作者： Liu, Zengcheng;Wang, Zhongchao;Wang, Yanfei

期刊： Research on Chemical Intermediates,2024年50(6):2897-2915 ISSN：0922-6168

通讯作者： Wang, YF

作者机构： [Liu, Zengcheng; Wang, Yanfei; Wang, Zhongchao] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

通讯机构： [Wang, YF ] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

关键词： Phosphinimide;Polymerization precipitation;Adsorption;Uranium(VI);Endothermy

摘要： The phosphinimide materials described in this paper were synthesized by polymerization precipitation. The properties of complexes coordinated with metal ions can be used as adsorbents for the adsorption of radioactive elements by using ligands such as imide and phosphorus groups. Then, the synthetic phosphinimide was characterized in detail by FT-IR, SEM, EDS and XPS, and its morphology and structural changes were studied. In addition, the effects of the material on the removal of uranium(VI) from aqueous solutions at different pH, sorbent doses, contact times, initial concentrations, and temperatures were studied. The experimental data shows that the adsorption process can fit the pseudo-second-order kinetic model well, which is in line with the Langmuir isotherm model. The thermodynamic study of adsorption shows that the adsorption process is a spontaneous endothermic process. In addition, at a temperature of 303.15 K and pH = 6, the maximum adsorption of uranium(VI) by phosphinimide in 25 min can reach 234.6 mg g−1, and a removal rate of 97.75%.

语种： 英文

作者： Liu, Zengcheng;Wang, Yanfei;Xu, Yufen;Peng, Tianqiong

期刊： Journal of Radioanalytical and Nuclear Chemistry,2024年333(1):357-373 ISSN：0236-5731

通讯作者： Wang, YF

作者机构： [Liu, Zengcheng; Wang, Yanfei; Xu, Yufen; Peng, Tianqiong] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

通讯机构： [Wang, YF ] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

关键词： Isotherms;Polymerization;Uranium compounds;Adsorption process;Elimination;Endothermic;Langmuir isotherm models;Polymerization precipitation;Pseudo-second-order kinetic models;Synthesised;Tetraphenyldithiodiphosphonate;Thermodynamic studies;XRD;Adsorption;etidronic acid;tetraphenyldithiodiphosphonate;unclassified drug;uranium;adsorption kinetics;aqueous solution;Article;chemical bond;chemical modification;Fourier transform infrared spectroscopy;polymerization;room temperature;scanning electron microscopy;thermodynamics;X ray diffraction;X ray photoemission spectroscopy

摘要： Tetraphenyldithiodiphosphonate is synthesized by polymerization precipitation. The P = S bond of the material has strong polarity, which is conducive to improving the electron mobility of the complex and inhibiting the accumulation between molecules. The synthesized tetraphenyldithiodiphosphonate is characterized by FT-IR, SEM, XPS and XRD. In addition, the pseudo-second-order kinetic model is used to simulate the experimental data well, and the adsorption process conforms to the Langmuir isotherm model. Thermodynamic studies of adsorption have shown that the adsorption process is essentially a spontaneous endothermic process. At room temperature, tetraphenyldithiodiphosphonate demonstrates a maximum adsorption capacity for uranium(VI) reaching 398.8mgg−1. © 2023, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文

作者： Xu, Yufen;Wang, Yanfei

期刊： Progress in Nuclear Energy,2023年166:104957 ISSN：0149-1970

通讯作者： Wang, YF

作者机构： [Wang, Yanfei; Xu, Yufen] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

通讯机构： [Wang, YF ] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

关键词： Triphenyl phosphate (TPP);Bis (diphenyl phosphate) imine (Htpop);U(VI);Adsorption

摘要： Bis(diphenyl phosphate) imine(Htpop) was synthesized as an adsorbent for the effective removal of U(VI) from aqueous solutions using triphenyl phosphate(TPP) as the starting material. Htpop possesses notable polarity, characterized by the presence of -P--O(phosphoryl) and -N-H(imino) functional groups, along with other bulky substituents. It has the capability to form chelates with metal ions, thus enabling the removal of radionuclide U (VI) from aqueous solution. The overall adsorption experiment shows that both phosphoryl and imino groups interact with uranyl ions, and the removal rate reaches 99.53 % at pH 6.0. The adsorption process conforms to the Pseudo-second-order kinetic model and Langmuir isotherm model.

