期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 281, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.119961
关键词
Nanoscale zero-valent iron; Silicate; Catalytic ozonation; Modification; Heterogeneous reaction mechanism
资金
- National Key R&D Program of China [2020YFC1807902]
- R&D program from the Department of Science and Technology in Hebei province [19273604D]
- Innovation project from Zhongshan Municipal Science and Technology Bureau [191127192749449]
- Fellowship of China Post-doctoral Science Foundation [2020M682488]
This study demonstrates that Si-nZVI is a suitable candidate for catalytic ozonation process and offers a prospective oxidation technology for decontamination.
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.
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