可见光响应型球形Zn/BiOBr的制备及其光催化性能研究  

Synthesis and the photocatalysis of visible-light-sensitive spherical Zn/BiOBr

作　　者：徐聪聪 刘成伦[1,2] 徐龙君 Xu Congcong;Liu Chenglun;Xu Longjun(College of Chemistry and Chemical Engineering, Chongqing University,Chongqing 401331;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing 400044)

机构地区：[1]重庆大学化学化工学院,重庆401331 [2]煤矿灾害动力学与控制国家重点实验室,重庆400044

出　　处：《化工新型材料》2019年第5期203-207,共5页New Chemical Materials

基　　金：重庆市自然科学进展重点项目(CSTC2015jcyjBX0015);重庆市国土局项目(CQGT-KJ-2014)

摘　　要：采用溶剂热法制备Zn^(2+)掺杂的溴氧化铋(BiOBr)(Zn/BiOBr)光催化剂,通过X射线衍射仪、扫描电子显微镜、比表面积孔径分析仪对其结构形貌进行分析表征,并考察了其对罗丹明B(RhB)的光催化活性。结果表明,Zn^(2+)掺杂量不同的Zn/BiOBr均为四方晶型,掺入Zn^(2+)后Zn/BiOBr样品的禁带宽度缩小、比表面积增大,光催化活性均明显提高,且10%Zn/BiOBr光催化活性最高;用蓝色LED光照射120min,其对RhB溶液的光降解率达到96%,比纯BiOBr的降解效率提高16%。循环使用3次后,Zn/BiOBr降解率仍达到85%,光催化过程中h+和·O_2-是主要的活性物质。Zn2+doped BiOBr(Zn/BiOBr)photocatalysts were prepared by solvothermal method,the structural and the photocatalytic performances of products were characterized by SEM,XRD,DRS,BET and the photodegradation of rhodamine B(RhB).Experimental results showed that Zn/BiOBr were tetragonal phase,Zn/BiOBr samples had lower band gaps and higher specific surface area,which contributed to the higher photocatalytic performance.What is more,10% Zn/BiOBr samples revealed the most efficient for degradating RhB and the degradation rate were 96% within 120 min under blue LED,which increased by 16%than that of pure BiOBr.After cycling for three times,the degradation rate of RhB maintained 85%.The results also suggested that h+and·O2-were the main reactive species in the photocatalytic process for Rh B degradation.

关 键 词：Zn/BiOBr 可见光催化活性 LED 光降解 

分 类 号：O643.36[理学—物理化学]