语种： 英文

作者： Xu, Yufen;Peng, Tianqiong;Liu, Zengcheng;Wang, Yanfei

期刊： ChemistrySelect,2023年8(22) ISSN：2365-6549

通讯作者： Wang, YF

作者机构： [Liu, Zengcheng; Wang, Yanfei; Xu, Yufen; Peng, Tianqiong] Univ South China, Dept Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Wang, YF ] U;Univ South China, Dept Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.

关键词： Adsorption;Bis (diphenyl phosphate) imine (Htpop);Thorium (IV)

摘要： Bis (diphenyl phosphate) imine (Htpop) was synthesized using a simple one‐step solvent method to remove thorium (IV) from aqueous solutions. The structure, functional group displacement, morphological differences, and elemental composition of the samples were analyzed using characterization techniques such as NMR, FTIR, SEM, EDS, and XPS. According to the batch experiment, when pH=4.0 and temperature was 298 K, the adsorption equilibrium can be reached within 40 min, and the adsorption capacity was 189.32 mg ⋅ g−1. The adsorption process conforms to the quasi‐second‐order kinetic model (R2=0.9959) and Langmuir model (R2=0.9971). Thermodynamic data (▵H0<0, ▵G0<0) indicate that the adsorption behavior of thorium (IV) in Htpop was spontaneous and exothermic. Abstract Bis (diphenyl phosphate) imine (Htpop) was synthesized using a simple one‐step solvent method to remove thorium (IV) from aqueous solutions. The structure, functional group displacement, morphological differences, and elemental composition of the samples were analyzed using characterization techniques such as NMR, FTIR, SEM, EDS, and XPS. According to the batch experiment, when pH=4.0 and temperature was 298 K, the adsorption equilibrium can be reached within 40 min, and the adsorption capacity was 189.32 mg ⋅ g−1. The adsorption process conforms to the quasi‐second‐order kinetic model (R2=0.9959) and Langmuir model (R2=0.9971). Thermodynamic data (▵H0<0, ▵G0<0) indicate that the adsorption behavior of thorium (IV) in Htpop was spontaneous and exothermic.

语种： 英文

作者： Peng, Tian-qiong;Wang, Yanfei

期刊： Separation Science and Technology,2023年58(10):1731-1747 ISSN：0149-6395

通讯作者： Wang, YF

作者机构： [Peng, Tian-qiong; Wang, Yanfei] Univ South China, Sch Chem & Chem Engn, Hengyang, Peoples R China.;[Wang, Yanfei] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

通讯机构： [Wang, YF ] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

关键词： Mesoporous silica;Tetraethylenpentamine;Triethanolamine;Response surface;Adsorption;Uranium

摘要： In this study, amino modified mesoporous silica (HMS-TEEPA-TEA) was used for the first time to remove uranium (VI) from aqueous solution. The synthesized HMS-TEEPA-TEA was characterized by SEM, EDS, FTIR, BET and XPS techniques. The present work attempted to optimize and compare the adsorption process parameters like pH, adsorbate concentration, and adsorbent dose using Box-Behnken designs of response surface methodology. The adsorption amount and removal rate reached 337.26 mg/g and 99.57%, respectively. Model P> F < 0.0001 in this experiment (generally P > F < 0.05 is considered significant), indicating that the model is extremely significant and can be considered as highly referable for its predicted response values. The fit of the data to the Langmuir isotherm and the proposed secondary kinetics indicates that the adsorption process is monolayer and chemical in nature. The effect of copper on HMS-TEEPA-TEA adsorption is more complex than other background ions. The removal of uranium (VI) by HMS-TEEPA-TEA remained above 80% for four consecutive experiments with repeated adsorbent use. The results indicate that HMS-TEEPA-TEA is an effective adsorbent for the removal of uranium (VI) from aqueous solutions with the advantages of low cost, high availability and easy production.

