氧化锌量子点敏化氧化铈的制备及可见光催化降解罗丹明B  

ZnO QDs sensitized CeO_(2)for enhanced photodegradation of RhB under visible-light

作　　者：宗一超 张富青 郭丽瑞 袁军 ZONG Yichao;ZHANG Fuqing;GUO Lirui;YUAN Jun(School of Chemical and Environmental Engineering,Wuhan Institute of Technology,Wuhan 430073,Hubei,China)

机构地区：[1]武汉工程大学化学与环境工程学院,湖北武汉430073

出　　处：《精细化工》2024年第11期2380-2388,2396,共10页Fine Chemicals

基　　金：绿色化工过程教育部重点实验室基金项目(武汉工程大学GCP2022003、GCX2022004);武汉工程大学研究生创新基金项目(CX2022443)。

摘　　要：采用溶胶-凝胶法合成了氧化锌量子点(ZnO QDs),将其浸渍负载在CeO_(2)微球上,制备了ZnO QDs修饰的CeO_(2)可见光催化剂ZnO QDs/CeO_(2)。通过XRD、TEM、SEM表征了ZnO QDs/CeO_(2)的结构和形貌,考察了ZnO QDs/CeO_(2)降解罗丹明B(RhB)的可见光催化性能,通过电化学阻抗(EIS)、UV-Vis测试了ZnO QDs/CeO_(2)的光电性能。结果表明,直径5~8 nm的ZnO QDs均匀分布在直径800 nm的CeO_(2)微球表面上,ZnO QDs/CeO_(2)的光响应范围拓展到550 nm。0.10 g CeO_(2)负载0.02 g的ZnO QDs制备的0.02 ZnO QDs/CeO_(2)具有最优的光催化降解RhB的性能,0.02 ZnO QDs/CeO_(2)(50 mg)在可见光照射下,催化降解50 mL初始浓度为0.1 mmol/L RhB水溶液,120 min时RhB的降解率为94.1%,而相同条件下,CeO_(2)和ZnO QDs的RhB降解率为21%和58%。空穴(h^(+))是ZnO QDs/CeO_(2)光催化降解RhB的最主要活性物种。Visible light catalyst ZnO QDs/CeO_(2)was prepared via impregnation of zinc oxide quantum dots(ZnO QDs),synthesized by sol-gel method,onto CeO_(2)microspheres,and characterized by XRD,TEM and SEM for structure and morphology analyses.The ZnO QDs/CeO_(2)obtained was then evaluated for its visible light catalytic performance on degradation of Rhodamine B(RhB),and analyzed via electrochemical impedance(EIS)and UV-Vis for its photoelectric performance.The results showed that ZnO QDs with a diameter of 5~8 nm was uniformly dispersed on CeO_(2)microspheres with a diameter of 800 nm,and its optical response range was extended to 550 nm.0.02 ZnO QDs/CeO_(2)prepared by 0.10 g CeO_(2)supported by 0.02 g ZnO QDs exhibited the best photocatalytic performance on RhB degradation.Under the reaction conditions of 0.02 ZnO QDs/CeO_(2)50 mg,initial concentration 0.1 mmol/L RhB aqueous solution 50 mL,reaction time 120 min under visible light irradiation,ZnO QDs/CeO_(2)showed a RhB degradation rate of 94.1%,while CeO_(2)and ZnO QDs displayed 21%and 58%respectively under the same conditions.Hole(h^(+))

关 键 词：光催化 氧化铈 氧化锌量子点 可见光降解 染料废水 功能材料 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]