Abstract:Metal-organic frame material (MOFs) is a kind of crystalline porous material with periodic network structure, which is connected by metal nodes and organic ligands through self-assembly. It is widely used in various fields because of its high specific surface area, high porosity and modifiability. However, zero-dimensional, one-dimensional and three-dimensional materials usually have problems such as fewer active sites and insufficient contact area between pollutants and MOFs, for which two-dimensional MOFs-based materials provide solutions and shine in the field of removing environmental pollutants. In this paper, the application progress of two-dimensional MOFs-based materials in the removal of environmental pollutants in the past five years is reviewed, including the preparation method of two-dimensional nanosheet MOFs, the main mechanism of removal of pollutants and the types of pollutants. It is pointed out that MOFs are beneficial to adsorb or catalyze environmental pollutants, and on this basis, a compound or derivative strategy can significantly improve the removal efficiency, and revealed the mechanism of interaction between MOFs and pollutants from the perspective of theoretical calculation. Finally, the modification strategy, interaction mechanism and systematic theoretical guidance of MOFs are summarized and prospected.

Abstract:In the face of increasing global energy consumption and increasingly severe environmental problems, it is particularly urgent to promote the implementation of "dual carbon" strategy. Promoting the sustainable development of the industry through the implementation of this strategy is essential to address these challenges. The rational use of abundant and environmentally friendly biomass resources is key to promoting the transformation and upgrading of traditional insulation materials. Biomass aerogel is a new type of porous material, which not only shows excellent properties comparable to traditional aerogel, such as low density, high porosity and high specific surface area, but also has a broad development prospect in insulation applications due to its unique advantages of renewable raw materials and “carbon sequestration”. This article focuses on the preparation methods and classification of biomass aerogel, and elaborates on the thermal insulation applications of biomass aerogel composite materials in the fields of construction, automotive industry, packaging, and desalination. Finally, the challenges faced by biomass aerogel are put forward: to meet the requirements of economic, environmental protection and high efficiency preparation; To meet the needs of use in different application fields; The application prospect of biomass aerogel thermal insulation composites should be broadened. At the same time, the future research is prospected: design a green recyclable experimental system and simplify the process flow; Optimize the preparation process and develop functional materials adapted to specific applications; Research and develop other biomass materials, and explore new application fields.

Abstract:Perovskite solar cell technology is a key development direction for the next generation of solar cell technology due to its advantages of solution-processing, low cost and high theoretical efficiency. Long-term stability and large-scale production have become the biggest obstacles to the commercialization of perovskite solar cells. Carbon nanomaterials are ideal for improving device efficiency and stability due to their high electron mobility, tunable Fermi energy levels, and excellent stability. This paper summarizes the research progress of four typical carbon nanomaterials, including graphene, carbon nanotubes and fullerenes as electron transport materials in the application of perovskite solar cells. The mechanisms involved in several carbon nanomaterials for enhancing the efficiency and stability of perovskite solar cell devices are analyzed. Finally, the development prospect of carbon nanomaterials in the field of perovskite solar cells is outlooked, and it is believed that the future application of carbon nanomaterials can be focused on the rational structural modification of carbon nanomaterials in order to develop new carbon nanomaterials that are low-cost, solvent-processable, and rich in photovoltaic properties.

Abstract:With the development of industry, more and more emerging organic pollutants are entering the water environment, posing a threat to human health and the ecological environment. The traditional advanced oxidation technology of persulfate has the problems of high application cost and ecotoxicity of residues, and finding new low-cost and environmentally friendly alternatives has become a new research direction. Sulfite itself is an industrial by-product that is considered a good alternative to persulfate due to its low cost and more environmentally friendly advantages. This paper reviews the research progress of activated sulfites in recent years from the perspective of homogeneous and non-homogeneous phases, summarizes the advantages and disadvantages of different activation modes, summarizes the application of sulfites in the treatment of emerging organic pollutants in water as well as the main factors influencing them, and points out the knowledge gaps in the existing research on the mechanism of co-oxidation between inorganic and organic pollutants and the pathway of organic pollutant degradation, and the homogeneous and non-homogeneous activation materials in practical applications. Looking forward, the research will focus on the development of new trends of non-homogeneous activation materials, practical wastewater treatment and exploration of organic pollutant degradation pathways to provide theoretical support for the application of sulfite in the field of water treatment.