语种： 英文

作者： Peng, Tian-qiong;Wang, Yan-fei;Xu, Yu-fen;Liu, Zheng-chen

期刊： Journal of Radioanalytical and Nuclear Chemistry,2023年332(2):409-422 ISSN：0236-5731

通讯作者： Yan-fei Wang

作者机构： [Peng, Tian-qiong; Wang, Yan-fei; Xu, Yu-fen; Liu, Zheng-chen] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

通讯机构： [Yan-fei Wang] S;School of Chemistry and Chemical Engineering, University of South China, Hengyang, People’s Republic of China

关键词： adsorbent;poly tetraethylenepentamine trimesoyl chloride;unclassified drug;uranium;adsorption kinetics;aqueous solution;Article;chemical structure;concentration response;energy dispersive X ray spectroscopy;Fourier transform infrared spectroscopy;intermethod comparison;pH;reaction optimization;scanning electron microscopy;synthesis;thermodynamics;thermogravimetry;water management;X ray photoemission spectroscopy

摘要： For uranium adsorption in water, a new uranium adsorbent was synthesized by preparing poly(tetraethylenepentamine–trimesoyl chloride). The samples were characterized using SEM, EDS, TGA, FTIR and XPS. The removal ability and adsorption mechanism of uranium (VI) in an aqueous solution by poly(tetraethylenepentamine–trimesoyl chloride) were systematically studied. The results showed that the adsorption equilibrium was completed within 80min, the adsorption capacity reached 189.82mgg−1, and the removal rate reached 94.91%. The adsorption process fitted well with the pseudo-second-order model and the Langmuir isotherm model. The thermodynamic analysis indicated that the adsorption was an endothermic and spontaneous process. This study proved that poly(tetraethylenepentamine–trimesoyl chloride) could be considered a highly efficient and sustainable material for the removal of uranium (VI) from aqueous solutions. © 2023, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文

作者： Wang, Chunhui;Xian, Keyi;Zhao, Shuangshuang;Ma, Shuailing;Qin, Haozhe;...

期刊： Nano Energy,2023年118:109020 ISSN：2211-2855

通讯作者： Lin, YW;Ou, X;Feng, M

作者机构： [Lin, Ying-Wu; Zhao, Shuangshuang; Wang, Chunhui; Xian, Keyi; Wang, Yanfei] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;[Wang, Chunhui; Qin, Haozhe; Ou, Xing] Cent South Univ, Engn Res Ctr, Sch Met & Environm, Minist Educ Adv Battery Mat, 932 South Lushan Rd, Changsha 410083, Hunan, Peoples R China.;[Feng, Ming] Jilin Normal Univ, Key Lab Funct Mat Phys & Chem, Minist Educ, Changchun 130103, Peoples R China.;[Wang, Dong] Jilin Univ, Electron Microscopy Ctr, Sch Mat Sci & Engn, Key Lab Automobile Mat MOE,Jilin Prov Int Cooperat, Changchun 130012, Jilin, Peoples R China.;[Wang, Dong] Jilin Univ, Int Ctr Future Sci, Changchun 130012, Jilin, Peoples R China.

通讯机构： [Feng, M ] J;[Lin, YW ] U;[Ou, X ] C;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;Cent South Univ, Engn Res Ctr, Sch Met & Environm, Minist Educ Adv Battery Mat, 932 South Lushan Rd, Changsha 410083, Hunan, Peoples R China.

关键词： Potassium ion battery;Cobaltous sulfide;Fe cluster;Interfacial engineering;Synergistic effect

摘要： Interfacial engineering, especially atomic substitution at the interface or inside the nanomaterials, is a promising strategy for fabricating high-performance electrode materials. Herein, an interfacial modification strategy was reported to develop cobaltous sulfide (CoS2) nanomaterials with Fe clusters modified on their interface and Fe single atoms partially substituted Co atoms in CoS2 (Fe-CFS), which were further wrapped by graphene networks, forming highly active Fe-CFS@graphene nanomaterials (Fe-CFS@C) with triple reaction interfaces. As the 1st interface, graphene can decrease their electrical resistance. At the 2nd interface, partial substitution of Co atoms in CoS2 by Fe single atoms can reduce its band gap and boost the potassium ion (K+) diffusion rate. At the 3rd interface, anchoring Fe clusters on the surface of CoS2 results in the formation of Schottky junction and promotes the formation of built-in electric fields, which accelerates the K+ insertion/extraction kinetics and depresses the dynamic polarization. Acting as anode for K+ battery, Fe-CFS@C exhibits a high reversible capacity of 755.8 mA h g−1 at 0.05 A g−1. Even at 10 A g−1, it can maintain 178.3 mA h g−1 over 4000 cycles due to the greatly enhanced electrochemical reaction kinetics and effectively improved structural stability.

