AuCu/ZnAl-LDO复合光催化剂的制备及其光催化性能  

Preparation and Photocatalytic Activity of AuCu/ZnAl-LDO Composite Photocatalysts

作　　者：张冠华 陈语芙 孟跃[2] 张连阳 薛继龙[1] 夏盛杰[1] 倪哲明[1] ZHANG Guan-Hua;CHEN Yu-Fu;MENG Yue;Zhang liang-yang;XUE Ji-Long;XIA Sheng-Jie;NI Zhe-Ming(College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;School of Life Sciences,Huzhou University.Huzhou,Zhejiang 313000,China;Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province,Shaoxing University,Shaoxing,Zhejiang 312000,China)

机构地区：[1]浙江工业大学化学工程学院,杭州310014 [2]湖州师范学院生命科学学院,湖州313000 [3]绍兴文理学院,纺织与服装学院,浙江省清洁染整技术研究重点实验室,绍兴312000

出　　处：《无机化学学报》2020年第5期875-884,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21503188)资助;浙江省清洁染整技术研究重点实验室开放基金资助(No.QJRZ1901)资助。

摘　　要：采用浸渍还原法成功将金铜纳米颗粒负载到锌铝水滑石表面(AuCu/ZnAl-LDHs),焙烧制得复合金属氧化物(AuCu/ZnAlLDO)。通过X射线粉末衍射(XRD)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis DRS)技术对材料的晶型、形貌、元素组成以及光吸收性能进行分析。以邻苯二酚为降解物,研究AuCu/ZnAl-LDO在可见光下的光催化性能。实验结果显示:相比于纯锌铝复合金属氧化物(ZnAl-LDO),AuCu/ZnAl-LDO具有更强的可见光吸收能力。Au、Cu负载比例为5∶1,焙烧温度为400℃的催化剂在5 h内对邻苯二酚的降解率为94.5%,其降解的反应速率常数为ZnAl-LDO的13.4倍。此外,借助理论计算推测了AuCu/ZnAl-LDO电子转移的路径,并以此提出可能的光催化降解机理。Gold and copper nanoparticles were supported on the surface of zinc-aluminum layered double hydroxides(AuCu/ZnAl-LDHs)by method of impregnation-reduction.Mixed metal oxides(AuCu/ZnAl-LDO)were obtained from AuCu/ZnAl-LDHs after calcination.The as-prepared photocatalysts were well characterized by powder X-ray diffraction(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS)and UVVis diffuse reflectance spectroscopy(UV-Vis DRS)to investigate the crystal structures,microstructure,elemental composition and visible light absorption capability.The photocatalytic performance of AuCu/ZnAl-LDO was studied by degradation of catechol under visible Light.The results of experimental indicated that AuCu/ZnAl-LDO had stronger visible light absorption capacity than pure zinc-aluminum mixed metal oxides(ZnAl-LDO).The degradation efficiency of catechol reached 94.5%after 5 h irradiation,when loading ratio of AuCu was 5∶1 and calcination temperature was 400℃.The photodegradation reaction rate constant was 13.4 times that of ZnAlLDO.In addition,The path of AuCu/ZnAl-LDO electron transfer was deduced and a possible photocatalytic degradation mechanism was proposed by density functional theory calculation.

关 键 词：AuCu/ZnAl-LDO 光催化 电子传递 密度泛函理论 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]