Abstract:Acetylated xylans with degree of substitution (DS) of 0~0.34 were prepared by acetic anhydride/DMAP/LiCl homogeneous system. The acetylated xylans were used as dispersants to disperse multi-walled carbon nanotubes (MWCNT), and the MWCNT dispersions were coated on paper surface to fabricate paper-based conductive materials. The effects of DS on the MWCNT dispersing performance of xylans and the electrochemical performance of paper-based conductive materials were evaluated. The results show that when DS = 0.296, the acetylated xylan has the best performance in dispersing MWCNT, the dispersion efficiency reaches 64.4%, and the particle size is the smallest. When the DS of acetylated xylan is larger or smaller than 0.296, the dispersion efficiency decreases and the particle size of the dispersion increases, which is attributed to the balanced hydrophilic and hydrophobic properties of acetylated xylan with DS = 0.296 to achieve the effective dispersion of MWCNT. The paper-based conductive materials prepared by acetylated xylan/MWCNT dispersion coating have good electrochemical performance, with a conductivity of 17.89 S/m and a capacitance retention of 50% after 1000 cycles. The results of this work show that acetylated xylan has the potential to be used as a green dispersant to efficiently disperse MWCNT for the preparation of functional materials.

Abstract:To inhibit bacterial corrosion on leather artifacts and extend their storage lifespan, C-TiO2 nfs were synthesized from nano-TiO2, KH560, and M2070; I-TiO2 nfs were prepared using nano-TiO2, DC5700, and NPES. These TiO2 nfs were both applied to aging leather using a cyclic brushing method.The structural composition, microscopic morphology, and fluidity of the TiO2 nfs were characterized using FTIR, TEM, and rheometer. The aging leather before and after TiO2 nfs treated were analyzed using digital camera, spectrophotometer, SEM, etc. to evaluate changes in color and structure. Additionally, the mechanical properties, UV resistance, antibacterial performance, and long-term stability of the treated leather were tested using servo material multifunctional high/low-temperature control testing machine, UV-visible-near-infrared spectrophotometer , etc. .The results showed that C-TiO2 nfs and I-TiO2 nfs are both white liquids with good fluidity at room temperature, and C-TiO2 nfs exhibiting better fluidity. After treated by TiO2 nfs, the color and structure of the aging leather remained unchanged, and its mechanical properties, UV resistance, and antibacterial performance improved significantly, demonstrating long-term stability. C-TiO2 nfs treated aging leather achieved inhibition rates of 61.3% and 69.9% against E. coli and S. aureus, respectively. I-TiO2 nfs treated leather exhibited superior softness, mechanical properties, and antibacterial performance, with softness, tensile strength, and elongation at break reaching 3.32 mm, 17.32 MPa, and 81.71%, respectively. The inhibition rates against E. coli and S. aureus achieved 97.0% and 98.2%, respectively.

Abstract:Developing low-cost, efficient, and stable non-precious metal hydrogen evolution materials is of great significance for industrial hydrogen production. The spherical Ni-Mo-RE(Eu, Tb, Gd) rare earth composite electrocatalyst was constructed on copper sheet (Cu) by a simple electrodeposition method. The catalyst showed high hydrogen evolution (HER) activity under alkaline conditions. SEM, EDS, XPS, TEM and other characterization methods showed that the deposition voltage and rare earth species affected the morphology of the materials. The addition of Eu made the materials form spherical particles with uniform size and a large number of pores, which greatly increased the active sites and improved the catalytic efficiency. The electrochemical test results show that Ni-Mo-Eu has a maximum electrocatalytic active area of 1475, and exhibits high hydrogen evolution activity at HER overpotential (η10) of only 45mV and charge transfer resistance (Rct) of 0.2497Ω.cmIn addition, after 1000 cycles of voltammetry and 100h continuous electrolysis, the electrode showed good stability and durability. These excellent electrocatalytic hydrogen evolution properties indicate that the material has great development potential in practical industrial hydrogen production.

