标题: Catalytic ozonation with disilicate-modified nZVI for quinoline removal in aqueous solution: Efficiency and heterogeneous reaction mechanism
作者: Wang, ZC (Wang, Zhicheng); Xian, WX (Xian, Weixin); Ma, YS (Ma, Yongsong); Xu, T (Xu, Tao); Jiang, R (Jiang, Rui); Zhu, H (Zhu, Hua); Mao, XH (Mao, Xuhui)
来源出版物: SEPARATION AND PURIFICATION TECHNOLOGY 卷: 281 文献号: 119961 DOI: 10.1016/j.seppur.2021.119961 出版年: JAN 15 2022
摘要: Nanoscale zero-valent iron (nZVI) was not considered as an ideal candidate for catalytic ozonation process in aqueous media because of its drawbacks of rapid passivation, self-agglomeration and consequent loss of reactivity. In this study, a novel disilicate-modified nZVI (Si-nZVI) material, was prepared through a liquid-phase reducing method with hydrosoluble disilicate as a modifier. The optimal Si-nZVI catalyst (Si15-nZVI), with negligible iron leaching and a good tolerance in ozone water, showed favorable water-dispersibility to achieve a highly efficient ozonation catalysis for removing quinoline (91.9% removal efficiency). Compared to the nZVI, the Si-nZVI displayed satisfactory catalytic stability and benign reusability as well. It was revealed that -[Si-O-Fe]-OH groups on Si15-nZVI, as the dominating active centers, played an essential role to boost the adsorption and catalytic decomposition of O-3 in aqueous solution. This study demonstrates the suitability of SinZVI to catalytic ozonation process, and provides a prospective oxidation technology for decontamination.
作者关键词: Nanoscale zero-valent iron; Silicate; Catalytic ozonation; Modification; Heterogeneous reaction mechanism
地址: [Wang, Zhicheng; Xian, Weixin; Ma, Yongsong; Xu, Tao; Jiang, Rui; Zhu, Hua; Mao, Xuhui] Wuhan Univ, Sch Resources & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430079, Peoples R China.
[Wang, Zhicheng; Mao, Xuhui] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.
通讯作者地址: Mao, XH (通讯作者)，Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.
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