Spent rather than pristine LiFePO4 cathode materials can catalytically activate sulfite for organic pollutants decontamination

文献类型： 外文期刊

第一作者： Wang, Pu

作者： Wang, Pu;Sun, Xiaohu;Chen, Qianqian;Liu, Yujing;Guo, Yaoguang;Zhang, Xiaojiao;Guan, Jie;Wang, Ruixue;Lou, Xiaoyi;Guo, Yaoguang;Zhang, Rui-Qin;Wang, Zhaohui;Wang, Zhaohui;Gu, Weixing

作者机构：

关键词： Spent power battery; Catalysis; Sulfite; Hydroxyl radical; Quantum chemical calculations

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：16.744； 五年影响因子：14.61 ）

ISSN： 1385-8947

年卷期： 2022 年 446 卷

页码：

收录情况： SCI

摘要： Lab-prepared Fe-bearing materials have demonstrated their ability to activate sulfite (S(IV)) to generate reactive radicals, which is however limited by their costs and inefficiencies for practical application. Here we report that spent LiFePO4 (SLFP) cathode materials can function as a robust catalyst for S(IV) activation and consequent decontamination of organic pollutants like 4,4'-sulfonyldiphenol (BPS). Unexpectedly, SLFP materials with lithium defects and oxygen vacancies (Ov) are significantly effective than pristine LiFePO4. BPS degradation undergoes an induction period when rapid adsorption of O-2 and HSO3- in water occurs, followed by a slow release of HSO5-, as evidenced by the same depletion trends of BPS and sulfite, and confirmed by theoretical calculations. The HSO5- is activated by Fe(II) on the SLFP surface, with (OH)-O-center dot being the main reactive species via a multi-step reaction. The potential environmental application of this SLFP/S(IV) process are evaluated ultimately.

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