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Ammonium molybdophosphate functionalized copolymer micelles for efficient Cs+ adsorption

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Abstract

The ammonium molybdophosphate (AMP) with excellent ability of separation and extraction for radioisotope 137Cs and Cs+ in saline has a high solubility in water, which avoids its adsorbent role to extract Cs+ from enhydrous solutions directly. In our paper, the copolymers as the carrier of AMP are prepared via RAFT (reversible addition-fragmentation chain transfer) polymerization, and the AMP is covalently located in shell or core of self-assembled copolymer micelles for efficient Cs+ adsorption. The influence of the initial concentration of Cs+, the pH value and the dosage of adsorbents, and the adsorption performance of Cs+ is evaluated. The initial concentration of Cs+ has little effect on the adsorption effect, and the optimal pH of the solution is 7.0. The adsorption–desorption cycles indicate that the micelles have excellent stability and capability for regeneration. The adsorption process of Cs+ follows the quasi-second-order kinetic model, and the adsorption equilibrium is reached within 3 h. And the equilibrium adsorption capacities are 8.49 mg/g (AMP in shell of micelle) and 9.34 mg/g (AMP in core of micelle), respectively. According to the Langmuir adsorption model, the maximum adsorption capacity of Cs+ on micelles is 71.79 mg/g and 164.20 mg/g, respectively, and the adsorption process is single-layer adsorption. The principle of Cs+ selective adsorption is the Cs+ and NH4+ exchange reaction in the gaps of the AMP. The results show that micelle with AMP loaded in shell is considered to be the more suitable adsorbent for separating and extracting Cs+.

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Funding

This work is supported by the National Natural Science Foundation of China, grant number 21804078, Natural Science Foundation of Qinghai Province, grant number 2020-ZJ-764, and Young and Middle-aged Scientific Research Foundation of Qinghai University, grant number 2017-QGY-3.

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Authors and Affiliations

  1. Qinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University, Xining, 810016, China

    Guihua Ma, Yuting Zhou, Li Gao, Bingxin Liu & Xingchang Yu

  2. Institute of Science and Technology Information Co., Ltd of Qinghai Province, Xining, 810008, China

    Youxiong Zheng

  3. Department of Mechanical Engineering, University of Alaska Fairbanks, PO Box 755905, Fairbanks, AK, 99775-5905, USA

    Lei Zhang

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  1. Guihua Ma
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  2. Youxiong Zheng
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  3. Yuting Zhou
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  4. Li Gao
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  5. Bingxin Liu
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  6. Xingchang Yu
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  7. Lei Zhang
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Correspondence to Li Gao, Bingxin Liu or Xingchang Yu.

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Ma, G., Zheng, Y., Zhou, Y. et al. Ammonium molybdophosphate functionalized copolymer micelles for efficient Cs+ adsorption. J Polym Res 28, 465 (2021). https://doi.org/10.1007/s10965-021-02817-2

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