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Published on: March 29, 2019
Mechanistic insights into Fe-BiOBr for enhanced catalytic activation of peroxymonosulfate
Haohao Chen1, Houle Zhou2, Chunqiu Han3
1College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang 443002, China; Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China.
Abstract:
Peroxymonosulfate (PMS)-based advanced oxidation processes have great potential for application in environmental pollution. However, improving the PMS activation performance or controling the PMS activation is still a hot research topic. Here, we report the successful synthesis of BiOBr doped with iron using a simple solvothermal method and subsequently employed in a PMS-based photo-Fenton process for the degradation of atrazine. As a result, the doped Fe significantly enhanced the activation of PMS for atrazine degradation, leading to an increase in the degradation rate from 26.37 % to 97.04 % in 30 min. Mechanistic studies elucidated by the experiments involving capture and probe of active species. It was revealed that high-valent iron (FeIV=O) was identified as the primary active species in the Fe-BiOBr/PMS/light system, while the concentration of 1O2 increased from 9.07 to 31.90 μmol/L compared to the BiOBr/PMS/light system. Moreover, the selective poisoning experiments with thiocyanate demonstrated that the performance of Fe-BiOBr depended on the Fe active sites. Benefiting from the synergistic effect of the Fe active sites and active species of FeIV=O and 1O2, the Fe-BiOBr/PMS/light system exhibited a more superior photocatalytic performance for atrazine degradation than the BiOBr/PMS/light system. This work offers new insights on designing highly efficient photocatalysts for the PMS-based photo-Fenton process.
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