Catalytic degradation of Acid Orange 7 by manganese oxide octahedral molecular sieves with peroxymonosulfate under visible light irradiation

被引：110
作者：
Duan, Lian [1 ]
Sun, Binzhe [1 ]
Wei, Mingyu [1 ]
Luo, Shilu [1 ]
Pan, Fei [1 ]
Xu, Aihua [1 ]
Li, Xiaoxia [2 ]
机构：
[1] Wuhan Text Univ, Sch Environm Engn, Wuhan 430073, Peoples R China
[2] Wuhan Text Univ, Sch Chem & Chem Engn, Wuhan 430073, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2015年 / 285卷
基金：
美国国家科学基金会; 湖北省教育厅重点项目;
关键词：
Photocatalysis; Degradation; Peroxymonosulfate; OMS-2; Acid Orange 7; AG3PO4; SUB-MICROCRYSTALS; PHENOL DEGRADATION; AZO-DYE; OXIDATION; OMS-2; TIO2; PERFORMANCE; DECOLORIZATION; ACTIVATION; MECHANISM;
D O I：
10.1016/j.jhazmat.2014.12.015
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：356 / 365
页数：10
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