-
Back Issue
- Current Issue
- Next Issue
- Special Issue
以实际刊发为准
-
LI Wenpeng, JIANG Linrui, YANG Jing, MIAO Qingshan, SHAN Shaoyun, SU Hongying
2025,42(1), DOI:
Abstract:
A series of fluorescent dextran hydrogels with typical three-dimensional sponge-like structure were prepared by the oxidation of dextran with sodium periodate and followed cross-linking with cystamine dihydrochloride via the aldehyde-amine Schiff base reaction. The effects of crosslinking density (-CHO/-NH2 molar ratio), dextran molecular weight and polymer concentration on the crosslinking time, microstructure, swelling properties and rheological properties of the obtained hydrogels were investigated, the results indicated that dextran hydrogel prepared with dextran T40, an oxidized dextran concentration of 75 mg/mL, and a -CHO/-NH2 molar ratio of 1.49 had the better three-dimensional network structure, viscoelastic properties and swelling properties. Furthermore, due to the presence of acid-sensitive Schiff base bonds and reduction-sensitive disulfide cleavage bonds, the resulted hydrogel exhibits pH/reduction dual sensitive degradation behavior, making it suitable for the application as an environmentally sensitive platform for local drug delivery.
-
ZHANG Jiyun, WU Qinggang, ZHA Keyu, LI jiqing, HAI Jiefeng, LU Zhenhuan
2025,42(1), DOI:
Abstract:
Two types of inorganic/organic composite films, SnS/P3HT and SnSe/P3HT, were prepared by combining the inorganic nanomaterials tin sulfide (SnS) nanoribbons or tin selenide (SnSe) nanosheets with the organic polymer 3-hexyl substituted polythiophene (P3HT). Using XRD, SEM, EDS, and Raman characterization techniques, the effect of the content of SnS or SnSe on the conductivity (σ), Seebeck coefficient (S), and power factor (PF) of the composite films was examined. The results indicate that the composite materials are physical mixtures of SnS nanoribbons or SnSe nanosheets and P3HT. Among the various compositions tested, the film containing 4% SnS nanoribbons and P3HT (SnS(4%)/P3HT) exhibits the highest power factor, 3.33 μW/mK2, which is 18.9% higher than that of the pure P3HT film (2.80 μW/mK2). The SnSe nanosheets are poorly dispersed within the SnSe/P3HT composite. Moreover, the degree of aggregation increases with the higher content of SnSe, resulting in a significant decrease in σ and failure to improve PF. So, the SnSe/P3HT composite film has no value for thermoelectric applications. Finally, this article studies the application of SnS/P3HT composite films in flexible thermoelectric devices. The SnS(4%)/P3HT flexible device achieved a maximum output power (Pmax) of 16.7 nW at an external load resistance (Rload) of 1.5 kΩ. After being subjected to 1000 cycles of repeated bending at a 4mm radius, the resistance relative deviation value of the SnS(4%)/P3HT composite film is 23.15%.
-
DU Dandan, MENG Ruixin, CAO Boya, ZHENG Ruiyi, SUN Baoguo, ZHANG Yuyu
2025,42(1), DOI:
Abstract:
A total of 244 aroma-active compounds including 52 olefins, 50 alcohols, 33 esters, 29 ketones, 23 aldehydes, 18 phenolics, 11 Sulfur-containing compounds, 10 acids, 8 esters, 7 alkanes and 3 nitrogen-containing compounds were identified in 29 elegant spices by the solvent extraction and solvent-assisted flavor evaporation extraction combined with GC-MS/O analysis. Vanilla (vanillin (11326.29 mg/kg), cumin (4-isopropylbenzaldehyde, 10231.54 mg/kg), mango (citral 4.62 mg/kg) and laurel (4-isopropylbenzaldehyde, 3471.25446 mg/kg) had the highest proportion of aldehydes. Srilanka citronella (geraniol, 1946.31 mg/kg), laurel (α-terpineol (14070.98 mg/kg; α-terpineol, 14070.98 mg/kg), cambodian cardamom (1,8-cineole, 502.06 mg/kg), sweet marijoram (linalool, 269.32 mg/kg), tsao-ko (nerolidol, 163.16 mg/kg; geraniol, 106.72 mg/kg), rosemary ((-)-4-terpineol, 3090.96 mg/kg), tamarind (1,8-cineole, 52.22 mg/kg; α-terpineol, 39.24 mg/kg), and saffron ((1α,2α,5α)-2-2-methyl-5-(1-methylethyl)-bicyclic [3.1.0] hex-2-ol, 88.74 mg/kg) had the highest proportion of alcohols. Juniper (anethole, 6961.66 mg/kg), angelia (germacrene D, 1050.88 mg/kg), turmeric (α-curcumene, 1305.00 mg/kg), licorice (trans-Calamenene, 435.68 mg/kg), rosemary (β-selinene, 1541.80 mg/kg; 4,7-dimethoxy-5-(2-propanyl)-1,3-benzodioxole, 1401.16 mg/kg), curry (β-selinene, 124.20 mg/kg) and sweet flag (anethole, 801.68 mg/kg) hag the highest proportion of olefins. Eugenol was the main phenolics in wild thyme (1174.51 mg/kg), fenugreek (1489.32 mg/kg), and tamarind (82.18 mg/kg). Terpinyl acetate was the main ester in caper (1239.92 mg/kg) and white mustard (249.88 mg/kg). Mango and Chinese mahogany had the highest amount and contents of sulfur-containing compounds, among them methional (2.21 mg/kg) and isopropylpropyldisulphide (4.29 mg/kg) were their main sulfur-containing compounds, respectively. 