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| Study on Adsorption-Reduction of Ag(Ⅰ) by Composite Aerogel Based on Cellulose with Thiol-modification |
| Received:July 10, 2024 Revised:August 21, 2024 |
| DOI：10.11981/j.issn.1000-6842.2025.02.68 |
| Key Words:composite aerogel;thiol-modification;adsorption-reduction;cellulose;Ag（Ⅰ） |
| Fund Project: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）。 |
| Author Name | Affiliation | Postcode | | LIU Yifan* | College of Environmental and Safety Engineering， Fuzhou University， Fuzhou， Fujian Province， 350116 | 350116 | | LIN Yuling | College of Environmental and Safety Engineering， Fuzhou University， Fuzhou， Fujian Province， 350116 | 350116 | | CHEN Ying | College of Environmental and Safety Engineering， Fuzhou University， Fuzhou， Fujian Province， 350116 | 350116 | | HUANG Jingwen | School of Advanced Manufacturing， Fuzhou University， Jinjiang， Fujian Province， 362251 | 362251 | | LYU Yuancai | College of Environmental and Safety Engineering， Fuzhou University， Fuzhou， Fujian Province， 350116 | 350116 | | LIN Chunxiang | College of Environmental and Safety Engineering， Fuzhou University， Fuzhou， Fujian Province， 350116 | 350116 | | YE Xiaoxia | College of Environmental and Safety Engineering， Fuzhou University， Fuzhou， Fujian Province， 350116 | 350116 | | LIU Minghua* | College of Environmental and Safety Engineering， Fuzhou University， Fuzhou， Fujian Province， 350116
College of Environmental and Biological Engineering， Putian University， Putian， Fujian Province， 351100 | 351100 |
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| 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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