语种： 英文

作者： Wang, Zhihui;Wang, Yanfei;Yao, Chen

期刊： Journal of Polymers and the Environment,2022年30(3):855-866 ISSN：1566-2543

通讯作者： Yanfei Wang

作者机构： [Wang, Zhihui; Yao, Chen; Wang, Yanfei] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

通讯机构： [Yanfei Wang] S;School of Chemistry and Chemical Engineering, University of South China, Hengyang, People’s Republic of China

关键词： Chemicals removal (water treatment);Chitosan;Crosslinking;Iron oxides;Magnetism;Magnetite;Sodium compounds;Uranium compounds;Adsorption capacities;Cross linking agents;Dubinin-Radushkevich;Environmental-friendly;Pseudo-second order model;Single-factor experiments;Sodium polyphosphate;Thermodynamic studies;Adsorption;adsorption;aqueous solution;concentration (composition);experimental study;polymer;uranium

摘要： In this study, Polyethyleneimine modified magnetic chitosan (MCS-PEI) was synthesized by grafting polyethyleneimine onto chitosan and adding magnetic Fe3O4 with sodium polyphosphate as crosslinking agent. The structure of the prepared material was characterized by FT-IR, SEM, EDS, XRD and XPS, which showed MCS-PEI was successfully synthesized. After a series of single factor experiments, the adsorption data fitted well with the Langmuir model (R2 = 0.99), being the maximum adsorption capacity equal 181.8mg g−1. The pseudo-second-order model (R2 = 0.997) and Dubinin-Radushkevich model (R2 = 0.9598) indicated that the adsorption process was chemical adsorption. And thermodynamic studies showed that the adsorption was spontaneous and exothermic. The adsorption rate decreased by no more than 4% after the four adsorption–desorption experiments. This work illustrates that MCS-PEI is an environmental friendly, efficient and low-cost adsorbent. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

语种： 英文

作者： 李鸿峥;许玉芬;王延飞

期刊： 中国有色冶金,2022年51(05):15-22,31 ISSN：1672-6103

作者机构： 南华大学化学化工学院,湖南衡阳 421001;[李鸿峥; 王延飞; 许玉芬] 南华大学

关键词： 锂离子电池;超高镍正极材料;容量衰退;材料改性;元素掺杂;表面包覆;形态设计;晶体设计

摘要： 超高镍正极材料作为富镍层状氧化物正极材料的发展方向之一，因为其具有较高的比容量和成本的降低，有望成为下一代锂离子电池正极材料，特别是有利于解决电动汽车的续航与动力问题。超高镍正极材料镍含量最高，一方面可以提高能量密度但另一方面其循环性能与热稳定性随之恶化。因此，有必要针对超高镍带来的问题，分析材料结构与电化学性能的互相关系，并通过合理的改性手法来提高超高镍正极材料的稳定性。从原子尺度到宏观尺度，以最新的研究进展，简单的概括容量衰退机理，重点分析改进策略，并对其未来的发展方向进行了展望。

语种： 中文

作者： Meixue Xu;Pei Tian;Jing Wen;Yang Yang;Yanfei Wang

期刊： E3S Web of Conferences,2021年290:03006-null ISSN：2555-0403

通讯作者： Xu, M.

作者机构： [Xu M.; Wen J.; Yang Yang; Tian P.; Wang Y.] School of chemistry and chemical engineering, University of South China421000, China

通讯机构： [Xu, M.] S;School of chemistry and chemical engineering, China

会议名称： 2021 3rd International Conference on Geoscience and Environmental Chemistry, ICGEC 2021

会议时间： 18 June 2021 through 20 June 2021

摘要： Cyclo crosslinked polyphosphazenes (PPNs) were prepared by Hexachlorocyclotriphosphazene (HCCP) with unique P = n structure and active p-cl group and green compound phloretin. The synthesis pro cess of polyphosphazene nanospheres with Hexachlorocyclotriphosphazene as the main body and phloretin was discussed. The effects of pH value and solid-liquid ratio of solution on the adsorption of uranium by pol yphosphazene nanospheres were studied. The results show that polyphosphazene nanospheres are off white powder in appearance and spherical in microstructure. When the pH value ofthe solution is 4 and the solid-l iquid ratio is 0.5g • L - 1, the maximum adsorption rate of uranium is obtained. © The Authors, published by EDP Sciences.

