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应用化学 ›› 2011, Vol. 28 ›› Issue (01): 33-38.DOI: 10.3724/SP.J.1095.2011.00204

• 研究论文 • 上一篇    下一篇

ZnTiO3-TiO2纳米复合材料的光催化性能

苏碧桃*,朱平武,许晶晶,赵丽   

  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）
  • 收稿日期:2010-04-09 修回日期:2010-05-31 出版日期:2011-01-10 发布日期:2011-01-10
  • 通讯作者: 苏碧桃，教授; Tel:0931-7975055; E-mail:subt0608@sina.com; 研究方向：纳米半导体材料与光催化
  • 基金资助:
    国家地区自然科学基金(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

Photocatalytic Property of ZnTiO3-TiO2 Nano-composite Materials

SU Bi-Tao*, ZHU Ping-Wu, XU Jing-Jing, ZHAO Li   

  1. (Key Laboratory of Eco-Environment-Related Polymer Materials,Ministry of Education,
    Key Laboratory of Polymer Materials of Gansu Province,College of Chemistry and
    Chemical Engineering,Northwest Normal University,Lanzhou 730070)
  • Received:2010-04-09 Revised:2010-05-31 Published:2011-01-10 Online:2011-01-10

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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3 h所得的ZnTiO3-TiO2纳米复合材料尺寸小（约60 nm）、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7 h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。

关键词: ZnTiO3-TiO2纳米复合材料, 溶胶凝胶法, 光催化性能

Abstract:

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.

Key words: ZnTiO3-TiO2 nano–composite materals, Sol-Gel method, photocatalytic property

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