大孔TiO2负载型光催化剂的合成及其可见光催化性能  

Synthesis of Macroporous TiO2-supported Photocatalysts and Their Visible-light Catalytic Properties

作　　者：杨黄根 檀家雯 冉小春 周星玲 朱立刚 覃利琴 YANG Huang-Gen;TAN Jia-Wen;RAN Xiao-Chun;ZHOU Xing-Ling;ZHU Li-Gang;QIN Li-Qin(College of Chemistry and Food Science,YuLin Normal University,Yulin 537000,Guangxi china;Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology,Yulin Normal University,Yulin 537000,Guangxi,China)

机构地区：[1]玉林师范学院化学与食品科学学院,广西玉林537000 [2]广西农产资源化学与生物技术重点实验室,广西玉林537000

出　　处：《玉林师范学院学报》2019年第5期64-70,共7页Journal of Yulin Normal University

基　　金：国家自然科学基金(21767029,51862034);广西自然科学基金(2017GXNSFAA198197);广西中青年高校教师基础能力提升项目(2017KY0536);玉林师范学院校级科研项目(2017YJKY24)。

摘　　要：以大孔TiO2(m-TiO2)为载体,采用饱和浸渍法和(或)聚乙烯醇(PVA)保护的还原法制备0.5Fe2O3/m-TiO2、0.5AuPt2/m-TiO2、0.5AuPt2/0.5Fe2O3/m-TiO2(Fe2O3、AuPt2理论质量百分含量分别为0.5 wt%)光催化剂,利用X射线粉末衍射(XRD)、扫描电镜(SEM)、紫外-可见漫反射光谱(UV-Vis DRS)等分析技术对所制得样品的物化性质进行表征,并对其在可见光照射下降解甲基橙(MO)的光催化活性进行评价。结果表明,m-TiO2及其负载型光催化剂均具有纯的锐钛矿晶相,具有微米级大孔孔道结构,m-TiO2在可见光区的光吸收性能最弱,负载后可见光吸收性能增强,所有样品带隙能为2.73-2.94 eV,其中0.5AuPt2/0.5Fe2O3/m-TiO2具有最强的可见光吸收性能,带隙能为2.82 eV,显示良好的可见光驱动降解MO的光催化活性。With macroporous TiO2(m-TiO2)as the support,the 0.5Fe2O3/m-TiO2,0.5AuPt2/m-TiO2,and 0.5AuPt2/0.5Fe2O3/m-TiO2(the theoretical Fe2O3 or AuPt2 weight percentage was 0.5 wt%,respectively)photocatalysts were prepared using the incipient wetness impregnation or polyvinyl alcohol(PVA)-protected reduction methods.Physicochemical properties of the m-TiO2 and m-TiO2-supported samples were characterized by means of xray powder diffraction(XRD),scanning electron microscopy(SEM),and ultraviolet visible diffuse reflection spectroscopy(UV-Vis DRS)analysis technology,and their photocatalytic activities were evaluated for the removal of methyl orange(MO)under visible-light illumination.It is found that both m-TiO2 and TiO2-supported samples had pure anatase crystal phases and micro-scale macroporous sturcture.The optical absorption performance of m-TiO2 in the visible-light region was the weakest,while the visible-light absorption performance of m-TiO2-supported samples was enhanced.The band gap of all the samples could be 2.73-2.94 eV,in which the band gap of 0.5AuPt2/0.5Fe2O3/m-TiO2 was 2.82 eV,which had strong light absorption performance in the visible region and showed excellent visible-light-driven photocatalytic activity for the MO degradation.

关 键 词：负载型光催化剂 漫反射光谱 物化性质 可见光区 可见光吸收 可见光照射 光吸收性能 质量百分含量 

分 类 号：O643[理学—物理化学]