2,6-Dimethylpyrazine (23.02 mg/kg) and 4-allyl anisole (1072.18 mg/kg) were the main nitrogen-containing and ether compounds in sesame, respectively. Quantitative matrix describing network structure analysis divided the 29 elegant spices into 4 categories, and Chinese mahogany had the highest centrality, indicating its key role as a core bridge in the elegant spices network.
-
Preparation and properties of binary ceramide modified ethosomes for retinol palmitate and carnosine
LIANG Rong, JIA Liping, YANG Cheng
2025,42(1), DOI:
Abstract:
In order to improve the stability and transdermal efficacy of ethosomes, binary ceramide modified ethosomes was constructed by the combination of propylene glycol and ethanol. Furthermore, lipid soluble active substance, retinol palmitate (RP) and water-soluble active substance, carnosine (Car) were further selected to prepare RP-Car binary ceramide modified ethosomes (RP-Car binary cerethosomes), and the storage stability and transdermal properties were investigated. The results showed that when the volume ratio of ethanol to propylene glycol was 6:4, the encapsulation efficiency of RP in the RP-Car binary cerethosomes was (80.28 ± 0.10)%, and the encapsulation efficiency of Car was (47.20 ± 0.71)%; The TEM results showed that the RP-Car binary cerethosomes were relatively regular spherical vesicles with a particle size of about 70 nm; The RP-Car binary cerethosomes showed no significant changes after 120 days of storage at 4 ℃, 25 ℃ and 45 ℃; The results of in vitro transdermal experiment and laser confocal laser showed that the skin accumulation and permeability of RP and Car increased, and the skin accumulation was (0.273 ± 0.002) μg/cm2 and (22.521 ± 0.280) μg/cm2, respectively, the skin permeability was 0 μg/cm2 and (20.559 ± 0.120) μg/cm2, respectively.
-
HE Meizhi, XIAO Zhihao, CHEN Jiaxiang, BIAN Jing, XIE Peijing
2025,42(1), DOI:
Abstract:
Known for high latent heat, small subcooling, no phase separation and low cost, organic phase change materials are widely applied in the field of phase change energy storage. However, their thermal conductivity is low. As excellent thermal conductivity enhancers, carbon-based materials boast the characteristics of high thermal conductivity, large specific surface area, light weight and strong plasticity, and can be easily processed into various shapes from one-dimensional to three-dimensional structures, with good application scenarios adaptability. Therefore, carbon-based materials are largely used in the field of phase change energy storage to enhance thermal conductivity. This article reviews the research progress on one-dimensional, two-dimensional and three-dimensional carbon-based materials modifying organic phase change materials. Among them, the three-dimensional carbon-based materials or low dimensional carbon-based materials that can be constructed into three-dimensional structures, are found to outperform comprehensively. On the one hand, the three-dimensional skeleton structure can build a continuous heat conduction path for phase change materials and improve the thermal conductivity of phase change materials. On the other hand, the porous structure of carbon-based materials can provide strong surface tension and capillary force to effectively prevent liquid phase leakage of phase change materials. Through thorough analysis, the effects of carbon-based materials on improving the thermal conductivity, liquid phase leakage and thermal properties of organic phase change materials are summarized, and the possible problems in practical application and future development direction of carbon-based materials modifying organic phase change materials are foreseen.