语种： 英文

作者： Wang, Zhihui;Wang, Yanfei;Yao, Chen

期刊： Journal of Radioanalytical and Nuclear Chemistry,2021年330(1):113-125 ISSN：0236-5731

通讯作者： Yanfei Wang

作者机构： [Wang, Zhihui; Yao, Chen; Wang, Yanfei] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

通讯机构： [Yanfei Wang] S;School of Chemistry and Chemical Engineering, University of South China, Hengyang, People’s Republic of China

关键词： adsorbent;chitosan;cross linking reagent;hexachlorocyclotriphosphazene;inorganic compound;polyphosphate;unclassified drug;uranium;absorption;adsorption;aqueous solution;Article;controlled study;energy dispersive X ray spectroscopy;Fourier transform infrared spectroscopy;pH;scanning electron microscopy;synthesis;thermodynamics;waste component removal;X ray photoemission spectroscopy

摘要： In this work, a new material containing chitosan(CS)-hexachlorocyclotriphosphazene (HP) composite was synthesized with polyphosphoric acid as the cross-linking agent for the effective removal of uranium(VI) from aqueous solution. The prepared material was characterized by FTIR, EDS, SEM, BET and XPS. According to batch experiments, its adsorption equilibrium (Qe = 398.8mgg−1) was reached within 50min at pH 6.0. The adsorption process could be well fitted to the pseudo-second-order model and the Langmuir model. The thermodynamic analysis indicated that the adsorption was an exothermic and spontaneous process. Furthermore, the CS-HP has superior absorption reusability. This study proved that CS-HP could be considered as the highly efficient and sustainable material for removal of uranium(VI) from aqueous solution. © 2021, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文

作者： Meixue Xu;Kaifa Liao;Mouwu Liu;Yi Tan;Yanfei Wang

期刊： E3S Web of Conferences,2021年290:03021 ISSN：2555-0403

通讯作者： Xu, M.

作者机构： [Xu M.; Tan Y.; Wang Y.; Liu M.; Liao K.] School of Chemistry and Chemical Engineering, University of South China421000, China

通讯机构： [Xu, M.] S;School of Chemistry and Chemical Engineering, China

会议名称： 2021 3rd International Conference on Geoscience and Environmental Chemistry, ICGEC 2021

会议时间： 18 June 2021 through 20 June 2021

关键词： conference;proceedings;environment;energy;earth sciences

摘要： Poly (cyclotriphosphazene-co-4,4 '- diaminodiphenylsulfone) (PZD) microspheres were synthesi zed by precipitation polymerization of Hexachlorocyclotriphosphazene (HCCP) and polyfunctional organic monomers. The products were characterized by FTIR, SEM-EDS, XPS and bet. The adsorption behavior of PZD microspheres for uranium (VI) in aqueous solution and the influence of adsorption behavior were disc ussed. The results show that the PZD microspheres have a certain adsorption capacity for uranium (VI) in a queous solution. When pH = 3.5, adsorption time is 6h, solid-liquid ratio is 2.0g • L-1 and initial concentra tion of uranium (VI) is 30mg • L - 1, the adsorption rate of uranium reaches the maximum. © The Authors, published by EDP Sciences.

语种： 英文

作者： 王智慧;陈飞;张震;李玉文;王延飞;...

期刊： 首都师范大学学报(自然科学版),2021年42(05):45-52 ISSN：1004-9398

作者机构： [陈飞; 王雪涛; 张震; 李玉文] 国家卫生健康委职业安全卫生研究中心;[王延飞] 南华大学化学化工学院;[王智慧] 国家卫生健康委职业安全卫生研究中心<&wdkj&>南华大学化学化工学院

关键词： 环境和生物样品;预处理;样品制备;测量分析

摘要： 为了系统地了解环境和生物样品中碳?14(14C)的测量方法,明确各种方法可能存在的优缺点,本文在比较国内测量方法的基础上,对14C测量方法体系进行了深入的探索,讨论了基于不同体系样品预处理相关的沉淀法、鼓泡法、高温燃烧氧化法、湿法氧化法、氧化燃烧法和氧弹燃烧法等,基于样品制备相关的粉末悬浮法、直接吸收法、苯合成法和石墨法等,基于样品测量方法相关的液闪β放射性计数法和加速器质谱法等,系统地分析了不同方法存在的问题并提出解决方案,希冀能以此提高实验室技术人员对分析方法的理解,提高我国环境和生物样品中14C测量水平.