Abstract:In order to improve the conductivity of medical dressing to wound transudate, lotus fibers/polyvinylpyrrolidone (PVP) nano-medical dressing was prepared by electrospinning technology using lotus fibers with excellent hygroscopicity and water transport performance, and compared with pure PVP nano-medical dressing. The properties and structures were characterized by testing strength, water vapor permeability rate, SEM and contact angle, etc. The results showed that the fibers of the prepared lotus fibers-based nano-medical dressing were evenly distributed and there were no beads on the surfaces. At the same time, the dressing had an interconnected porous structure, and the smaller the fibers diameters, the higher the porosity (up to 72.39%); When the content of lotus fibers was 5.5%, the liquid absorption rate of medical dressing was 487.02% and the contact angle was reduced to 32.6°, showing that ultra-wettability was achieved; The water vapor permeability rate could reach 2396.38 g/ (m2·24 h), indicating that the dressing had superconductivity to wound transudate. Besides, the dressing had antibacterial effect on Staphylococcus aureus, which provided a theoretical and practical basis for improving the performance of the new medical dressing.

Abstract:In order to improve the compatibility and dispersion of nano-CaCO3 with organic matrix, and enhance the application of styrene-butadiene-styrene block copolymer (SBS) and nano-CaCO3 in modified asphalt, CaCO3-NH2 was prepared by amination modification of nano-CaCO3, ESBS was prepared by epoxidation treatment, and then CaCO3-NH2 and ESBS were covalently grafted by surface grafting method, SBS grafted nano-CaCO3 (SBS-g-CaCO3) with organic-inorganic hybrid cross-linked structure was prepared. Taking grafting ratio, contact angle and swelling index as key indicators, the preparation conditions of SBS-g-CaCO3 were optimized by orthogonal experiments, and the surface morphology, structure and luminescence properties of SBS-g-CaCO3 were characterized and tested by FTIR, XPS, SEM, TGA and fluorescence microscopy. SBS-g-CaCO3 was used in modified asphalt, and its performance was tested and compared with that of CaCO3-NH2 and ESBS mechanically blended modified asphalt. The optimal reaction conditions were as follows: n (epoxy): n (amino) = 1: 1, reaction temperature 70 ℃, reaction time 210 min, 0.25 mol/L NaOH aqueous solution content 1 mL, in which n (epoxy): n (amino) had the greatest influence on the key indexes. Compared with ESBS, SBS-g-CaCO3 has better thermal stability, and the grafting rate can reach up to 49.5%; Nano-CaCO3 particles are uniformly dispersed in SBS and form cross-linked interpenetrating network structure with SBS; The storage stability of SBS-g-CaCO3 modified asphalt is obviously improved, and the softening point difference at 48 h is 0.5 ℃.

Abstract:Chloropropyl triethoxysilane (CPTES) was used as end-group modifier to prepare chloro-terminated SiO2 (CTNS), and melamine (MA) was introduced as a corrosion inhibitor, and further modified by covalent bond to CTNS surface to prepare melamine modified nano-silica (MCTNS) composite. The successful synthesis of MCTNS composites was characterized by FTIR, XPS and thermogravimetric tests. The waterborne epoxy composite coating was prepared by blending the composite material with water-based epoxy resin. The anti-corrosion properties of the coating were investigated by electrochemical analysis and salt spray test. The physical properties of the coating were analyzed by impact test and adhesion test. The results show that the coating with 1.0% MCTNS has excellent physical properties (adhesion grade 0, hardness 3H, impact resistance 45 Kg·cm, water absorption 4.28%). Compared with the pure waterborne epoxy resin (WEP) coating, the corrosion current density decreases from 9.13×10-5A·cm-2 to 8.13×10-6 A·cm-2, the corrosion potential increases from -0.597V to -0.248V, the corrosion inhibition efficiency reaches 97.5%, and the coating remains smooth and complete after 30 days of salt spray test.