-
Liu Chao, Tang Yufan, Xue Xin, Ji Zi, Yang Cang, Bao Yan
2025,42(1), DOI:
Abstract:
In this paper, gallium-based liquid metal (GLM) was coated with covalent organic framework polymers (COFs) with porous structure and good organic compatibility, and GLM@COFs solid-liquid composite lubricating microcapsules were prepared, and the GLM@COFs/PI composite coating was prepared by adding them to polyimide (PI). The results show that the spherical structure of GLM@COFs-solid-liquid composite lubrication microcapsules has been successfully prepared. When the GLM@COFs addition amount (mass fraction) was 0.9%, the tribological properties of the GLM@COFs/PI composite coating were the best, with the friction coefficient and volume wear rate of 0.22 and 6.3×10-6 mm3/(N·m), respectively. Compared to PI coating, it was reduced by 35.3% and 61.1%, respectively. This is mainly due to the fact that COFs-coated GLM can not only effectively improve the compatibility between GLM and PI matrix, but also effectively play the role of synergistic friction reduction and wear resistance between COFs and GLM.
-
YU Moxin, ZHANG Zhen, SHI Wenxu, SUN Yuhang, ZHANG Chen, WANG Xiaoting, KE Qingping
2025,42(1), DOI:
Abstract:
In order to address the issue of Ni2+ and Co2+ pollution in lithium-ion battery waste, a novel biochar adsorption material utilizing aloe peel as the raw material has been developed. The fabrication of this biochar involves the incorporation of (NH4)2SO4 as a nitrogen and sulfur source to prepare a carbon precursor via hydrothermal synthesis, followed by the pyrolysis process at different final temperatures to produce N, S co-doped biochar (NSBCx). The resulting NSBCx material was characterized using techniques such as SEM, N2 adsorption-desorption, XPS, and ZETA potential analysis to evaluate its adsorption capacity for Ni2+ and Co2+ in the waste solution. The results show that the surface of NSBCx is exposed with complex lamellar stacking porous structure, with NSBC800 synthesized at an activation temperature of 800 °C displaying a hierarchical porous structure, a non-microporous proportion of 46%, a micropore volume of 0.07 cm3/g, and a specific surface area of 149 m2/g. Furthermore, NSBC800 surface was found to contain a significant amount of oxygen (29.94%), nitrogen (4.79%), and sulfur (6.21%) elements, with adsorption capacities of 245.10 mg/g for Ni2+ and 223.71 mg/g for Co2+. The chemical functional groups consisting of oxygen, nitrogen, and sulfur elements on the surface of NSBC800 underwent significant changes after adsorbing Ni2+ and Co2+, and these functional groups were able to react with metal ions to form salts or complexes, depositing on the biochar surface. The adsorption process of NSBCx for Ni2+ and Co2+ was found to be better described by the Langmuir model and pseudo-second-order kinetic model, with the adsorption process being chemisorption-controlled. Multiple mechanisms including chelation, co-precipitation, ion exchange, and electrostatic attraction were identified to simultaneously remove Ni2+ and Co2+ from the waste solution.
-
WANG Chenjing, QIU Xiaolin, ZHANG Xinchang, GAO Shujunwen, SUN Haonan
2025,42(1), DOI:
Abstract:
The surface strength of expanded polypropylene (EPP) products can be improved and their service life extended through the application of coatings. However, developing coatings with high adhesion to unmodified EPP materials remains a challenge. In this study, polypropylene-grafted-amine (PP-g-NH2) was used as a modifier and crosslinking agent, and a waterborne polyurea (WPUA) was prepared by introducing hydrophilic monomer dimethylolpropionic acid (DMPA) into the polyurea molecular chain using a prepolymer method. The aim was to improve the poor adhesion of the polyurea coating to the foamed polypropylene (EPP) substrate. Fourier transform infrared spectroscopy (FT-IR) confirmed the successful incorporation of PP-g-NH2 into the WPUA molecular chain.The effect of PP-g-NH2 content (mass percentage of PP-g-NH2 relative to the total mass of modified WPUA raw materials) on the adhesion, contact angle, solvent resistance, mechanical properties, and thermal stability of WPUA was investigated. The study found that introducing a 1.5% mass fraction of PP-g-NH2 into the system resulted in enhanced membrane properties. The modified membranes exhibited a water absorption capacity of 14.52% and a contact angle of 84.85°, outperforming unmodified EPP. Additionally, the modified membranes showed improved tensile strength (30.6 MPa) and elongation at breakage (233.7%). Furthermore, the thermal decomposition temperature of the modified membranes increased by 20℃and the adhesion to EPP reached 0.89 MPa, representing a 65% improvement compared to unmodified polyurea.
