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

doi:10.7517/j.issn.1674-0475.2012.02.110

Abstract

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

CLC Number:

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

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