Abstract:Firstly, vanillin oxime (VO) was synthesized from vanillin and hydroxylamine hydrochloride. Then anionic vanilla oxime self-repairing waterborne polyurethane (VO-SWPU) was prepared by polymerization with polytetrahydrofuran (PTMEG) and isophorone diisocyanate (IPDI) using VO as alcohol extender and 2-dimethylol propionic acid (DMPA) as hydrophilic extender. VO-SWPU film was prepared. The structure of VO was characterized by FTIR and 1HNMR, and the thermal properties of VO-SWPU films were tested by DSC and TGA. Based on self-healing experiments and tensile tests, the effects of isocyanate index (R) and n (PTMEG) / n (VO) on the self-healing ability and mechanical properties of VO-SWPU films were investigated. The results show that the addition of VO has no significant effect on the thermal degradation process of VO-SWPU thin films, and the T5% (temperature of weight loss 5%) of all samples is above 210C. The scratches of SWPU-1 films prepared by R=1.2 ,n(PTMEG) / n (VO) = 2.5 disappear completely after being repaired at 45 ℃ for 40 min. After the SWPU-1 film and SWPU-3 film prepared by n (PTMEG) / n (VO) = 2.5 healed at 60 ℃ for 2 h, the tensile strength of the self-repaired SWPU-1 film and SWPU-3 film was 13.23 and 19.12 MPa, respectively, and the self-repair efficiency was 96.5% and 82.2%, respectively.

Abstract:To realize the reduction, harmlessness and recycling of the municipal sludge, nZVZ-MSBC/PVA gel bead was prepared by skeletal deposition of nano-zero-valent zinc (nZVZ) into municipal sludge biochar (MSBC) followed recombining with polyvinyl alcohol (PVA) using Ca2+ as cross-linking agent. And it was used to adsorb phosphate from water. It could not only efficiently adsorb phosphate, but also facilitate post-adsorption separation from water. The micromorphology and structural composition the nZVZ-MSBC/PVA beads were characterized using SEM, BET, FTIR, and XPS. The influence of m(nZVZ-MSBC)∶m(PVA) for phosphate adsorption performance of nZVZ-MSBC/PVA beads was investigated. The kinetics and thermodynamic properties were explored. In addition, the adsorption mechanism was speculated. The results showed that nZVZ-MSBC/PVA beads [nZ-C/PVA(1∶1)] prepared with m(nZVZ-MSBC)∶m(PVA)＝1∶1 exhibited the optimal phosphate adsorption performance for phosphate solution at pH=5. And the beads presented three-dimensional porous structure. The adsorption of phosphate by nZ-C/PVA(1∶1) beads was an endothermic process. And it was fitted Pseudo-second-order dynamics and Langmuir models. The maximum adsorption amount could reach 274.30 mg/g at 318 K. The adsorption process was dominated by monolayer chemisorption. The adsorption mechanism included electrostatic interaction, hydrogen bonding, surface deposition, complexation and so on.

Abstract:Mn2+-doped (relative doping amount x, the same below) and reduced graphene oxide (rGO)-coated polyanionic sodium-ion battery cathode materials Na4Fe3-xMnx(PO4)2(P2O7)/rGO (Mnx-NFPP/rGO) was prepared by the sol-gel method using FeSO4·7H2O, MnSO4·H2O, NH4H2PO4, CH3COONa, citric acid monohydrate, and graphene oxide (GO) as raw materials. The microstructure and composition of Mnx-NFPP/rGO were characterized by SEM, XRD, EDS, and XPS. The influence of the relative Mn2+ doping amount x on the electrochemical performance of Mnx-NFPP/rGO was investigated based on galvanostatic charge-discharge, cyclic voltammetry, and electrochemical impedance tests. Density functional theory (DFT) was employed to calculate the energy bands and density of states of Mnx-NFPP/rGO. The results showed that Mn2+ doping expanded the Na+ diffusion channels and enhanced the Na+ diffusion rate, but had no effect on the three-dimensional structure and morphology of the material. Mn0.3-NFPP/rGO with a relative Mn2+ doping amount of 0.3 exhibited the best cycle stability and rate performance, with an initial discharge specific capacity of 131.2 mA·h/g at a rate of 0.05 C and a charge-discharge specific capacity of 91.9 mA·h/g at a rate of 2 C. Mn2+ doping and rGO coating effectively improved the discharge specific capacity and cycle stability of the material, with a specific capacity retention rate of 94% after 100 cycles at a rate of 1 C. Mn2+ doping reduced the band gap (3.128 eV) between the valence band and conduction band of the material, making it easier for electrons in the valence band to transition to the conduction band, thereby improving the Na+ diffusion kinetics and intrinsic conductivity.