-
ZHANG Fan, MAO Yue-cheng, SHEN Lu-yang, CAI Zai-sheng, XU Qun-na, MA Jian-zhong
2025,42(1), DOI:
Abstract:
Photochromic materials have poor affinity with fibers and are difficult to dye, which limits the development of photochromic fabrics. To solve these problems, cellulose-based photochromic hydrogels (CPHs) were prepared by using cellulose and spiropyrane as matrix under the crosslinking of epichlorohydrin, and the photochromic regularity of the new photochromic hydrogels were investigated. SEM results showed that CPHs had a three-dimensional network porous structure. As a new photochromic material and fabric finishing agent, CPHs were finished by conventional dipping process to obtain photochromic cotton fabrics. The UV-Vis results showed that the photochromic fabric had fast photochromic response in UV and achieved fast coloring and fading within 2-3 min. More importantly, the photochromic fabric can hold on more than 10 reversible cycles of color change no matter before and after soap washing, which further proved that CPHs had excellent photochromic cycle ability and light fatigue resistance, and has a strong affinity with cotton fabric. This work provided new application ideas for the development of new photochromic materials, hydrogel fabric finishing agents and intelligent color-changing fabrics..
-
2025,42(1), DOI:
Abstract:
Hydroxy ethyl acrylate (HEA), acrylic acid (AA), and butyl acrylate (BA) were utilised as monomers in a reaction to produce a water-based polyacrylate emulsion. This emulsion was then employed to create an emulsion pressure-sensitive adhesive using semi-continuous seed emulsion polymerization. The shading resistance of the emulsion pressure-sensitive adhesive was enhanced through the utilisation of a crosslinking agent or by subjecting it to vacuum treatment. The properties of polyacrylate emulsion and emulsion pressure-sensitive adhesive were investigated by analysing the characterization of FTIR, TEM, TGA, particle size, and viscosity. The effects of the amount of initiator (ammonium persulfate), stirring speed, reaction temperature, and holding time on these properties were examined. An investigation was conducted to examine the impact of the kind and quantity of an additional crosslinking agent (expressed as a percentage of the mass of polyacrylate emulsion) and the duration of vacuum treatment on the properties of emulsion pressure-sensitive adhesive. The findings indicated that the characteristics of polyacrylate emulsion (PSA-1 emulsion) and emulsion pressure-sensitive adhesive PSA-1 were enhanced when created with an initiator dosage of 0.4%, stirring speed ranging from 700 to 800 r/min, reaction temperature of 85 ℃, and holding period of 2 hours. The emulsion pressure-sensitive adhesive exhibited improved shadow resistance when the dosage of aziridine was increased to 1.0% and 1.5%. The emulsion pressure-sensitive adhesive PSA-1-60, which is produced by subjecting the PSA-1 emulsion to vacuum treatment for a duration of 60 minutes, exhibits exceptional bonding characteristics and resistance to shadowing. The initial adhesion of the material is 25#, while the peel strength is 1.85 N/cm at 180°. Additionally, there are no visible shadows on the surface of the test mirror plate.
-
FEI Gui-qiang, GAO Teng-teng, CHEN Guang-di, CHEN Yang-fang, WANG Dan-dan, BAI Yang
2025,42(1), DOI:
Abstract:
Thermosetting epoxy resins have been widely used in the field of fine polymer coatings due to their excellent comprehensive property. However, it is still an important challenge to fabricate epoxy resin coatings with mechanical, hydrophobic, and salt spray resistance properties through two-component structure design. In this paper, triethylenetetramine (TETA), epoxy monomer E51 and polyether flexible chain segment (DEG501) were added through ring opening reaction to obtain single flexible segment curing agent (TED), and then modified with dimer acid flexible segment (DA) TED to obtain double flexible segment curing agent (DTED). Subsequently, epoxy monomer E51 was reacted with curing agent TED and DTED respectively, to obtain epoxy resin E51-TED based on single flexible segment and epoxy resin E51-DTED based on double flexible segment . The structures and properties of the two epoxy resins were characterized by FT-IR, 1H NMR, SEM, TEM, thermogravimetric analyzer, universal tester, salt spray machine and contact angle tester. The results show that the glass transition temperature of epoxy resin E51-DTED reaches 123 °C, the maximum compressive strength can reach 46.564 MPa, the maximum water contact angle can reach 95.7°, and the salt spray resistance can reach up to 96 h, the volume swelling rate in water can reach 0.33%. The introduction of dual flexible segments enables the epoxy resin to exhibit excellent thermal stability, outstanding mechanical properties, good hydrophobicity, water resistance and resistance to salt spray.
