使用具有 CuMgFe 层状双氢氧化物的非均相催化过硫酸盐降解乙苯。
Heterogeneously catalyzed persulfate with a CuMgFe layered double hydroxide for the degradation of ethylbenzene.
机构信息
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
出版信息
J Hazard Mater. 2017 Sep 15;338:372-380. doi: 10.1016/j.jhazmat.2017.05.007. Epub 2017 May 8.
CuMgFe layered double hydroxide (CuMgFe-LDH) was successfully synthesized and characterized as an efficient catalyst of persulfate (PS) for the degradation of ethylbenzene. Under the conditions of 0.2gL CuMgFe-LDH and 4.0mmolL persulfate at pH 7.6, the degradation efficiency of 0.08mmolL ethylbenzene was 93.7% with TOC removal efficiency of 65.2% in 24h, and the concentration of Cu leached into the solution was as low as 0.095mgL after the reaction. The reuse of CuMgFe-LDH showed that the catalyst was highly stable after 5 recycles. Electron Spin Resonance (ESR) test and free radical quenching experiment indicated that SO and OH radicals were the dominant species accounted for the degradation of ethylbenzene in the CuMgFe-LDH/persulfate system. Catalytic mechanism of the formation of a complex of Cu(II)OSOOSO and the subsequent redox cycle of Cu(II)/Cu(III) accounted for the generation of radicals was proposed.
成功合成了 CuMgFe 层状双氢氧化物（CuMgFe-LDH），并将其作为过硫酸盐（PS）的高效催化剂用于降解乙苯。在 0.2gL CuMgFe-LDH 和 4.0mmolL 过硫酸盐、pH 值为 7.6 的条件下，24h 内 0.08mmolL 乙苯的降解效率为 93.7%，TOC 去除率为 65.2%，反应后溶液中浸出的 Cu 浓度低至 0.095mgL。CuMgFe-LDH 的重复使用表明，催化剂在 5 次循环后仍具有很高的稳定性。电子自旋共振（ESR）测试和自由基猝灭实验表明，SO 和 OH 自由基是在 CuMgFe-LDH/过硫酸盐体系中降解乙苯的主要物种。提出了 Cu(II)OSOOSO 配合物的形成和随后的 Cu(II)/Cu(III)氧化还原循环产生自由基的催化机制。
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