Abstract:To enhance the structural stability of MnO2 materials and address issues such as the solubility of Mn2+ and poor conductivity, NaH2PO2·H2O was utilized as a phosphorus source, while nickel foam (NF) served as the current collector. A self-supporting phosphorous-doped MnO2 nanomaterial was successfully synthesized on the NF substrate through a one-step hydrothermal method using KMnO4 and MnSO4·H2O. The morphology, structure, and composition of the resulting material were characterized by SEM, TEM, XRD, and XPS techniques. The electrochemical performance of phosphorus-doped MnO2 was evaluated using a three-electrode system, focusing on the impact of varying amounts of NaH2PO2·H2O additive on the capacitance properties of the phosphorus-doped MnO2 electrode. The results indicate that NaH2PO2·H2O was successfully synthesized with mass additions of 0.017 g, 0.051 g, and 0.085 g to produce three types of phosphorus-doped MnO2: P0.017-MnO2, P0.051-MnO2, and P0.085-MnO2. When the scan rate increased from 5 mV/s to 50 mV/s, all three phosphorus-doped MnO2 electrodes exhibited good electrochemical reversibility. Notably, the P0.051-MnO2 electrode demonstrated the longest discharge time (232 s) and optimal capacitance performance; this may be attributed to its larger specific surface area (236.6864 m2/g) and nanoparticle structure. At a mass current density of 1 A/g, the mass specific capacitance of P0.051-MnO2 electrode is 342 F/g, which is better than that of MnO2 electrode (90 F/g), P0.017-MnO2 electrode (217 F/g) and P0.085-MnO2 electrode (169 F/g). When the mass current density is increased to 10 A/g, the specific capacitance of P0.051-MnO2 electrode is 262.3 F/g, and the capacity retention rate is 76.7%. The capacity retention rate of P0.051-MnO2 electrode was 94.3% after 2000 cycles. The P0.051-MnO2 electrode has a smaller system ohm resistance (about 0.9 Ω) and diffusion resistance (about 0.2Ω) in electrochemical impedance (EIS) testing. When the scanning rate is 50 mV/s, the capacitance contribution rate of P0.051-MnO2 electrode is 87%, which is higher than that of MnO2 electrode 71%. Phosphorus doping can effectively enhance the charge transfer ability of MnO2, generate more active sites, and improve its capacitive performance.

Abstract:This study extracted polysaccharides from the fruits of PEP. Following purification, phosphoric acid sodium method was employed to synthesize P-PEP. The optimization of the phosphorylation modification process of PEP was conducted using single-factor experiments and response surface methodology. Comprehensive characterization of the physicochemical properties and structures of the polysaccharides before and after modification was performed using modern techniques such as spectroscopy, chromatography, XRD, SEM, thermogravimetric analysis and NMR. Furthermore, the radical scavenging ability and hypoglycemic activity were evaluated for both modified and unmodified polysaccharides. The results indicated that the optimal phosphorylation modification conditions were: temperature 72 °C, pH 9.0, and time 5.1 h, resulting in a degree of substitution of 11.372%. The molecular weights of PEP and P-PEP were determined to be 20 898 Da and 21 432 Da, respectively, both primarily composed of Rha, Ara, Gal, and Glu, with significant changes observed in the molar ratios of monosaccharides before and after modification. The crystallinity of the polysaccharide decreased after modification, and surface morphology changed, while thermal stability improved, with a residual carbon rate of 21.27% and 48.35% at 600 °C, respectively. The infrared spectrum exhibited characteristic absorption peaks of phosphate groups at 1090 cm-1 and 950 cm-1, and 1H NMR spectra displayed absorption peaks at δ=5.70 ppm and 3.72 ppm, while 31P NMR peaks at 2.49 ppm, -6.23 ppm, and -7.03 ppm confirmed successful phosphorylation modification. The IC50 values for PEP and P-PEP against DPPH were 0.93 mg/mL and 0.60 mg/mL, respectively, while against ABTS were 1.05 mg/mL and 0.67 mg/mL, and for α-glucosidase were 3.46 mg/mL and 1.43 mg/mL, respectively. The IC50 values against α-amylase for PEP and P-PEP were 3.81 mg/mL and 0.49 mg/mL, respectively. These findings suggest that phosphorylation modification not only improved the physicochemical properties of the polysaccharides but also enhanced their radical scavenging capacity and hypoglycemic activity.