-
YAN Jiingxuan, ZHANG ningshuang, LI shiyou, WANG mengya, LI xiaohua
2025,42(1), DOI:
Abstract:
A considerable number of achievements based on cathode materials have been demonstrated for AZIB. Nevertheless, commonly cathode materials are challenged with persistent issues that remain to be further studied and support from key technologies, including weak structural stability, cathode dissolution, severe electrostatic interaction and poor electric conductibility. The energy storage mechanism of manganese dioxide (MnO2) as the cathode material of AZiBs is more complex than other materials and has been controversial, which is the main factor limiting the application prospect of Zn//MnO2 batteries. Therefore, this paper provides a comprehensive summary of the characteristics and energy storage mechanisms of the latest MnO2-based cathode materials, critically reviews the basic problems and corresponding deep-seated reasons of MnO2-based cathode materials, and systematically summarizes and discusses the optimization strategies in recent work reports. Finally, based on the problems existing in different energy storage mechanisms of MnO2, combined with the latest research progress, a series of key challenges to promote the commercialization of Zn//MnO2 batteries are summarized, providing relevant ideas and prospects for the future research trend of AZBs.
-
SNJ nijing, XIE shuibo, ZHANG lantao, JIANG peixuan, MAI yinqing, HU lian
2025,42(1), DOI:
Abstract:
The removal mechanism of U(VI) from water by biochar loaded nano chlorapatite, denoted as BC/nClAP, and the effect of humic acid on the removal process were experimentally investigated. The materials were also characterized by XRD, SEM, FTIR and XPS. The results showed that the biochar-loaded nano chlorapatite had a good removal effect on uranium in water (when the initial concentration of U(VI) was 5 mg/L, the dosage of BC/nClAP was 0.1 g/L, and the pH value was 4.0, the removal rate of U(VI) by BC/nClAP was as high as 99.7%), and the humic acid had a significant effect on the removal effect and shortened the equilibrium time of the adsorption (shortened the equilibration time from 30 min to less than 5 min). Regardless of the presence or absence of humic acid, the removal of U(VI) by BC/nClAP could be fitted by quasi-secondary kinetic equation and Langmuir isothermal adsorption model. It was shown that the process of U(VI) removal by BC/nClAP was monomolecular layer chemisorption. The removal mechanism mainly includes dissolution-precipitation and complexation of oxygen-containing functional groups on the surface of biochar. Humic acid affects the adsorption process probably because humic acid seizes the adsorption sites; and it forms a free-in-water U-HA complex with U(VI), which alters the surface interaction of U(VI) and HA with the material.
-
LI Lingdong, LIU Pengfei, ZHANG Weilun, ZHANG Songwei, JIA Dongxue, ZHOU Hao
2025,42(1), DOI:
Abstract:
Two types of long-chained pyridinium N-chloramines based on 4-hydroxypyridine were synthesized via poly-step strategy. The structure of precursor and corresponding N-chloramine was confirmed by NMR and HRMS, and antibacterial activity of synthetic N-chloramines was preliminarily tested against E. coli (ATCC 25922) and S. aureus (ATCC 25923) using N-chloramine IIb as control. Antibacterial data showed that the antibacterial activity of para-derivative of pyridinium N-chloramine is superior to that of meta derivative counterpart, and that antibacterial activity showed an increasing trend with the attached chain lengthens. Specifically, the odecyl chained (-C12H25) pyridinium N-chloramine (XIIId/XVe) present the towering antibacterial efficacy, probably due to ‘synergistic’ biocidal action between N-chloramine moiety and long-chained pyridinium center. Besides, N-chloramine XVe derived from N-alkylation exhibits even higher bactericidal activity comparatively, achieving so far the most efficacious N-chloramine antimicrobial.
