Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 400, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123187
Keywords
Photocatalysis; Peroxymonosulfate; Bi2MoO6; Atrazine; Degradation intermediates
Categories
Funding
- National Natural Science Foundation of China, China [51878423]
- Sichuan science and technology program: key research and development program [2019YFG0314, 2017SZ0180, 2019YFG0324]
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In this study, bismuth molybdate (Bi2MoO6) nanosheets were prepared via a facile hydrothermal method and applied to activate peroxymonosulfate (PMS) for atrazine (ATZ) elimination under visible light irradiation. An effective photocatalytic synergy was observed in vis/Bi2MoO6/PMS system. The Bi2MoO6 catalyst showed an excellent stability and extremely low metal leaching in the vis/Bi2MoO6/PMS system which were characterized by XRD, XPS, HRTEM, SEM and FT-IR technologies. Besides, the influence of operation parameters (i.e., Bi2MoO6 dosage, PMS concentration, initial pH, ATZ concentration, co-existing anions, and humic acid) on the removal of ATZ were also investigated in detail. The best ATZ degradation efficiency (> 99 %) was obtained with Bi2MoO6 dosage of 0.6 g/L, PMS concentration of 0.8 mM, and ATZ concentration of 2.5 mg/L after 60 min. UV-vis DRS and Mott-Schottky analysis were taken to evaluate the band structure of Bi2MoO6. Trapping experiments and EPR detection demonstrated that superoxide radicals, hydroxyl radicals, sulfate radicals and h(+ )both contributed to ATZ degradation, of which hydroxyl radical (OH)-O-center dot) and h(+) were the major species. Besides, the performance of vis/Bi2MoO6 /PMS system for different pollutant removal was also investigated. Finally, the possible degradation products were monitored by UPLC-QTOF-MS/MS and the pathways of ATZ degradation were put forward. Overall, the vis/Bi2MoO6/PMS system shows the potential for the removal of organic pollutants in environmental remediation.
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