Abstract:The material basis of anti-tumor effect of BuddleJa officinalis was studied by a variety of experiments. Firstly, the anti-tumor activity of four different solvent extracts ( ethyl acetate extract, n-butanol extract, petroleum ether extract, water extract ) of BuddleJa officinalis was screened by CCK-8. Secondly, the chemical constituents of the extracts with antitumor activity were isolated and purified based on Silica gel column chromatography, Thin layer chromatography and High performance liquid chromatography, and their structures were identified by MS, NMR ,IR and UV. Then, The effects of the isolated compounds on the proliferation and apoptosis of tumor cells ( human breast cancer cell MCF-7, human gastric cancer cell SGC-7901, human liver cancer cell BEL-7404 ) in vitro were detected by CCK-8 assay and Annexin V-FITC / PI staining assay. Finally, the effect of monomeric compounds on the activity of DNA Topoisomerase I and the direct cleavage of DNA were detected in a cell-free system. The results showed that the extracts of four different solvents of BuddleJa officinalis could inhibit the proliferation of tumor cells to a certain extent, and four monomer compounds of Apigenin, Linarin, Verbascoside and Apigenin-7-glucuronide were isolated from that. The four monomeric compounds have anti-tumor activity against three tumor cells and can inhibit DNA Topo I and unwinding DNA. Compared with other monomeric compounds, Apigenin can significantly inhibit the proliferation of BEL-7404 tumor cells, and Apigenin-7-glucuronide is more effective in promoting apoptosis. Therefore, the four monomer compounds may be the main anti-tumor active ingredients of BuddleJa officinalis.

Abstract:The composite catalysts of graphene oxide supported tungstate and bismuth molybdate (WO3-Bi2MoO6@GO) were prepared by hydrothermal-annealing method. The structure, surface morphology and specific surface area of the as-prepared catalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), electron scanning microscopy (SEM) and N2 isothermal adsorption and desorption. The simulated oil desulfurization performance of the WO3-Bi2MoO6@GO was tested under different reaction temperature, light source, catalyst dosage, extractant dosage, oxygen to sulfur ratio, and other conditions. The results showed that the desulfurization rate of 200 and 500mg/L simulated oil reached 99.0% with reaction temperature of 40℃, the catalyst dose of 0.02g, the volume of acetonitrile of 5mL, the volume of H2O2 of 0.12mL and the reaction time of 75min.

Abstract:In this study, Co-TiO2 was obtained by mixing and stirring cobalt nitrate hexahydrate, F127, tetrabutyl titanate, hydrochloric acid, acetic acid, and tetrahydrofuran, calcined after low-temperature drying, and then 2CoP-TiO2 catalyst was subsequently prepared by low-temperature phosphorylation under nitrogen atmosphere. The effects of various factors on the performance of 2CoP-TiO2 photocatalytic AB hydrolysis for hydrogen production were explored, and the microstructure of the catalyst was characterized in detail. The experimental results showed that the 2CoP-TiO2 catalyst catalyzed the hydrolysis of AB to hydrogen with a TOF value of 38.7 min-1 and an activa-tion energy of 46.4 kJ·mol-1 under visible light irradiation when the reaction temperature was 298 K. The intro-duction of the P component induced a decrease in the bandgap energy and an increase in the electron mobility rate, which promoted the photocatalytic reaction. The reaction time of catalyzed AB hydrolysis for hydrogen production did not increase significantly after the catalyst was tested for five cycles, indicating that the 2CoP-TiO2 catalyst has good cycling stability.

