离子交换法制备AgBr/Ag2WO4复合催化剂及其可见光催化性能

doi:10.7517/j.issn.1674-0475.2012.02.110

影像科学与光化学 ›› 2012, Vol. 30 ›› Issue (2): 110-117.DOI: 10.7517/j.issn.1674-0475.2012.02.110

离子交换法制备AgBr/Ag₂WO₄复合催化剂及其可见光催化性能

曹静, 罗邦德, 徐本燕, 林海莉, 陈士夫

淮北师范大学化学与材料科学学院, 安徽淮北 235000

收稿日期:2011-07-29 修回日期:2011-10-14 出版日期:2012-03-15 发布日期:2012-03-15
通讯作者: 林海莉,E-mail: linhaili@mail.ipc.ac.cn.
基金资助:
国家自然科学基金(20973071); 安徽省教育厅自然科学基金(KJ2012Z356); 淮北师范大学青年基金(2011XQXM31).

Ion Exchange Synthesis of AgBr/Ag₂WO₄ Composite Catalyst with Visible Light Photocatalytic Performance

CAO Jing, LUO Bang-de, XU Ben-yan, LIN Hai-li, CHEN Shi-fu

College of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, Anhui, P.R. China

Received:2011-07-29 Revised:2011-10-14 Online:2012-03-15 Published:2012-03-15

摘要/Abstract

摘要： 以Ag₂WO₄为载体,采用离子交换法合成了新型的AgBr/Ag₂WO₄复合光催化剂.利用XRD、SEM和UV-Vis对AgBr/Ag₂WO₄催化剂进行了表征,在可见光条件下(500 W、λ>420 nm)、以甲基橙(MO)为染料模型研究了AgBr/Ag₂WO₄的光催化活性.结果表明,AgBr/Ag₂WO₄具有比单独的AgBr和Ag₂WO₄更佳的催化活性,其中30%-AgBr/Ag₂WO₄复合催化剂具有最大光催化活性.机理研究表明,在MO的降解过程中,·O₂^-起主要作用,h⁺次之而·OH可以忽略.AgBr和Ag₂WO₄之间构成的异质结有效分离了光生电子和空穴,提高了催化剂的活性.

关键词: 离子交换法, AgBr/Ag₂WO₄, 可见光催化

Abstract: A novel AgBr/Ag₂WO₄ composite photocatalyst was synthesized by ion exchange of Ag₂WO₄ substrate. AgBr/Ag₂WO₄ was characterized by XRD, SEM and UV-Vis. The photocatalytic activity of AgBr/Ag₂WO₄ was investigated with methyl orange (MO) as dye model under the visible light irradiation(500 W,λ>420 nm). The results showed that AgBr/Ag₂WO₄ displayed much better photocatalytic activity than single AgBr and Ag₂WO₄, in which 30%-AgBr/Ag₂WO₄ sample showed the best photocatalytic activity.The mechanism results suggested that ·O₂^- played the major role, followed by h⁺, while ·OH could be negligible during the MO photodegradation process. The heterojunction formed by AgBr and Ag₂WO₄ was beneficial to efficiently separate the photogenerated electrons and holes and then raised the photocatalytic activity of AgBr/Ag₂WO₄.

Key words: ion exchange method, AgBr/Ag₂WO₄, visible light photocatalysis

中图分类号:

曹静, 罗邦德, 徐本燕, 林海莉, 陈士夫. 离子交换法制备AgBr/Ag₂WO₄复合催化剂及其可见光催化性能[J]. 影像科学与光化学, 2012, 30(2): 110-117.

CAO Jing, LUO Bang-de, XU Ben-yan, LIN Hai-li, CHEN Shi-fu. Ion Exchange Synthesis of AgBr/Ag₂WO₄ Composite Catalyst with Visible Light Photocatalytic Performance[J]. Imaging Science and Photochemistry, 2012, 30(2): 110-117.

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离子交换法制备AgBr/Ag₂WO₄复合催化剂及其可见光催化性能

Ion Exchange Synthesis of AgBr/Ag₂WO₄ Composite Catalyst with Visible Light Photocatalytic Performance

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