U(VI) adsorption behavior onto polypyrrole coated 3R-MoS2 nanosheets prepared with the molten salt electrolysis method
U(VI) adsorption behavior onto polypyrrole coated 3R-MoS2 nanosheets prepared with the molten salt electrolysis method
复制标题
熔盐电解法制备的聚吡咯涂覆的3R-MoS2纳米片对U(VI)的吸附行为
DOI：
10.1007/s12613-020-2154-5
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Yunhai Liu
中科院分区：
文献类型：
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作者：
Yuhui Liu;Meng Tang;Shuang Zhang;Yuling Lin;Yingcai Wang;Youqun Wang;Ying Dai;Xiaohong Cao;Zhibin Zhang;Yunhai Liu
为提高水溶液中铀的分离性能，采用熔盐电解法制备了3R-MoS 2纳米片，并对其进行聚吡咯（PPy）修饰，制备了PPy/3R-MoS 2复合纳米吸附剂。研究了PPy/3R-MoS 2纳米片的制备条件，并采用扫描电镜（SEM）、高分辨透射电镜（HRTEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）等手段对PPy/3R-MoS 2纳米片进行表征。结果表明，PPy/3R-MoS 2对U（VI）的吸附量比纯3R-MoS 2和PPy高，最大吸附量为200.4 mg/g。XPS和FTIR分析表明，PPy/3R-MoS 2纳米片对U（VI）的吸附机理为：（1）带负电荷的PPy/3R-MoS 2纳米片通过静电相互作用吸附UO 22 +;（2）裸露的C、N、Mo和S原子通过配位作用与U（VI）形成络合物;（3）络合物中的Mo将U（VI）部分还原为U（IV），使吸附点再生，继续吸附U（VI）。PPy/3R-MoS 2复合材料的设计具有较高的吸附容量和化学稳定性，为放射性核素的去除提供了新的方向。
To improve the separation capacity of uranium in aqueous solutions, 3R-MoS2 nanosheets were prepared with molten salt electrolysis and further modified with polypyrrole (PPy) to synthesize a hybrid nanoadsorbent (PPy/3R-MoS2). The preparation conditions of PPy/3R-MoS2 were investigated and the obtained nanosheets were characterized with scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS). The results showed that PPy/3R-MoS2 exhibited enhanced adsorption capacity toward U(VI) compared to pure 3R-MoS2 and PPy; the maximum adsorption was 200.4 mg/g. The adsorption mechanism was elucidated with XPS and FTIR: (1) negatively charged PPy/3R-MoS2 nanosheets attracted UO22+ by an electrostatic interaction; (2) exposed C, N, Mo, and S atoms complexed with U(VI) through coordination; (3) Mo in the complex partly reduced the adsorbed U(VI) to U(IV), which further regenerated the adsorption point and continuously adsorbed U(VI). The design of the PPy/3R-MoS2 composite with a high adsorption capacity and chemical stability provides a new direction for the removal of radionuclide.