U(VI) adsorption behavior onto polypyrrole coated 3R-MoS<sub>2</sub> nanosheets prepared with the molten salt electrolysis method

Yuhui Liu; Meng Tang; Shuang Zhang; Yuling Lin; Yingcai Wang; Youqun Wang; Ying Dai; Xiaohong Cao; Zhibin Zhang; Yunhai Liu

doi:10.1007/s12613-020-2154-5

Volume 29 Issue 3

Mar. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(3): 479-489

Yuhui Liu, Meng Tang, Shuang Zhang, Yuling Lin, Yingcai Wang, Youqun Wang, Ying Dai, Xiaohong Cao, Zhibin Zhang, and Yunhai Liu, U(VI) adsorption behavior onto polypyrrole coated 3R-MoS₂ nanosheets prepared with the molten salt electrolysis method, Int. J. Miner. Metall. Mater., 29(2022), No. 3, pp. 479-489. https://doi.org/10.1007/s12613-020-2154-5

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Yuhui Liu, Meng Tang, Shuang Zhang, Yuling Lin, Yingcai Wang, Youqun Wang, Ying Dai, Xiaohong Cao, Zhibin Zhang, and Yunhai Liu, U(VI) adsorption behavior onto polypyrrole coated 3R-MoS2 nanosheets prepared with the molten salt electrolysis method, Int. J. Miner. Metall. Mater., 29(2022), No. 3, pp. 479-489. https://doi.org/10.1007/s12613-020-2154-5

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Research Article

U(VI) adsorption behavior onto polypyrrole coated 3R-MoS₂ nanosheets prepared with the molten salt electrolysis method

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Corresponding authors:
Yuhui Liu E-mail: liuyuhui@ecut.edu.cn

Yunhai Liu E-mail: walton_liu@163.com
Received: 18 June 2020; Revised: 23 July 2020; Accepted: 27 July 2020; Available online: 30 July 2020

Abstract

Abstract

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 $ {\rm{UO}}_2^{2 + } $ 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.
- molten salt electrolysis;
- 3R-MoS₂ nanosheets;
- polypyrrole modification;
- adsorption;
- uranium

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