中国造纸学报2025，Vol.40Issue(2)：68-77,10.DOI:10.11981/j.issn.1000-6842.2025.02.68
巯基化改性纤维素复合气凝胶吸附还原Ag(Ⅰ)的研究
Study on Adsorption-Reduction of Ag(Ⅰ)by Composite Aerogel Based on Cellulose with Thiol-modification
摘要
Abstract
Valonea tannin-cellulose composite aerogel(VTCA)was prepared by introducing valonea tannin through cross-linking reaction with cellulose as the raw material,and then the thiol-modified cellulose-based composite aerogel(TVTCA)was synthesized by introducing thiol functional group on VTCA through esterification reaction.The physicochemical properties changes of TVTCA before and after adsorp-tion-reduction were analyzed,the adsorption-reduction effect of TVTCA on Ag(Ⅰ)in water was investigated,and the mechanism was dis-cussed.The results showed that after the adsorption-reduction of Ag(Ⅰ),the pore structure of TVTCA collapsed,as well as the thiol group and phenolic hydroxyl group underwent adsorption-reduction with Ag(Ⅰ).Under the optimum adsorption conditions of pH value=5,the equilibri-um adsorption capacity of TVTCA for Ag(Ⅰ)reached 111.67 mg/g.The adsorption was consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model.It was a chemical adsorption process with monolayer adsorption,which belongs to exothermic reaction.Ad-ditionally,the influence analysis of coexisting ions in water showed that the adsorption selectivity of TVTCA was enhanced after the introduction of thiol groups.The adsorption of Ag(Ⅰ)by TVTCA was a synergistic action of electrostatic attraction,chelation adsorption and reduction.Ag(Ⅰ)was adsorbed and fixed to the cellulose-based aerogel surface of TVTCA through electrostatic attraction and chelation of—SH and phe-nolic hydroxyl group,and 85.79%of Ag(Ⅰ)was reduced to Ag0 through phenolic hydroxyl group from tannin.关键词
复合气凝胶/巯基化改性/吸附还原/纤维素/Ag(Ⅰ)Key words
composite aerogel/thiol-modification/adsorption-reduction/cellulose/Ag(Ⅰ)分类
轻工纺织引用本文复制引用
刘以凡,林昱灵,陈颖,黄靖文,吕源财,林春香,叶晓霞,刘明华..巯基化改性纤维素复合气凝胶吸附还原Ag(Ⅰ)的研究[J].中国造纸学报,2025,40(2):68-77,10.基金项目
福建省自然科学基金(2023J05103) （2023J05103）
福建省中青年教师教育科研项目(JAT210005) （JAT210005）
生态环境及其信息图谱福建省高等学校重点实验室开放课题(ST24001). （ST24001）