-
Lyu Bin, Liu Yu-chen, Yang Hai-en, Hu Jia-rui, Gao Dang-ge
2025,42(1), DOI:
Abstract:
Fatty alcohol polyoxyethylene ether (AEO) and acrylic acid (AA) as raw materials were synthesized by esterification reaction, and then a negative non-ionic polymer surfactant (P-AASL) was prepared by free radical polymerization with sodium styrene sulfonate (SSS) and dodecyl acrylate (LA). The structure and molecular weight distribution of P-AASL were characterized by FTIR, 1H NMR and GPC. The aggregation structure of P-AASL in solution was characterized by DLS and TEM. The surface interfacial tension, wettability, salt resistance and thermal stability of P-AASL were tested by DSC, contact Angle tester and surface and interfacial tension tester. The effects of different m(P-AASL):m(sodium petroleum sulfonate) (1:9~5:5) on the surface boundary activity and oil washing efficiency of the composite surfactant system were investigated. The results show that P-AASL belongs to the macromolecular surfactant, its number average molecular weight (Mn) is 12121, weight average molecular weight (Mw) is 14027, and polydispersion index is 1.157. P-AASL is a spheroidal micelle with an average particle size of 141.7 nm and a polydispersion index of 0.136. The critical micelle mass concentration of P-AASL solution is 0.62 g/L, and the lowest surface tension is 33.4 mN/m. P-AASL solution with 0.3% mass fraction can reduce the oil-water interfacial tension to 1×10-1 mN/m, and reduce the water-contact Angle of oil-wet natural core to less than 40°. P-AASL thermal decomposition occurs at 300 ℃ or above. The tolerance of P-AASL to NaCl and CaCl2 in aqueous solution was 140 g/L and 8 g/L, respectively. The interfacial tension between crude oil and water can be reduced to 1×10-3 mN/m when the mixture ratio is 8:2, the emulsification water separation time of crude oil is more than 50 min when the mixture ratio is 5:5, and the oil washing efficiency is about 77% when the mixture ratio is more than 3:7.
-
CHENG Jing, TANG Yu-ang, ZHU xing-yu, CAI Qing-wen, WANG Yi-dan, YUN Yi-xin, YUAN Xu-feng, Zhu Wan-bin, WANG Hongliang
2025,42(1), DOI:
Abstract:
Fertilizers play a crucial role in agricultural production. However, the extensive use of traditional fertilizers has caused serious negative impacts on the environment. In order to achieve sustainable development, coated controlled-release fertilizers have gained significant attention as alternatives to traditional fertilizers. This fertilizer typically exhibits a core-shell structure and controls the release rate of the inner layer fertilizer by manipulating the outer shell layer. It can reduce environmental pollution, regulate nutrient release rate, enhance fertilizer utilization efficiency, and increase crop yield. The key to the preparation of coated controlled-release fertilizers lies in the development of high-performance, cost-effective, and environmentally friendly functional coating materials. This review paper provides an overview of the current research status of domestic and foreign coated controlled-release fertilizers, the types of coating materials, coating processes, and controlled-release mechanisms. The paper also analyzes the problems in their application and prospects the potential applications of these fertilizers in agriculture.
-
FU Chengchen, LAI Lu, ZHOU Peiru, LAI Hongjing, CAO Jiliang
2025,42(1), DOI:
Abstract:
For the purposes of improve the functionality of cotton fabric, cotton fabrics were modified with glyoxal and chitosan (CS) to obtain CS-modified cotton fabrics, then the CS modified cotton fabric was impregnated with graphene oxide (GO) dispersion, and finally the GO adsorbed on the fabric was reduced to reduced graphene oxide (RGO). RGO/CS-cotton fabric with conductive, UV resistant and antibacterial properties was prepared. Based on SEM, FTIR and Raman spectroscopy, the effects of CS mass fraction and GO dispersion mass concentration on the electrical conductivity, UV resistance and antibacterial properties of RGO/CS-cotton fabric were investigated, and the washability of the fabric was tested. The results show that the GO deposited on the surface of RGO/ CS-cotton fabric is fully reduced to RGO, and the surface is covered with a continuous layer of RGO/CS film. The electrical conductivity of RGO/CS-cotton fabric increases gradually with the increase of GO dispersion concentration, mainly due to the good electrical conductivity of RGO. The RGO/CS-cotton fabric modified with 2% CS solution and treated with 5 g/L GO dispersion has the best electrical conductivity, and the surface resistance is 1.02 kΩ/cm. The antibacterial performance of RGO/CS-cotton fabric was enhanced by the collaboration of RGO and CS, and the antibacterial rate was up to 95%. The RGO/CS-cotton fabric modified with 0.5% CS solution and treated with 3 g/L GO dispersion after 30~50 times of soaping has little change in conductivity, bacteriostatic and UV resistance.
