微波辅助法制备Ba2+掺杂BiOBr催化剂及其光催化性能  

Microwave-assisted Synthesis of Ba2+ Doped BiOBr Catalyst and its Photocatalytic Properties

作　　者：陈肖肖 张淑娟[2] CHEN Xiaoxiao;ZHANG Shujuan(College of Chemical Engineering and Materials Science,Tianjin University of Science&Technology,Tianjin 300457,China;College of Science,Tianjin University of Science&Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学化工与材料学院,天津300457 [2]天津科技大学理学院,天津300457

出　　处：《天津科技大学学报》2020年第1期51-56,共6页Journal of Tianjin University of Science & Technology

摘　　要：以硝酸铋、溴化钾和氯化钡为主要原料,采用微波辅助法制备了纯BiOBr和高催化活性的Ba2+掺杂BiOBr光催化剂,通过XRD、SEM、UV-vis、PL对催化剂样品进行表征.以罗丹明B(RhB)溶液为目标污染物进行光催化降解实验,测试催化剂的光催化活性.结果表明:Ba2+-BiOBr的光催化活性明显优于纯BiOBr,仅需经过55 min就可以将质量浓度为20 mg/L的RhB溶液完全降解.这主要是因为Ba2+的掺杂有效地提高了BiOBr光催化剂中光生电子–空穴的分离效率.经过3次循环降解RhB溶液,Ba2+-BiOBr的光催化活性没有明显降低,证明光催化剂具有很好的稳定性.捕获实验表明,空穴(h+)和超氧自由基(·2 O-)为光催化过程中最主要的活性物种.Pure BiOBr and Ba2+doped BiOBr photocatalysts with good photocatalytic activity were prepared via microwave-assisted method using Bi(NO3)3·5H2O,KBr and BaCl2·2H2O as raw materials,and characterized by XRD,SEM,UVvis and PL.Their photocatalytic activity was tested by the photocatalytic degradation of Rhodamine B(RhB)solution.The results showed that the Ba2+-BiOBr has much better photocatalytic activity than pure BiOBr.Ba2+-BiOBr catalyst could completely degrade 20 mg/L RhB aqueous solution after 55 min.The better photodegradation activity could be mainly attributed to the higher separation efficiency of photo-induced electrons and holes.After three times recycling photodegradation of RhB solution,there was no significant decrease in the photocatalytic activity,implying that the prepared photocatalysts are highly stable.The trapping experiments demonstrated that the photogenerated hole(h+)and superoxide radicals(·2 O-)are the main oxidative species in the degradation reactions.

关 键 词：微波辅助法 Ba2+-BiOBr 光催化活性 罗丹明B 

分 类 号：TQ426[化学工程]