语种： 中文

作者： Xiong, Zeng;Wang, Yanfei;Xie, Xiaoqing;Li, Honzheng;Yao, Chen

期刊： HETEROCYCLES,2021年102(2):231-244 ISSN：0385-5414

作者机构： [Xiong, Zeng; Wang, Yanfei; Xie, Xiaoqing; Li, Honzheng; Yao, Chen] School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan, 421001, China

摘要： The cyclomatrix phosphazenes-co-3,3'-sulfonyldianiline PSD-NH2 microspheres with active amino groups on the surface were prepared by precipitation which was used to removal organic dyes from aqueous solution. The synthesized amino cyclomatrix phosphazenes (PSD-NH2) microspheres were characterized by FT-IR, SEM, XPS and XRD. The effects of different pH, sorbent dosage, contact time, initial Congo red (CR) concentration and different temperature on the adsorption of Congo red by the cross-linked microspheres were studied. The experimental data show that the adsorption capacity of PSD-NH2 microspheres on Congo red reaches 186.70 mg/g under the optimal adsorption conditions. It conforms to the pseudo-second-order kinetic equation and Langmuir isotherm model. The selective adsorption mechanism for Congo red dye can be summarized as intermolecular electrostatic interaction, hydrogen bond between PSD-NH2 microspheres adsorbed on the surface and Congo red, π-π and C-H…π stacking and other molecular forces. Thermodynamic studies have shown that the adsorption of Congo redon PSD-NH2 microspheres is endothermic and spontaneous in nature. Thus, amino polyphosphazene (PSD-NH2) microspheres have excellent adsorptionperformance for Congo red. © 2021 The Japan Institute of Heterocyclic Chemistry

语种： 英文

作者： Xie, Xiaoqing;Wang, Yanfei;Zhou, Weini;Chen, Can;Xiong, Zeng

期刊： Journal of Solid State Chemistry,2021年296:121966 ISSN：0022-4596

通讯作者： Yanfei Wang

作者机构： [Xiong, Zeng; Xie, Xiaoqing; Zhou, Weini; Chen, Can; Wang, Yanfei] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Yanfei Wang] S;School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China

关键词： Chlorine compounds;Thermoanalysis;Wastewater treatment;X ray photoelectron spectroscopy;Adsorption capacities;Adsorption efficiency;Adsorption properties;BET specific surface area;Langmuir adsorption isotherms;Mesoporous structures;Pseudo-second-order kinetic models;Thermo dynamic analysis;Adsorption

摘要： A new synthetic method was designed to prepare poly (trimesoyl chloride-co-polyethyleneimine) (PEI-TMC). Characterization of PEI-TMC was investigated by FTIR, SEM, EDS, XPS, TGA, and BET. TGA test revealed that the PEI-TMC had excellent thermal stability. The BET specific surface area (4.74 ​m2 ​g−1) and pore diameter of about 9.44 ​nm indicated that PEI-TMC possessed a mesoporous structure. The adsorption behavior of U(VI) on the PEI-TMC was investigated. The thermodynamic analysis showed that the process of PEI-TMC adsorption of U(VI) was endothermic and spontaneous, and the adsorption efficiency was better at higher temperatures. The U(VI) sorption on PEI-TMC was conformed to the Langmuir adsorption isotherm and pseudo-second-order kinetic models. The adsorption mechanism of U(VI) with PEI-TMC was systematically elucidated by XPS and FTIR. Under the best condition, the maximum adsorption capacity of PEI-TMC could reach 212.8 ​mg ​g−1 ​by calculating the Langmuir isothermal model. It indicated that PEI-TMC was a potential adsorbent for the treatment of U(VI)-containing wastewater. © 2021

