ZnTiO_3-TiO_2纳米复合材料的光催化性能  

Photocatalytic Property of ZnTiO_3-TiO_2 Nano-composite Materials

作　　者：苏碧桃[1] 朱平武[1] 许晶晶[1] 赵丽[1] 

机构地区：[1]西北师范大学化学化工学院省部共建生态环境相关高分子材料重点实验室甘肃省高分子材料重点实验室,兰州730070

出　　处：《应用化学》2011年第1期33-38,共6页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20963008);甘肃省自然科学基金(0710RJZA119);甘肃省教育厅研究生导师基金(0901-02)资助项目

摘　　要：通过溶胶-凝胶(Sol-Gel)法制备了ZnTiO3-TiO2纳米复合光催化剂,利用透射电子显微镜、X射线衍射、紫外-可见吸收光谱和ζ电位等测试技术对其形貌、晶体结构及其光谱响应特性进行了表征。以亚甲基蓝(MB)溶液的脱色降解为模型反应,考察了光源和焙烧温度对该纳米复合材料光催化性能的影响。结果表明,所得纳米复合材料的催化性能与材料的尺寸、在介质中的分散性能、表面荷电性质等有关。600℃下焙烧3h所得的ZnTiO3-TiO2纳米复合材料尺寸小(约60nm)、分散性能好、表面荷负电荷量最高、催化性能最好,且在太阳光下的活性高于紫外光下的。如太阳光下7h可使亚甲基蓝(MB)溶液的脱色降解率达到93%,而在紫外光下只有82%;并且其催化活性高于纯TiO2和ZnO的。该纳米复合催化剂重复使用4次仍能使亚甲基蓝(MB)溶液的脱色降解率在80%以上。因此,具有较好的光催化稳定性能。ZnTiO3-TiO2 nano-composite photocatalytic materials were prepared via a Sol-Gel method and characterized by transmission electron microscope（TEM）,X-ray diffractometry（XRD）,UV-Vis spectrum and zeta（ζ） potential.The influences of light source and calcination temperature on the photocatalytic property of the nano-composite materials was investigated by decolorizing degradation of methylene blue（MB） solution as a probe.The results exhibit that the catalytic activity of the as-prepared material depends on the particle size,dispersibility in solution as well as the superficial charge.On the surface of the ZnTiO3-TiO2 obtained by calcinin at 600 ℃ for 3 h,which can disperse well in solution and has an average particle size of 60 nm and highest negative charge,decolorizing efficiency of MB solution was up to 93% under sunlight radiation for 7 h while the efficiency was just 82% under ultraviolet light radiation for same time radiation.Such efficiency can be maintained higher than 80% when the catalyst is repeatedly used for 4 times.The nano-composite material shows higher photocatalytic activity than pure TiO2 and ZnO,and has preferable photocatalytic stabilization property under sunlight.

关 键 词：ZnTiO3-TiO2纳米复合材料 溶胶凝胶法 光催化性能 

分 类 号：O643[理学—物理化学]