吸附
铀酰
萃取(化学)
化学
吸附
海水
化学工程
化学吸附
X射线光电子能谱
单层
聚合
朗缪尔吸附模型
铀
自愈水凝胶
核化学
聚合物
高分子化学
材料科学
色谱法
有机化学
离子
工程类
生物化学
海洋学
冶金
地质学
作者
Xu Zhang,Dongxiang Zhang,Dagang Li,Shusen Chen,Fengqi Zhang,Zilei Zhang,Haocun Tan,Lina Yang,Jinsong Hou,Rui Tan,Jinying Li,Xiyan Xu
标识
DOI:10.1016/j.seppur.2024.127485
摘要
Carboxymethylcellulose-based zwitterionic cryogels (AO-PAM/CMC) with a supermacroporous pore structure were prepared through cryo-polymerization and post-modification strategies. The hydrogel ex-hibited a supermacroporous structure, excellent hydrophilicity, superior mechanical properties, and resistance to biological contamination. Through a comprehensive investigation of the U(VI) adsorption process, it was observed that the AO-PAM/CMC hydrogel was predominantly char-acterized by chemisorption, wherein uranyl ions were adsorbed on the surface in the form of a monolayer. Under the conditions of 45 °C and pH = 5.0, the hydrogel demonstrated remarkable adsorption performance, with the maximum adsorption capacity reaching 1223.6 mg∙g−1, showcasing a high degree of selectivity for U(VI). In real seawater, the hydrogel's ad-sorption capacity for uranium reached 12.95 mg∙g−1 after 25 days of expo-sure, with the adsorption equilibrium being essentially reached in about 10 days. The adsorption mechanism of U(VI) by the hydrogel was confirmed through XPS spectroscopy and DFT calculations. The synergistic interplay between guanidino and zwitterionic moieties within the AO-PAM/CMC hydrogel enhanced U(VI) adsorption capacity and facilitated rapid urani-um extraction from seawater. (UES). Therefore, the AO-PAM/CMC hy-drogel presents a novel solution to address the inefficiencies of existing technologies for uranium extraction from seawater, contributing an innovative approach to the sustain-able development of nuclear energy.
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