语种： 英文

作者： 熊曾;王延飞;谢晓庆

期刊： 山东化工,2021年50(02):54-57 ISSN：1008-021X

作者机构： 南华大学 化学化工学院,湖南 衡阳 421000;[熊曾; 王延飞; 谢晓庆] 南华大学

关键词： 磷腈聚合物;钍(Ⅳ)离子;微球;吸附

摘要： 采用一步沉淀聚合法制备聚（环三磷腈-co-3,3’-磺酰二苯胺）环交联微球,通过FTIR、SEM-EDS和XPS对PSD微球进行表征,研究了不同p H值、投加量、时间和温度对聚合物吸附钍离子的影响。实验数据表明,在pH值=4.0,时间为20 min,最大吸附量为163.1 mg/g,去除率为94.6%,且吸附进程符合拟二级动力学模型和Langmuir等温模型。

语种： 中文

作者： Wang, Zhihui;Wang, Yanfei;Yao, Chen

期刊： Journal of Radioanalytical and Nuclear Chemistry,2021年330(3):1263-1269 ISSN：0236-5731

作者机构： [Wang, Zhihui; Yao, Chen; Wang, Yanfei] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

关键词： chitosan;uranium;adsorption;Article;blending;chemical modification;chemical phenomena;chemical procedures;cross linking;grafting;ion imprinting;magnetism;magnetization;mechanical strength;physical parameters;research;selectivity;separation technique;stability;strength;wastewater;water contamination

摘要： With the continuous development of the nuclear industry, the amount of uranium containing wastewater discharged from the production process is increasing, which poses a great threat to the environment and human health. Therefore, it is an urgent task to find safe, environmentally friendly and efficient water treatment agents. Based on its unique molecular structure, chitosan can chemically react with anion system to adsorb pollutants, which has attracted the attention of scholars in the field of water treatment. However, the poor mechanical and adsorption properties of chitosan and the difficulty of recovery limit its development. To overcome the above shortcomings, chitosan is usually modified. In this paper, several modification methods of chitosan, including blending, crosslinking, grafting, ion imprinting and magnetization modification, are systematically described, and the advantages and disadvantages of different modification methods are analyzed. The application of modified chitosan adsorbent in uranium(VI) containing wastewater treatment is also introduced. Finally, the development trend of chitosan adsorbent in wastewater treatment is prospected. © 2021, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文

作者： Luo, Yige;Yao, Liping;Gu, Wen;Xiao, Chengyi;Liao, Hailiang;...

期刊： Organic Electronics,2020年85:105895 ISSN：1566-1199

通讯作者： Wang, Yanfei;Li, Zhengke;Yue, Wan;Lv, Aifeng

作者机构： [Luo, Yige; Wang, Yanfei] Univ South China, Coll Chem & Chem Engn, Hengyang, Hunan, Peoples R China.;[Yue, Wan; Liao, Hailiang; Li, Zhengke; Yao, Liping; Li, ZK; Luo, Yige] Sun Yat Sen Univ, Key Lab Polymer Composite & Funct Mat, Minist Educ, Sch Mat Sci & Engn, Guangzhou 510275, Peoples R China.;[Gu, Wen] Shanghai Univ Engn Sci, Coll Chem & Chem Engn, 333 Longteng Rd, Shanghai 201620, Peoples R China.;[Xiao, Chengyi; Zhang, Lei] Beijing Univ Chem Technol, Coll Energy, Beijing 100029, Peoples R China.;[Ravva, Mahesh Kumar; Lv, Aifeng] SRM Univ AP, Dept Chem, Amaravati 522502, India.

通讯机构： [Wang, Yanfei] U;[Li, ZK; Yue, W; Lv, Aifeng] S;Univ South China, Coll Chem & Chem Engn, Hengyang, Hunan, Peoples R China.;Sun Yat Sen Univ, Key Lab Polymer Composite & Funct Mat, Minist Educ, Sch Mat Sci & Engn, Guangzhou 510275, Peoples R China.;SRM Univ AP, Dept Chem, Amaravati 522502, India.

