吸附
普鲁士蓝
纳米颗粒
离子交换
弗伦德利希方程
纳米纤维
化学
化学工程
核化学
无机化学
离子
材料科学
有机化学
纳米技术
电极
物理化学
工程类
电化学
作者
Shouhua Feng,Jingshuai Gao,Shouzhu Li,Xun Cao,Jie Ni,Xiuli Yue,Wei Zheng,Yuyao Li,Xueqi Hu,Yao Zhang,Si‐Shen Feng
标识
DOI:10.1016/j.jes.2023.05.013
摘要
To improve the selective separation performance of silica nanofibers (SiO2 NFs) for cesium ions (Cs+) and overcome the defects of Prussian blue nanoparticles (PB NPs), PB/SiO2-NH2 NFs were prepared to remove Cs+ from water. Among them, 3-aminopropyltriethoxysilane (APTES) underwent an alkylation reaction with SiO2, resulting in the formation of a dense Si-O-Si network structure that decorated the surface of SiO2 NFs. Meanwhile, the amino functional groups in APTES combined with Fe3+ and then reacted with Fe2+ to form PB NPs, which anchored firmly on the aminoated SiO2 NFs surface. In our experiment, the maximum adsorption capacity of PB/SiO2-NH2 NFs was 111.38 mg/g, which was 31.5 mg/g higher than that of SiO2 NFs. At the same time, after the fifth cycle, the removal rate of Cs+ by PB/SiO2-NH2 NFs adsorbent was 75.36% ± 3.69%. In addition, the adsorption isotherms and adsorption kinetics of PB/SiO2-NH2 NFs were combined with the Freundlich model and the quasi-two-stage fitting model, respectively. Further mechanism analysis showed that the bond between PB/SiO2-NH2 NFs and Cs+ was mainly a synergistic action of ion exchange, electrostatic adsorption and membrane separation.
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