Cu^(2+)掺杂提高BiOBr纳米结构的吸附性和光催化活性  

Cu^(2+)-doped BiOBr nanostructures withenhanced adsorption and photocatalytic activity

作　　者：胡月 房国丽[1] 田景 魏杰[1] 严祥辉[1] 张刚 HU Yue;FANG Guoli;TIAN Jing;WEI Jie;YAN Xianghui;ZHANG Gang(School of Material Science and Engineering,North Minzu University,Yinchuan 750021,China;School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Academic Journal Center,Ningxia University,Yinchuan 750021,China)

机构地区：[1]北方民族大学材料科学与工程学院,银川750021 [2]宁夏大学土木与水利工程学院,银川750021 [3]宁夏大学学术期刊中心,银川750021

出　　处：《功能材料》2025年第1期1156-1163,1170,共9页Journal of Functional Materials

基　　金：银川市校企联合创新发展专项(2022XQ002);北方民族大学高层次人才计划项目;国家自然科学基金(52369020);宁夏回族自治区重点研发计划项目(2022BEE03003)。

摘　　要：采用一步溶剂热合成法制备了xCu-BiOBr纳米结构,研究了掺杂浓度对xCu-BiOBr纳米结构的吸附性和光催化性能的影响。结果表明,Cu掺杂有利于获得形貌、尺寸均一的xCu-BiOBr纳米结构,而且掺杂后xCu-BiOBr纳米结构的比表面积增大,吸附性增强,尤其0.04Cu-BiOBr对Rh B的单层饱和吸附量为9.059 mg/g,是纯BiOBr吸附量的1.6倍。同时,Cu掺杂引入杂质能级,xCu-BiOBr的带隙随Cu掺杂浓度的增加逐渐红移。但是,0.02Cu-BiOBr在可见光下展现出最高的光催化活性;随Cu掺杂量的进一步增大,xCu-BiOBr的光催化活性降低。这是因为Cu掺杂主要形成置换型固溶体,并促使其周围形成氧空位缺陷;氧空位可以俘获光生电子,从而改变光生电子、空穴的迁移和复合历程。但是,过量Cu掺杂使晶格畸变程度增大,xCu-BiOBr可能会形成载流子复合中心,这不利于光生电子、空穴的迁移,因此过量掺杂可能导致xCu-BiOBr光催化活性的降低。x Cu-BiOBr nanostructures are synthesized by one-pot solvothermal method,and the effects of copper doping concentration on the adsorption and photocatalytic activity are investigated for x Cu-BiOBr nanostructures.It is indicated that copper doping is beneficial to fabricate uniform x Cu-BiOBr nanostructure in morphology and size,increase the specific surface area of x Cu-BiOBr nanostructure,and promote its adsorbability.The monolayer saturation adsorption capacity of the 0.04Cu-BiOBr nanostructure is 9.059 mg/g for Rh B,which is 1.6 times higher than that of BiOBr.Additionally,copper doping introduces an impurity energy level,and thus the adsorption band edge of x Cu-BiOBr shows a little red-shift with increasing its copper concentration.Notably,the 0.02Cu-BiOBr has higher visible-light-driven photocatalytic activity than the other obtained x Cu-BiOBr nanostructures.With further upgradation of copper concentration,the photocatalytic activity of x Cu-BiOBr maybe decreased.It is attributed to that copper doping in x Cu-BiOBr nanostructures mainly form displacement solid solution,which cause oxygen vacancies around it.These vacancies easily capture photo-generated electrons,thereby maybe alter the migration pathway and recombination of photo-generated electrons and holes.Nevertheless,excessive copper doping increases the degree of lattice distortion in x Cu-BiOBr,and may form carrier recombination centers to hinder the migration the photo-generated electrons and holes.Therefore,excessive copper doping can lead to a decrease in the photocatalytic activity of x Cu-BiOBr.

关 键 词：xCu-BiOBr 溶剂热法 CU掺杂 吸附性 光催化活性 

分 类 号：TB334[一般工业技术—材料科学与工程]