Nanocellulose aerogel for highly efficient adsorption of uranium (VI) from aqueous solution
Nanocellulose aerogel for highly efficient adsorption of uranium (VI) from aqueous solution
复制标题
DOI：
10.1016/j.carbpol.2021.118233
复制
发表时间：
2021-05-25
影响因子：
11.2
通讯作者：
Li, Wangliang
中科院分区：
文献类型：
--
作者：
Wang, Ying;Li, Yanxiang;Li, Wangliang
采用简单的共价交联法和冷冻干燥法制备了纤维素纳米纤维气凝胶。多孔纤维素气凝胶具有高的比表面积和高的金属螯合容量，在静态吸附铀过程中表现出快速的吸附动力学和高的吸附容量（440.60 mg g-1）。在动态过滤系统中，当初始浓度为10 mg L-1时，最大吸附量可达194 mg g-1。此外，CNFs气凝胶对铀的吸附具有良好的选择性和再生能力。衰减全反射傅里叶变换红外光谱（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，在配位模型中，UO 22+的主要物种与两个活性羧基形成了内球表面络合物。这一策略可能为开发高效的生物质基吸附剂从水溶液中选择性去除铀提供一条可持续的途径。
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-1) in static uranium adsorption process. In the dynamic filtration system, the maximum adsorption capacity reached 194 mg g-1 with the initial concentration of 10 mg L-1. 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 UO22+ 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.