Cu(Ⅱ)助剂与石墨烯协同增强AgBr可见光光催化性能  

Cooperation Effect of Cu(Ⅱ) Cocatalyst and Graphene for Enhanced AgBr Visible-light Photocatalytic Performance

作　　者：王明芳[1] 王苹[1] 徐顺秋 李小争[1] 

机构地区：[1]武汉理工大学化学化工与生命科学学院化学系,武汉430070

出　　处：《无机化学学报》2015年第10期1981-1986,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家级大学生创新创业训练计划项目(No.20141049714006);国家自然科学基金(No.21477094)资助项目

摘　　要：采用简单、低温的溶液浸渍法制备了Cu(Ⅱ)助剂和石墨烯共修饰的高效Ag Br可见光光催化剂。降解甲基橙的实验结果表明:经Cu(Ⅱ)助剂与石墨烯协同修饰后的Ag Br表现出很好的降解性能,其中Cu(Ⅱ)(0.5 mol·L-1)/Ag Br-r GO(0.5wt%)具有最高性能(r GO代表还原石墨烯),速率常数是0.027 31 min-1,是Ag Br(0.008 07 min-1)的3.38倍、Ag Br-r GO(0.5%)(0.015 98 min-1)的1.7倍、Cu(Ⅱ)(0.5 mol·L-1))/Ag Br(0.015 19 min-1)的1.8倍。Cu(Ⅱ)助剂与石墨烯复合协同作用增强光催化性能的原因是:Cu(Ⅱ)易于捕获光生电子,石墨烯比表面积大,可为Cu(Ⅱ)提供更多的还原位点,加快了Ag Br上的光生电子-空穴对的有效分离。本研究可以为制备高性能Ag Br光催化剂提供新的思路。In this study, a simple low-temperature solution-impregnation method was developed for the fabricationof highly efficient AgBr photocatalyst with cooperation effect of Cu（Ⅱ） cocatalyst and graphene. Photocatalyticexperimental results for the depolarization of methyl orange （MO） aqueous solution indicated that the AgBr withcooperation effect of Cu（Ⅱ） eocatalyst and graphene displayed very good photocatalytic activity. Especially, Cu（Ⅱ）（0.5 mol.L-1）/AgBr-rGO（0.5wt%） （rGO, reduced graphene oxide） showed the highest photocatalytic activity with arate constant 0.027 31 rain-1, while this value is higher than that of the pure AgBr （0.008 07 min-1）, AgBr-rGO （0.5%）（0.015 98 min-1） and Cu（ll） （0.5 mol-L-1）/AgBr （0.015 19 min-1） by a factor of 3.38, 1.7 and 1.8, respectively. Thereason for enhanced photoeatalytic performance is that Cu（ll） can quickly catch the photogenerated electrons fromAgBr and graphene has large specific surface which may provide a lot reduction active sites for Cu（Ⅱ）, resultingin a rapid separation of photogenerated electrons and holes. This work may provide the new insights for thepreparation of high performance AgBr photoeatalyst.

关 键 词：AGBR Cu(Ⅱ)助剂 石墨烯 协同作用 可见光光催化性能 

分 类 号：O643.36[理学—物理化学]