Abstract
To achieve efficient catalytic activity for emerging contaminants degradation in water environment, this work creatively prepared a silicon-based catalyst (Co/ASepx), which built a metal-silicon framework in-situ growing on sepiolite (Sep) through hydrothermal synthesis, and further obtained via high-temperature pyrolysis. Then the Co/ASepx was used to activate peroxymonosulfate (PMS) to remove metronidazole (MNZ) from water environment. The results showed that the Co/ASepx presented a substantial number of Co/MgSiO3-Co interfacial structures, the introducing of interface engineering triggered the strong metal-support interaction between Co and Sep, then altered the surface electron distribution and regulated the coordination environment of the metal Co. The Co/ASep1-PMS system not only exhibited the significant MNZ removal performance, and the MNZ degradation rate in the Co/ASep1-PMS system was 5.4 times than that of the Co2+-PMS homogeneous catalytic system with the same Co dosage, but also presented low Co leaching and high cycling stability. Moreover, the quadruple mechanism of MNZ degradation were comprehensively revealed, in which was dominated by the singlet oxygen of the non-radical pathway. Lastly, this work provides a novel feasible way to build high-performance catalysts with low Co leaching and low cost for the outstanding removal efficiency of MNZ.
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