title: Catalytic degradation of Acid Orange 7 by manganese oxide octahedral molecular sieves with peroxymonosulfate under visible light irradiation.
abstract: In this paper, the photodegradation of Acid Orange 7 (AO7) in aqueous solutions with peroxymonosulfate (PMS) was studied with manganese oxide octahedral molecular sieves (OMS-2) as the catalyst. The activities of different systems including OMS-2 under visible light irradiation (OMS-2/Vis), OMS-2/PMS and OMS-2/PMS/Vis were evaluated. It was found that the efficiency of OMS-2/PMS was much higher than that of OMS-2/Vis and could be further enhanced by visible light irradiation. The catalyst also exhibited stable performance for multiple runs. Results from ESR and XPS analyses suggested that the highly catalytic activity of the OMS-2/PMS/Vis system possible involved the activation of PMS to sulfate radicals meditated by the redox pair of Mn(IV)/Mn(III) and Mn(III)/Mn(II), while in the OMS-2/PMS system, only the redox reaction between Mn(IV)/Mn(III) occurred. Several operational parameters, such as dye concentration, catalyst load, PMS concentration and solution pH, affected the degradation of AO7.
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Lian
authors.initials: L
authors.lastname: Duan
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Binzhe
authors.initials: B
authors.lastname: Sun
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Mingyu
authors.initials: M
authors.lastname: Wei
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Shilu
authors.initials: S
authors.lastname: Luo
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Pan
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Aihua
authors.initials: A
authors.lastname: Xu
authors.affiliation: School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430073, China. Electronic address: lixxwh@163.com.
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Li
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D008027:Light; D017895:Manganese Compounds / Q000737:chemistry* / Q000528:radiation effects; D010087:Oxides / Q000737:chemistry* / Q000528:radiation effects; D010545:Peroxides / Q000737:chemistry* / Q000528:radiation effects; D010782:Photolysis; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D017895:Manganese Compounds; D010087:Oxides; D010545:Peroxides; C038288:peroxymonosulfate; C027424:manganese oxide; C014722:2-naphthol orange
keywords: Acid Orange 7; Degradation; OMS-2; Peroxymonosulfate; Photocatalysis