BiOBr@Bi_2MoO_6复合光催化剂制备及其对RhB和BPA降解  

Synthesis of BiOBr@Bi_2MoO_6photocatalyst with excellent visible light photocatalytic removal of RhB and BPA

作　　者：杨佳[1,2,3] 牛晓君[1,2,3] 陈伟仡 安少荣 NIU Xiao-jun;YANG Jia;CHEN Wei-yi;AN Shao-rong(School of Environment and Energy, South China University of Technology, Guangzhou 510006, China;The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters,Ministry of Education, Guangzhou 510006, China;Cuangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, China)

机构地区：[1]华南理工大学环境与能源学院,广东广州510006 [2]工业聚集区污染控制与生态修复教育部重点实验室,广东广州510006 [3]广东省大气环境与污染控制重点实验室,广东广州510006

出　　处：《中国环境科学》2017年第6期2130-2138,共9页China Environmental Science

基　　金：污染控制与资源化研究国家重点实验室开放课题(PCRRF14006)

摘　　要：采用"两步溶剂热"法制备了BiOBr@Bi_2MoO_6复合光催化剂,并用XRD、SEM、XPS、PL和UV-vis DRS等手段对制备的催化剂进行表征.以罗丹明B(RhB)和双酚A(BPA)为目标污染物研究了该催化剂的可见光光催化性能.结果表明,BiOBr@Bi_2MoO_6复合光催化活性明显高于纯Bi_2MoO_6,当BiOBr的负载量为20wt%时催化活性最高,对RhB和BPA降解率分别为97.51%和95.41%.通过对降解过程中产生的活性物种的测定,指出空穴(h+)和·O_2^-在污染物降解过程中起主要作用.对BiOBr@Bi_2MoO_6复合催化剂的光催化原理进行了讨论,提出BiOBr和Bi_2MoO_6之间形成的异质结构可能是促进光催化活性提高的主要原因.另外,BiOBr@Bi_2MoO_6-20异质结具有良好的稳定性,可以进行回收和重复利用.BiOBr@Bi2MoO6photocatalyst was synthesized by a two-step solvothermal method,and characterized byXRD,SEM,XPS,PL and UV-vis DRS.The photocatalytic performance was evaluated by the degradation of RhodamineB and bisphenol A(BPA)under visible light irradiation.As a result,the BiOBr@Bi2MoO6heterojunction exhibited higherphotocatalytic activity than that of pure Bi2MoO6.The optimal composite with20%BiOBr content showed the highestphotocatalytic activity,the photodegradation rate was97.51%and95.41%over RhB and BPA,respectively.By thedetection of active species,demonstrated that h+and?O2-played the crucial roles in photodegradation of pollutants.Thepossible mechanism of the enhanced photocatalytic performance of the BiOBr@Bi2MoO6heterojunctions was discussed.The result indicated that the formation of heterostructure between BiOBr and Bi2MoO6was the main effect factor withenhanced photocatalytic activity.Besides,BiOBr@Bi2MoO6-20heterostructure showed excellent stability and reusabilityin the visible light photochemical applications.

关 键 词：BiOBr@Bi2MoO6 异质结 光催化 可见光 

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