CuO/BiFeO3异质结光催化还原溶液中U(Ⅵ)的性能  

Photocatalytic reduction of U(Ⅵ)in aqueous solution by CuO/BiFeO3 heterojunction under visible light irradiation

作　　者：李小燕[1] 陈超[2] 刘义保[1] 刘宸 李寻[1] 官芬芬[1] 肖慧[1] LI Xiao-yan;CHEN Chao;LIU Yi-bao;LIU Chen;LI Xun;GUAN Fen-fen;XIAO Hui(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;China Institute for Radiation Protection,Taiyuan 030006,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,南昌330013 [2]中国辐射防护研究院,太原030006

出　　处：《中国有色金属学报》2020年第6期1389-1398,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(41761090,11465002);江西省自然科学基金资助项目(20171ACB2021);核资源与环境国家重点实验室资助项目(NRE1608)。

摘　　要：通过湿浸渍法制备了CuO/BiFeO3可见光响应异质结光催化剂,通过SEM、XRD、XPS、UV-Vis等分析手段对材料进行表征,并在室温下以氙灯为光源,探讨CuO/BiFeO3异质结复合催化剂光催化还原溶液中U(Ⅵ)的性能,并对光催化还原机理进行了初步分析。结果表明,CuO颗粒呈球状,表面光滑,为单斜晶型。BiFeO3由不规则的颗粒团聚成层状,为钙钛矿结构。与纯CuO和BiFeO3相比,含10%CuO的CuO/BiFeO3对U(Ⅵ)的光催化还原效果最好,其去除效率远高于纯CuO和BiFeO3的;在可见光照射下催化反应100min时,U(Ⅵ)的去除率达96%以上。该催化剂光催化活性的提升主要是由于在CuO和BiFeO3界面上形成的p-n异质结结构有效地抑制了光生电子与空穴的复合,增强了界面电荷传输效率,使光催化效率得到了提高。光催化剂循环使用4次后,U(Ⅵ)的去除率仍在80%左右,说明其稳定性比较好。CuO/BiFeO3 heterojunction catalysts were prepared by wetness impregnation method and the structures,morphologies and optical properties of the samples were characterized by SEM,XRD,XPS and UV-Vis.The photocatalytic reduction of U(Ⅵ)in aqueous solution by CuO/BiFeO3 heterojunction catalyst was investigated under visible light irradiation at room temperature and analyzed the mechanism of photocatalytic reduction of U(Ⅵ).The results show that the CuO particles are spherical and smooth in surface,they are monoclinic.BiFeO3 particles are irregular and agglomerated into layers,which are perovskite structure.CuO/BiFeO3 containing 10%CuO exhibited the lowest photoluminescence intensity and the maximum photocatalytic reduction of U(Ⅵ)than pure CuO and BiFeO3 and the removal rate of U(Ⅵ)reached above 96%after 100 min under visible-light irradiation.The improvement of photocatalytic activity of the catalyst is mainly due to the p-n heterostructure formed on the interface of CuO and BiFeO3,which effectively inhibits the recombination of photogene rated electronics and holes,enhances the transfer efficiency of interfacial charge,and improves the photocatalytic efficiency.The removal rate of U(Ⅵ)is above 80%after four cycles,which indicates that CuO/BiFeO3 composite catalyst has an excellent photocatalytic stability.

关 键 词：氧化铜 铁酸铋 异质结 光催化 还原 铀 

分 类 号：X703.5[环境科学与工程—环境工程]