关键词： Carrier transport;Halogenation;Ionization potential;Naphthalene;Organic polymers;Acid-catalyzed condensation;Ambipolar charge transports;Conjugated backbones;Electronic and optical properties;Halogen groups;P-type;Transport behavior;Optical properties

摘要： We systematically designed and developed three novel halogenated aza-octacene derivatives, which have the same π-conjugated backbone with different terminal halogen groups (F, Cl, Br). These aza-octacene derivatives are synthesized by acid-catalyzed condensation of naphthalene-bisisatin with 4,5-dihalo-1,2-phenylenediamine. The in-depth experimental and theoretical analyses on these molecules, using the non-halogenated system as a reference, allowed us to understand the impact of halogenation on electronic and optical properties. Both electronic affinity (EA) and ionization potential (IP) are increased through peripheral halogen substitution. Chlorination enhances the EA more effectively compared with fluorination and bromination. Micro-crystal devices based on the bromine substituted aza-octacene derivative show only p-type charge transport behavior. In contrast, the chlorinated and the fluorinated aza-octacene derivatives exhibit ambipolar charge transport. © 2020 Elsevier B.V.

语种： 英文

作者： Xie, Xiaoqing;Wang, Yanfei*;Xiong, Zeng;Li, Hongzheng;Yao, Chen

期刊： Journal of Radioanalytical and Nuclear Chemistry,2020年326(3):1867-1877 ISSN：0236-5731

通讯作者： Wang, Yanfei

作者机构： [Xiong, Zeng; Yao, Chen; Xie, Xiaoqing; Li, Hongzheng; Wang, Yanfei] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

通讯机构： [Wang, Yanfei] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

关键词： microsphere;poly(cyclotriphosphazene co polyethyleneimine)microsphere;unclassified drug;uranium;adsorption;aqueous solution;Article;chemical structure;complex formation;energy dispersive X ray spectroscopy;Fourier transform infrared spectroscopy;pH;polymerization;precipitation;scanning electron microscopy;separation technique;surface property;synthesis;thermodynamics;transmission electron microscopy

摘要： Poly(cyclotriphosphazene-co-polyethyleneimine) microspheres with the solid structure were synthesized by precipitation polymerization method for the separation of highly toxic uranium(VI). The structure and morphology of the prepared microspheres were analyzed via FTIR, SEM–EDS, TEM and BET. The optimal adsorption conditions were also investigated, and the maximum adsorption capacity was 274.2mgg−1. The experimental results showed that the adsorption kinetics conformed to the pseudo-second-order kinetics and was in good agreement with the Langmuir adsorption isotherm model. Removal of uranium(VI) ions was achieved by the complexation between the amino groups on the adsorbent and uranyl ions. © 2020, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文

作者： Ma, Zhili;Wang, Yanfei*;Luo, Yige;Xie, Xiaoqing;Xiong, Zeng

期刊： Journal of Radioanalytical and Nuclear Chemistry,2020年323(2):993-1002 ISSN：0236-5731

通讯作者： Wang, Yanfei

作者机构： [Xiong, Zeng; Xie, Xiaoqing; Wang, Yanfei; Luo, Yige; Ma, Zhili] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

通讯机构： [Wang, Yanfei] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.

关键词： microsphere;poly(cyclotriphosphazene co melamine) microsphere;thorium;unclassified drug;adsorption;aqueous solution;Article;concentration (parameter);environmental temperature;experimental study;heavy metal removal;kinetics;room temperature;synthesis;thermodynamics

摘要： Highly crosslinked organic–inorganic hybrid polymer poly(cyclotriphosphazene-co-melamine) microspheres (PZM) were synthesized by a simple method. The microspheres was characterized by FTIR, SEM and EDX. It was applied to eliminate thorium(IV) from aqueous solution under various conditions, i.e., pH, initial concentration, dosage and contact time. The experimental data were well-imitated via the pseudo-second-order kinetic model and its adsorption processes comply with the Langmuir isotherm model. Adsorption thermodynamic studies demonstrated that the adsorption process, in essence, was spontaneous and endothermic. Furthermore, the maximum experimental adsorption capacity was 98.6mgg−1 for initial thorium(IV) concentration 50mg L−1. When pH = 0.0, the thorium(IV) removal efficiency reached at 76.9%, which indicates that the adsorbent can also was used in a peracid environment. Adsorption behavior of thorium(IV) onto the microspheres were weakly affected via temperature, implying that adsorption would be done at room temperature. © 2019, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文