纳米纤维素气凝胶用于从水溶液中高效吸附铀（VI）。
Nanocellulose aerogel for highly efficient adsorption of uranium (VI) from aqueous solution.
机构信息
Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.
出版信息
Carbohydr Polym. 2021 Sep 1;267:118233. doi: 10.1016/j.carbpol.2021.118233. Epub 2021 May 21.
Cellulose nanofibers (CNFs) aerogel was prepared via simple covalent crosslinking and freeze-drying method. The porous cellulose aerogel possessed high specific surface area and high metal-chelating capacity, which showed fast adsorption kinetics and high adsorption capacity (440.60 mg g) in static uranium adsorption process. In the dynamic filtration system, the maximum adsorption capacity reached 194 mg g with the initial concentration of 10 mg L. In addition, the CNFs aerogel possessed excellent selectivity and good regeneration ability for uranium adsorption. The integrated analyses of attenuated total reflection Fourier transform infrared (ATR-FTIR), X-Ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS) suggested that the predominant UO species formed inner-sphere surface complexes with two active carboxyl groups in the coordination model. This strategy may provide a sustainable route for development of efficient biomass-based adsorbents for selective uranium removal from aqueous solution.
纤维素纳米纤维（CNFs）气凝胶通过简单的共价交联和冷冻干燥方法制备。多孔纤维素气凝胶具有高比表面积和高金属螯合能力，在静态铀吸附过程中表现出快速的吸附动力学和高吸附容量（440.60 mg g）。在动态过滤系统中，初始浓度为 10 mg L 时，最大吸附容量达到 194 mg g。此外，CNFs 气凝胶对铀吸附具有优异的选择性和良好的再生能力。衰减全反射傅里叶变换红外（ATR-FTIR）、X 射线光电子能谱（XPS）和扩展 X 射线吸收精细结构（EXAFS）的综合分析表明，UO 主要物种在配位模型中与两个活性羧基形成内球表面配合物。该策略可能为开发高效的基于生物质的吸附剂提供一条可持续的途径，用于从水溶液中选择性去除铀。
Zotero 插件