Peng, XIAO Zhi-gang
2025,42(6)
Abstract:
In order to investigate the effect of linoleic acid (LOA) combined with rice glutenin (RG) on the molecular structure and physicochemical properties of extruded rice starch (ERS), ERS-RG-LOA with 10% RG addition (by mass of RS, hereinafter the same) and different LOA additions (by mass of RS, hereinafter the same) were prepared by a twin-screw extruder, with rice starch (RS), RG and LOA as the raw materials. ternary complexes, the effects of LOA addition on the molecular structure and physicochemical properties of ERS-RG-LOA ternary complexes were investigated based on the characterisation and testing by XRD, FTIR, low-field nuclear magnetic resonance (LF-NMR), DSC, rheometer, fast viscosity analyser, SEM, and laser particle sizer. The results showed that compared with ERS and ERS-RG prepared by adding RG only, the short-range ordered structure of ERS-RG-LOA ternary complexes was significantly increased by the addition of LOA, the relative crystallinity increased, the viscoelasticity, the thermal stability and the binding ability of water molecules were enhanced, the pasting temperature was increased, a denser microstructure was presented, and the peak viscosity was reduced. The relative crystallinity of ERS-RG-LOA ternary complex ERS-RG-1% was 14.54%±0.51%, the degree of short-range order (DO) was 0.971±0.005, the energy storage modulus was significantly higher, and the water-bound (1.77%±0.06%) and weakly-bound (4.39%±0.01%) water contents increased. content increased. The water absorption index (WAI) of the ERS-RG-LOA ternary complex did not change significantly compared to ERS-RG, but the water solubility index (WSI) was significantly lower.
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SUN Zhekai, ZHANG Zhihong, DU Xiaogang
2025,42(6)
Abstract:
Ce1Mn3 precursor was prepared by co precipitation method using cerium nitrate and manganese nitrate as raw materials, NaOH as precipitant. The composite metal oxide catalyst Ce1Mn3-x/γ-Al2O3 was prepared by mixing and calcining with nano alumina gel powder. X is the mass of Ce1Mn3 precursor powder (g), with values of 1, 3, 5, 7, and 9, and a total raw material mass of 10 g. The catalyst was characterized by XRD, BET and SEM, and its catalytic degradation performance on gaseous low concentration ethyl acetate (volume fraction 1000 ppm) was investigated by a fixed bed reactor. The effect of water vapor on the reaction and 48 hour catalytic stability were also explored. Compared with Ce1Mn3, the specific surface area of Ce1Mn3-x/γ-Al2O3 increases from 38.55 m2/g to 60.03~20.79 m2/g, and the number of mesopores significantly increases. Ce1Mn3 oxide is bound to the surface of γ-Al2O3, and the exposed Ce1Mn3 oxide particles have a finer and more dispersed morphology. When the mass ratio of Ce1Mn3 to alumina sol dry powder is 7:3, Ce1Mn3-7/γ-Al2O3 has the highest catalytic activity. Under the condition of space velocity (GHSV) of 15000 mL/(g·h), the degradation rate of ethyl acetate reaches 90% at 164 ℃ (T90). Both the carrier γ-Al2O3 and the addition of water vapor are beneficial for the degradation of ethyl acetate at low temperatures (<120 ℃), promoting the generation of degradation intermediates acetic acid and ethanol, resulting in a decrease in the final T90. In a reaction atmosphere test at 180 ℃ for 48 hours without water vapor, the Ce1Mn3-7/γ-Al2O3 catalyst can consistently maintain a degradation rate of over 99% for ethyl acetate.
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LU Yue-jing, LAI Xiao-juan, SHI Hua-qiang, LI Hai-bin, CHEN Jia-li, WANG Lei, DANG Zhi-qiang
2025,42(6)
Abstract:
Carrying agents in solid acid systems are susceptible to dilution by formation water during transport to the formation, resulting in poor acidification of solid acids. Based on this, in this paper, a hydrophobic associative thickener (PAAOD) with dilution resistance was prepared by aqueous solution polymerization using acrylamide (AM), 2-Acrylamido-2-methylpropane sulfonic acid (AMPS), methylacryloxyethyl trimethyl ammonium chloride (DMC) and octylpolyoxyethylene ether methacrylate (OEMA). as raw materials. The structure of PAAOD was characterized using Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance hydrogen spectroscopy (1H NMR). The dilution resistance, shear resistance and retardation properties of PAAOD were investigated by means of performance tests such as apparent viscosity, rheology and acid rock reaction rate. The results of the study show that: The monomers were all involved in the polymerization and the PAAOD polymerization was successful. The apparent viscosity of 0.8 wt% PAAOD was maintained at 63.39 mPa·s after shearing for 2 h at 130°C and a shear rate of 170 s-1, showing good temperature and shear resistance; The PAAOD solution was subjected to dilution resistance experiments, and the rate of viscosity loss was 43.75 % for twofold dilution at room temperature (25°C) and 44.80 % for twofold dilution at high temperature (90°C), which showed good resistance to dilution, and after standing for a certain period of time, the loss of viscosity of PAAOD was reduced with a certain degree of restorative properties; The acid rock reaction rate of PAAOD at 130°C was 0.06 mg/(cm2·s), which proved that the polymer had good retardation properties. Therefore, thickening agent PAAOD has good application prospects in deep and ultra-deep wells.
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DONG Zilong, YU Xiaolong, CHEN Zeyuan, ZHAO Pujie, WANG Fang, ZHU Xinbao
2025,42(6)
Abstract:
A trifunctional epoxy resin, N-phenyl-p-phenylenediamine triglycidylamine (ADPTGA), was synthesized by a two-step process using N-phenyl-p-phenylenediamine (ADPA) and epichlorohydrin (ECH) as raw materials, and benzyltriethylammonium chloride (TEBAC) as a catalyst.The structural composition of ADPTGA was characterized by FTIR and 1HNMR. ADPTGA was added to bisphenol A epoxy resin (E-51) and cured with diaminodiphenylmethane (DDM) as the curing agent to investigate the effect of ADPTGA addition (calculated by E-51 quality, hereinafter) on the performance of the composite epoxy resin system based on the viscosity determination, storage stability test, mechanical property test, TGA, SEM and other tests. The curing kinetics of E-51/DDM (phr) and ADPTGA/E-51/DDM systems were analyzed by non-isothermal DSC tests. The results showed that the epoxy value of ADPTGA was 0.68 mol/100 g, and the viscosity was 5~6 Pa·s at 25 ℃. When the ADPTGA was added at 10%, the cured product (10 phr) of ADPTGA/E-51/DDM system had the best performance, and its tensile strength, elongation at break, flexural strength, and impact strength were increased by 45.8%, 54.5%，22.8% and 41.2%, respectively, compared with that of phr , and the glass transition temperature (Tg) increased by 5.5 ℃; the results of the curing process of phr and 10 phr were in accordance with the two-parameter autocatalytic (?esták-Berggren) model, and the curing process was unaffected by the rate of temperature increase (5~20 ℃/min).
