四元季铵盐改性纤维素微球吸附剂对 Tc 的超高选择性去污。
Quaternary phosphonium modified cellulose microsphere adsorbent for Tc decontamination with ultra-high selectivity.
机构信息
Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
出版信息
J Hazard Mater. 2021 Jan 5;401:123354. doi: 10.1016/j.jhazmat.2020.123354. Epub 2020 Jun 30.
Decontamination of radioactive TcO from nuclear wastes is increasingly crucial for spent nuclear fuel reprocessing and environmental remediation. In the presence of a large excess of competitive anions, the selective separation of TcO is a major challenge for adsorbents. Herein, by using pre-radiation induced grafting polymerization, we have modified economical and environmentally friendly cellulose microspheres to obtain quaternary phosphonium decorated TcO adsorbents with an ultra-high selectivity, designated CMS-g-VBPPhNO. The prepared materials show adsorption capacities of 251 mg g (for the surrogate Re). The selective factor against NO in 0.5 mol kg HNO is as high as 168, showing excellent anion-exchange selectivity towards TcO. Moreover, CMS-g-VBPPhNO was packed in column for treating simulated acidic waste solutions containing Cs, Sr, Eu, Zr, Ru, U and Re, and it showed excellent Re separation performance. Tracer amount of Tc experiments showed that comparing to ReO, CMS-g-VBPPhNO has a better adsorption selectivity for TcO.
从核废料中去除放射性 TcO 对于乏核燃料再处理和环境修复变得越来越重要。在大量竞争阴离子存在的情况下，TcO 的选择性分离对吸附剂来说是一个主要挑战。在此，我们通过使用预辐射诱导接枝聚合，对经济环保的纤维素微球进行改性，得到具有超高选择性的季膦化 TcO 吸附剂，命名为 CMS-g-VBPPhNO。所制备的材料对模拟 Re 的吸附容量为 251mg g。在 0.5molkg HNO 中对 NO 的选择因子高达 168，表现出对 TcO 的优异的阴离子交换选择性。此外，CMS-g-VBPPhNO 被填充在柱中用于处理含有 Cs、Sr、Eu、Zr、Ru、U 和 Re 的模拟酸性废溶液，表现出优异的 Re 分离性能。示踪量 Tc 实验表明，与 ReO 相比，CMS-g-VBPPhNO 对 TcO 具有更好的吸附选择性。
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