可见光响应的BiVO_4/TiO_2纳米复合光催化剂  

Visible-Light Responding BiVO_4/TiO_2 Nanocomposite Photocatalyst

作　　者：嵇天浩[1] 杨芳[1] 周娇艳[1] 杜海燕[1] 孙家跃[1] 

机构地区：[1]北京工商大学化学与环境工程学院,北京100048

出　　处：《光谱学与光谱分析》2010年第7期1944-1947,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20473007);(973计划)项目(2006CB932605)资助

摘　　要：通过水热法制备了两种新型纳米复合材料Bi VO4/Ti O2,并对其晶体结构、形貌尺寸及光催化活性进行了测试。X射线粉末衍射测试结果表明,这两种复合材料均是由单斜相Bi VO4和锐钛矿型Ti O2构成;扫描电镜和透射电镜测试结果表明,两种样品均为Bi VO4纳米颗粒负载于Ti O2纳米线上;通过测试紫外-可见吸收光谱可观察到Bi VO4/Ti O2的吸收边相对于纯Ti O2明显发生了红移;在相同实验条件下,对亚甲基蓝的可见光催化降解实验结果表明,由含Bi3+钛酸盐纳米线制备的Bi VO4/Ti O2的光催化活性远高于纯Bi VO4和Ti O2半导体材料。The two kinds of new nanocomposites BiVO4/TiO2 nanowires were synthesized by hydrothermal process. Their crystal structure, morphology and photocatalytic activities for degradation of methylene blue solution were characterized using various measurement techniques. The XRD results indicate that they are made up of monoclinic BiVO4 and anatase TiO2 phases. The SEM, TEM and HRTEM images show that the two samples include BiVO4 nanoparticles supported onto TiO2 nanowires. The UV-Vis absorption spectra reveal that the absorption edges of the samples exhibit red-shift in comparison with that of the pure TiO2 nanowires. The measurement results for the visible-light photodegradation of methylene blue show that the nanocomposite sample prepared from the layered titanate nanowires with Bi^3＋ has the highest photocatalytic activity.

关 键 词：纳米复合物 BiVO4/TiO2 光催化剂 可见光响应 水热合成 

分 类 号：O482[理学—固体物理]