Abstract:Nitrogen-doped carbon support (N-C) was synthesized using glucose as a carbon source and thiourea as a nitrogen source. The doped nitrogen atoms were then used as active sites to interact with palladium nanoparticles (Pd NPs), resulting in Pd/N-C catalyst. This catalyst was then employed for the dehydrogenative coupling reaction of silane with alcohol. The catalyst was characterized using XRD, XPS, SEM, TEM, ICP-OES, and GC-MS. The characterization results indicated that the Pd NPs were uniformly dispersed on the support with a particle size of (4.87±1.10) nm. The interaction between N in the N-C support and Pd NPs effectively dispersed and stabilized the Pd NPs. Compared to the Pd/C catalyst, the N-C support exhibited a significant promotional effect on the catalytic performance of the Pd catalyst. The Pd/N-C catalyst achieved a diphenylsilane conversion and diphenyldimethoxysilane selectivity of over 99% after 1 h for the dehydrogenative coupling reaction of diphenylsilane with methanol. Cycling experiments demonstrated that the catalyst retained a conversion rate of over 92% after six cycles, and the final product, diphenyldimethoxysilane, achieved a selectivity of over 99%. Experiments with different silane and alcohol substrates showed that the Pd/N-C catalyst exhibited excellent catalytic performance and substrate versatility.

Abstract:During transportation and storage, potato tubers are prone to greening, which severely affects product quality and causes significant economic losses, thereby hindering the sustainable development of the potato industry. To suppress potato tuber greening, this study prepared a sodium alginate-erythrosine (SA-ERY) composite film using erythrosine (ERY) and sodium alginate (SA) as raw materials, with glycerol (Gly) as a plasticizer, and optimized the reaction conditions through single-factor experiments. The effects of reaction conditions on the physical properties, mechanical performance, and optical characteristics of the SA-ERY composite film were investigated using SEM, TGA, UV-Vis, and mechanical tests, as well as its influence on water vapor, oxygen, and carbon dioxide barrier properties. Additionally, the inhibitory effect of the SA-ERY composite film on potato tuber greening was evaluated through light exposure experiments. The results showed that when the addition amounts of SA, glycerol (Gly), and ERY were 2.0%, 0.6%, and 0.1% (based on the total mass of the SA-ERY composite solution), respectively, the SA-ERY composite film exhibited optimal mechanical properties. ERY and SA molecules primarily interacted through hydrogen bonding and electrostatic interactions. When the ERY content reached 0.4%, the crystallinity and thermal stability of the composite film were significantly improved. The SA-ERY composite film displayed a U-shaped absorption curve in the 450–550 nm wavelength range, demonstrating selective blue-light-blocking properties. After 3 days of storage, the chlorophyll content in potato tubers treated with the SA-ERY composite film increased significantly compared to day 0 (P < 0.05), but was 25.59% and 31.28% lower than that of the SA-treated group and the control group, respectively. This confirms that the mechanism of action involves effectively inhibiting greening by blocking blue light.

Abstract:Nano-Fe3O4 was loaded on globular MoS2 by hydrothermal method to prepare globular Fe3O4/MoS2 composite catalyst. Fe3O4/MoS2 was characterized by SEM, XRD, XPS and VSM, and the removal performance of ciprofloxacin (CIP) by flower globular Fe3O4/MoS2 activated persulfate (PMS) was investigated. The effects of different systems, pH, Fe3O4/MoS2 dosage, PMS dosage, initial CIP concentration, common anions and humic acid on CIP removal in Fe3O4/MoS2/PMS system were investigated, and the cycle stability of flower ball Fe3O4/MoS2 composite catalyst was investigated. The results show that under the conditions of 30℃, 0.2 g/L catalyst dosage,0.25g / L PMS dosage and 5 mg/L CIP concentration, the removal rate of CIP can reach 96.1% within 20 min, and the system still has a high removal rate in a wide range of pH (3.0~9.0). After three cycles, the catalyst can still remove 90.27% of CIP. Free radical quenching test and EPR test showed that the mechanism of CIP removal by Fe3O4/MoS2 activated PMS included free radical pathway (?SO4- and ?OH) and non-free radical pathway (1O2), and the main active substance was 1O2. This study provides some theoretical basis and technical support for activating PMS to treat antibiotics in water.

