High-efficiency V-Mediated Bi2MoO6 photocatalyst for PMS activation: Modulation of energy band structure and enhancement of surface reaction

High photocorrosion and poor reaction efficiency of Bi 2 MoO 6 greatly hampered its wide application in wastewater treatment . Herein, V doped Bi 2 MoO 6 was prepared by hydrothermal-subsequent annealing strategy for the refractory sulfapyridine abatement through visible-light-driven photocatalytic activation of peroxymonosulfate (PMS). The degradation results revealed V-doped Bi 2 MoO 6 could achieved 100% sulfapyridine removal after 20 min over Bi 2 MoO 6 /PMS/Vis system, much higher than Bi 2 MoO 6 /PMS/Vis system. Experimental and theoretical calculations indicated that the V doping not only changed the energy band structure of Bi 2 MoO 6 and promoted the separation of photogenerated charges as well as improved the adsorption energy of peroxymonosulfate (PMS), H 2 O and dissolved oxygen on the catalyst surface, but also provided additional PMS activation pathway through V 5+ /V 4+ redox cycles, finally contributed to enhanced sulfapyridine degradation performance in Bi 2 MoO 6 /PMS/Vis system. Our work provides insight into designing highly efficient photocatalyst as a promising PMS activator for environmental application.