| 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,(2):68-77 |
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| 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 |
| 投稿时间：2024-07-10 修订日期：2024-08-21 |
| DOI：10.11981/j.issn.1000-6842.2025.02.68 |
| 中文关键词: 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） |
| 基金项目:福建省自然科学基金（2023J05103）；福建省中青年教师教育科研项目（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）。 |
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| 中文摘要: |
| 以纤维素为原料，通过交联反应引入橡椀单宁，制备单宁-纤维素复合气凝胶（VTCA），再通过酯化反应在VTCA结构上引入巯基，制备巯基化改性纤维素复合气凝胶（TVTCA），分析吸附还原Ag（Ⅰ）前后TVTCA的理化性质变化，考察其对水体中Ag（Ⅰ）的吸附还原效果，并探讨吸附还原作用机理。结果表明，吸附还原Ag（Ⅰ）后，TVTCA的孔隙结构坍塌，巯基和酚羟基与Ag（Ⅰ）发生了吸附还原作用；在pH值=5的最佳吸附条件下，TVTCA对Ag（Ⅰ）的平衡吸附量达111.67 mg/g；吸附符合准二级动力学模型和Langmuir等温吸附模型，是单分子层的化学吸附过程，属于放热反应。水体中共存离子的影响分析表明，引入巯基后，TVTCA的吸附选择性增强；TVTCA对Ag（Ⅰ）的吸附还原是静电吸引、螯合作用和还原反应的协同效果，其通过静电吸引及巯基和酚羟基的螯合作用将Ag（Ⅰ）吸附并固定至纤维素基气凝胶表面，通过单宁酚羟基将85.79%的Ag（Ⅰ）还原为Ag0。 |
| 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 adsorption-reduction were analyzed， the adsorption-reduction effect of TVTCA on Ag（Ⅰ） in water was investigated， and the mechanism was discussed. 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 equilibrium 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. Additionally， 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 phenolic hydroxyl group， and 85.79% of Ag（Ⅰ） was reduced to Ag0 through phenolic hydroxyl group from tannin. |
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