-
MAO Yuan-yuan, PENG Jin-song, CHEN Chun-xia
2025,42(1), DOI:
Abstract:
A series of 4H-pyrido[1,2-a]pyrimidin-4-one derivatives were obtained by lignosulfonic acid-catalyzed annulation of 2-aminopyridines with β-oxo esters under the condition of ethanol as solvent at 100 °C for 24 hours. The structures of products were elucidated by 1H NMR and 13C NMR, and the maximum yield can reach 84%. The lignosulfonic acid catalyst is obtained by acidification of lignosulfonate, a byproduct of the paper-making industry. After 4 repeated uses, the yield can reach 75%, and the catalytic activity does not significantly decrease. The reaction scale is expanded to the gram level, and the catalytic effect remains unchanged.
-
QI Yu Hui, WANG Tao, MA Xue e, CHANG Yue
2025,42(1), DOI:
Abstract:
The g-C3N5/β-Bi2O3 (CN/BO) composites were prepared by hydrothermal and calcination method using g-C3N5, Bi(NO3)3.5H2O and Na2C2O4 as raw materials. The structure, morphology and photoelectric properties of CN/BO were characterized by XRD, SEM, TEM, UV-Vis DRS, PL and EIS. The photocatalytic degradation performance of CN/BO was tested for TC in tetracycline hydrochloride (TC) aqueous solution under simulated natural light conditions. The effects of TC aqueous mass concentration, CN/BO dosage, solution pH and inorganic anion are investigated on the degradation rate of TC, as well as the substrate universality and recycling performance of CN/BO. And the mechanism of photocatalytic degradation of TC is speculated by CN/BO. The experiment results indicate that photocatalytic activity of CN/BO is better than a single material. 50CN/BO (the mass of g-C3N5 and β-Bi2O3 were equal) has the best photocatalytic activity. When 20 mg 50CN/BO are added in 30 mL, 20 mg/L TC solution for illumination 90 minutes, the photodegradation rate of TC and total organic carbon (TOC) removal rate are 94.1% and 72.4%, respectively. The degradation rate of six common water pollutants, such as Rhodamine B (RhB) and malachite green (MG), is 81.0%~99.8% illumination 60 minutes. CO32? can reduce the degradation rate of TC, but S2O82? can increase the degradation rate of TC in solution. The photocatalytic performance of 50CN/BO is basically unchanged when the solution of pH is 6-12. 50CN/BO is used for 5 times and still maintain high catalytic activity. The main active species are h+ and ?O- 2 groups in degradation reaction. S-type heterojunction is formed between β-Bi2O3 and g-C3N5 to improve the charge separation and transfer ability also to increase the number of active groups participated in the photodegradation reaction of CN/BO.
-
WANG Xuechao, LI Wenxuan, YANG Lili, DONG Sanqiang, LI Jie
2025,42(1), DOI:
Abstract:
Compared with other traditional nitrogen removal technologies, the Anaerobic ammonium oxidation (Anammox) process is a new nitrogen removal process with the advantages of no additional carbon source, energy saving and emission reduction. However, in the practical application process, it is difficult to start up quickly due to sludge loss. Anammox granular sludge (AnGS) can improve the efficiency of nitrogen removal and ensure the long-term stable operation of the Anammox process, the reinforcement of AnGS by adding iron is one of the most widely studied, economical, and practical measures at present. This paper briefly describes the characteristics, metabolic pathways, and aggregation mechanism of Anaerobic ammonium oxidation bacteria (AnAOB), focusing on combining the mechanism of iron regulation of AnGS in terms of regulating the synthesis of enzymes and the expression of functional genes, accelerating the enrichment of functional bacteria, supplying granular sludge condensation nuclei, promoting the secretion of extracellular polymer (EPS), and strengthening the systemic group induction, to provide theoretical guidance for the development and application of iron-enhanced Anammox technology.
-
MA Wenhao, MA Yue, WU Ming-ou, ZHOU Mingyu, Wang Zhihong
2025,42(1), DOI:
Abstract:
In order to against the backdrop of global warming and achieve China"s carbon peak and neutrality targets, finding effective CO2 capture technologies is of significant importance for mitigating greenhouse gas emissions. Metal-organic frameworks (MOFs), as a new type of adsorbent material with highly tunable and excellent porous structures, have garnered widespread attention from researchers in the past decade. This article elaborates on the common types of MOF adsorbent materials, synthesis methods, influencing factors, and modification approaches, delving into the main drawbacks hindering the performance improvement of MOFs adsorbent materials. Besides, the optimization of the preparation conditions of hydrothermal synthesis, the construction of composite MOFs with core-shell structures, the enhancement of water resistance by introducing organic ligands with non-polar groups and the composite modification of MOFs with porous solid materials were proposed as four important research directions in the future.