Abstract:A silicon-containing phosphonitrile flame retardant (SCP-DOPO) was synthesized from hexachlorotrisphosphonitrile, p-hydroxybenzaldehyde, p-aminobenzoic acid, 9, 10-dihydro-9-oxa-10-phosphame-10-oxide (DOPO) and triphenylsilanol. The structures were characterized by FTIR, 1HNMR and 31PNMR, and the effects of SCP-DOPO dosage on the bond performance, thermal stability and flame retardancy of epoxy resin were also investigated. The results showed that the peel strength of the modified epoxy resin was 3.06 kN/m and 2.64 kN/m, respectively, when the dosage of SCP-DOPO was 4% and 8%, which was superior to that of the pure epoxy resin. When the addition of SCP-DOPO was 8% and 12%, the degree of graphitization of the modified epoxy resin corresponding to the residual carbon was increased, and the vertical combustion (UL-94) test was V-0 grade, and the limiting oxygen index (LOI) reached 31.1% and 31.6%, respectively. The Raman test results further showed that it has good charring properties, so the modified epoxy resin has excellent flame retardant properties.

Abstract:To understand the structure-function relationship between the molecular structure of organosilicon surfactants and surface tension, interfacial tension, emulsification, wettability and hydrolysis resistance, three polyether-modified organosilicon surfactants were designed and synthesized through combining the heptamethyltrisiloxane with allyl polyethers. The optimum synthesis conditions were determined by the response surface methodology. The surface and interfacial tension, emulsification, wettability and hydrolytic stability were evaluated. Moreover, the structure-function relationship of these organosilicon surfactants was elucidated. It is proposed that the hydrophilicity, molecular volume/cross-sectional area of surfactants stacked at interface, and polarity of the tail end within polyether chain are the main factors affecting the surface/interface tension, emulsification and hydrolytic stability, and wettability, respectively. Finally, APAEE-MDHM-ATS with the best hydrolysis resistance was employed as a clean-up additive in the fracturing fluid to study the compatibility with guanidine fracturing fluid and cleanup performance of drainage. It is found that APAEE-MDHM-ATS of 0.3wt.% shows a good compatibility, associated with a viscosity of 2.8 mPa?s, surface tension of 22.4 mN/m, and a cleanup additive efficiency of 45% after gel breaking.

Abstract:The poor water solubility of the reactant 2,4,5-triamino-6-hydroxypyrimidine sulfate in the folic acid synthesis process is the main reason for the large water consumption and many side reactions during the reaction.The reaction of 2,4,5-triamino-6-hydroxypyrimidine sulfate with the same amount of potassium carbonate was pretreated and then used in the synthesis process of folic acid, which could effectively improve its water solubility.And further investigate the conditions such as the type of alkali, the reaction temperature, the reaction time, the proportion of reactants, the phase transfer catalyst, the type of acid, and the pH of the alkali refining solution.The results show that when n(N-p-aminobenzoyl-L-glutamic acid):n(2,4,5-Triamino-6-hydroxypyrimidine sulfate):n(potassium carbonate):n(trichloroacetone) =1.0:1.2:1.2:2.6.Under the action of tetrabutylammonium bromide, the reaction temperature is 40 ℃, the reaction time is 2.5-2.8 for 3 h, and then the reaction time is 3 h at pH 3.2-3.5. The yield of folic acid is 82.22%, and the purity is 72.81%.After acid purification with hydrochloric acid and alkali purification at pH 8.5, folic acid product with yield of 66.35% and purity of 97.69% was finally obtained. Compared with the original process, the yield increased by 5.59%, and the water consumption decreased by 33%.Moreover, the mother liquor of the synthesis process can be recycled twice, which reduces the amount of raw materials and water consumption, and has potential practical application value.