In_(2)O_(3)/Ag:ZnIn_(2)S_(4)“TypeⅡ”型异质结构材料的制备及可见光催化性能  

Preparation of In_(2)O_(3)/Ag:ZnIn_(2)S_(4)“TypeⅡ”heterogeneous structure materials for visible light catalysis

作　　者：徐振和 李泓江 高雨 礼峥 张含烟 徐宝彤 丁茯 孙亚光 XU Zhenhe;LI Hongjiang;GAO Yu;LI Zheng;ZHANG Hanyan;XU Baotong;DING Fu;SUN Yaguang(College of Environmental and Chemical Engineering,Dalian University,Dalian 116622,Liaoning,China;Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China)

机构地区：[1]大连大学环境与化学工程学院,辽宁大连116622 [2]沈阳化工大学辽宁省无机分子基化学重点实验室,辽宁沈阳110142

出　　处：《化工学报》2022年第8期3625-3635,共11页CIESC Journal

基　　金：国家自然科学基金项目(51402198);辽宁省“兴辽英才计划”项目(XLYC2007166)。

摘　　要：采用低温油浴的方法,制备出具有“TypeⅡ”异质结构的In_(2)O_(3)/Ag:ZnIn_(2)S_(4)复合材料光催化剂。使用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)以及光电化学测试(PEC)等技术对物相、形貌结构、元素化合状态、光响应特性等方面进行探究。在可见光照射下进行光解水制氢和光降解甲基橙(MO)实验来评价光催化剂的光催化活性,结果表明,粉末状光催化剂In_(2)O_(3)/40.0%(质量分数)Ag:ZnIn_(2)S_(4)的光催化制氢速率达到21.85μmol·h^(-1),约是In_(2)O_(3)和Ag:ZnIn_(2)S_(4)的57.5倍和1.5倍。在可见光下的降解MO实验中,In_(2)O_(3)/40.0%Ag:ZnIn_(2)S_(4)光降解速率为0.3466 min^(-1),分别约是In_(2)O_(3)和Ag:ZnIn_(2)S_(4)的105倍和2.1倍。这主要归因于In_(2)O_(3)和Ag:ZnIn_(2)S_(4)之间形成的“TypeⅡ”异质结构,促使光生载流子的快速迁移和分离。The Ag:ZnIn_(2)S_(4)nanosheets were grown internal and external surface of hollow In_(2)O_(3)microtubes,with the reasonable design and construction of a visible light-responsive In_(2)O_(3)/Ag:ZnIn_(2)S_(4)tubular heterostructure photocatalysts.The samples were prepared by a low-temperature oil bath method to ensure the uniform distribution of each component.Experimental preparation process:firstly,In(NO_(3))_(3) and 1,4-benzenedicarboxylic acid were dissolved in N,N-dimethylformamide(DMF)and placed in a low-temperature oil bath to obtain the precursor In MIL-68.To synthesize the hexagonal In_(2)O_(3)microtubes,In-MIL-68 was placed in a crucible,and then kept at a constant temperature of 500℃for 2 h in a muffle furnace.Growth of Ag:ZnIn_(2)S_(4)nanosheets on both inner and outer surfaces of In_(2)O_(3)microtubes was achieved by a low temperature hydrothermal method.X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),UV-visible diffuse reflection spectroscopy(UV-Vis DRS),and photoelectric chemical analysis(PEC)were used to investigate the phase,morphology,elemental combination state and light response characteristics of photocatalysts.After rigorous comparison and analysis,the optimized In_(2)O_(3)/40.0%(mass)Ag:ZnIn_(2)S_(4)sample exhibited an excellent rate of H2 production(21.85μmol·h^(-1))under visible light irradiation,which was 57.5 times and 1.5 times higher than that of pure In_(2)O_(3)(0.38μmol·h^(-1))and Ag:ZnIn_(2)S_(4)(14.79μmol·h^(-1)).Simultaneously,in the experiment of MO degradation under visible light irradiation,the photodegradation rate of In_(2)O_(3)/40.0%Ag:ZnIn_(2)S_(4)was 0.3466 min^(-1),about 105 times and 2.1 times of In_(2)O_(3)(0.0033 min^(-1))and Ag:ZnIn_(2)S_(4)(0.1669 min^(-1)),respectively.These improvements are because of synergetic effect of compact heterojunction by unveiling a greater number of catalytically active sites and effectively enhancing charge-carrier separation and relocation.This

关 键 词：催化剂 复合材料 降解 制氢 ZnIn2S4 IN2O3 

分 类 号：TQ028.8[化学工程]