-
QIN Yi, PAN Liuyi, LU Chenyang, WANG Yingxia, NIU Menglong, LI Dong
2025,42(1), DOI:
Abstract:
CO2 methanation is an important measure to address current environmental issues. Ni-Fe bimetallic catalysts have been widely used in CO2 methanation reactions, but there is limited research on their synergistic effects and reaction mechanisms. In this paper, Ni/Al2O3 and Ni-Fe/Al2O3 catalysts were prepared by hydrothermal method and evaluated experimentally, and the effect of Fe doping on CO2 methanation was investigated through a combination of experiment and theory. The experimental results show that Ni-Fe catalyst has better catalytic performance, with a CO2 conversion rate of 84.24% and a CH4 selectivity of 83.53% at a temperature of 375 ℃. DFT calculations show that the introduction of the second metal element Fe dilutes the surface of Ni-Fe and alters its electronic properties. The Ni-Fe surface not only enhances the adsorption of CO2 on the catalyst surface, resulting in a higher degree of CO2 activation, but also makes the dissociation of H2 easier, which is conducive to the progress of hydrogenation reactions. In addition, the introduction of Fe also changes the reaction pathway of CO2, directing the reaction towards the generation of CH4, The specific pathway is CO2*→HCOO*→HCOOH*→H2COOH*→H2CO*→H3CO*→CH4*.
-
GUO Keyu, Wang Junqi, LI Xiangyu, Pan Yu, FENG Yaqing, ZHANG Bao
2025,42(1), DOI:
Abstract:
Foam extinguishing agents can effectively control or extinguish fires by blocking oxygen, lowering fuel temperature and preventing fuel vapor release from contact with air, and its key component is surfactants that reduce the interfacial tension between water and oil. However, PFOS is strictly regulated due to its environmental and health hazards, so research to develop alternatives to PFOS is urgent. In this paper, the hazards of PFOS in fluorine-containing foam fire extinguishing agents are briefly described, and the structural characteristics and development status of three types of surfactants in foam fire extinguishing agents are discussed: 1) C4 short-chain perfluoroalkyl sulfonic acid surfactants; 2) fluorosurfactants containing branched chains of CF3CF2CF2C(CF3)2 groups and fluorocarbon surfactants with ether bonds introduced; 3) Silicone surfactants. Finally, the application prospects of three types of surfactants are prospected. This paper focuses on the analysis and summary of the current design strategies of substitutes from a structural perspective, which will provide guidance and support for the research and development of green and environmentally friendly foam fire extinguishing agents.
-
HE Yin-kun, SHAO Liang, LIU Mei-ling, JI Zhan-you, MA Jian-zhong, WANG Wen-qi
2025,42(1), DOI:
Abstract:
In order to prepare poly (butylene adipate-co-terephthalate) (PBAT) foamed composites with low filling and high performance, rice straw fiber (RSF) was modified with phosphoric acid and melamine to obtain modified rice straw fiber (MPRSF). Then MPRSF and expandable graphite (EG) were ball-milled to prepare interfacial solder (EG-MPRSF), and EG-MPRSF@PBAT foamed beads were prepared by coating PBAT with EG-MPRSF. Finally, expandable graphite-modified straw fiber@PBAT (EG-MPRSF@PBAT) foamed bead composites were prepared by supercritical carbon dioxide (scCO2) and microwave sintering technology. Based on FTIR, XPS, SEM, EDS characterization and TGA, hardness, resilience and compressive strength test, limiting oxygen index test, vertical combustion grade test and cone calorimeter test, the effects of EG-MPRSF mass fraction (EG-MPRSF mass percentage of PBAT foamed bead mass, the same below) on the mechanical properties and flame retardant properties of the prepared EG-MPRSF@PBAT foamed bead composites were investigated. The results show that the EG-MPRSF@PBAT foamed beads composite can retain the original cell structure of PBAT foamed beads after sintering, and its hardness, resilience and compressive strength are greatly improved, and it has flame retardant properties. When the mass fraction of EG-MPRSF was 0.2%, the compressive strength, resilience and hardness of the prepared EG-MPRSF@PBAT foamed bead composites were 77.8%, 16.7% and 45.2% higher than those of the PBAT foamed bead composites without EG-MPRSF, respectively. The smoke production rate and total smoke production decreased by 14.9% and 24.8%, respectively, and the total heat release decreased by 17.1%.
