离子交换法制备AgBr/Ag_2WO_4复合催化剂及其可见光催化性能  

Ion Exchange Synthesis of AgBr/Ag_2WO_4 Composite Catalyst with Visible Light Photocatalytic Performance

作　　者：曹静[1] 罗邦德[1] 徐本燕[1] 林海莉[1] 陈士夫[1] 

机构地区：[1]淮北师范大学化学与材料科学学院,安徽淮北235000

出　　处：《影像科学与光化学》2012年第2期110-117,共8页Imaging Science and Photochemistry

基　　金：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)

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>420nm)、以甲基橙(MO)为染料模型研究了Ag-Br/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.A novel AgBr/Ag2WO4 composite photocatalyst was synthesized by ion exchange of Ag2 WO4 substrate. AgBr/Ag2 WO4 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/ Ag2 WO4 displayed much better photocatalytic activity than single AgBr and Ag2 WO4, 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 Ag2 WO4 was beneficial to efficiently separate the photogenerated electrons and holes and then raised the photocatalytic activity of AgBr/Ag2WO4.

关 键 词：离子交换法 AgBr/Ag2WO4 可见光催化 

分 类 号：O643.36[理学—物理化学]