摘要
随着能源和环境问题的日益严峻。光催化技术得到了人们的广泛关注。制约光催化技术发展应用的一个主要障碍是催化剂中光生载流子的快速复合。催化剂的修饰改性是抑制载流子的快速复合重要方法之一，对此已进行了许多研究．并取得了一定的成效。另一个重要方法是将具有不同能带结构和不同类型的半导体进行复合，形成具有特殊结构的光催化材料。
SrZrO3 particles were prepared were then synthesized by Sr（Zr1-xYx）O3-δ an by a co-precipitation method and Sr（Zr1-xYx）O3-δ-TiO2 composite particles d titanium dioxide. The composite particles were characterized by XRD, SEM, FTIR and TG-DTA techniques. The photocatalytic degradation of methylene blue （MB） in aqueous solution was used as a probe reaction to evaluate the photocatalytic activity of the composite particles. The effect of the preparation method for SrZrO3, doping content of yttrium and TiO2 amount in the composite particles on the photocatalytic activity of composite particles was also discussed. The results show that the methylene blue solution could be completely degraded by Sr（Zr1-xYx）O3-δ-TiO2 composite particles under UV-light or visible light irradiation. The recombination of photocatalytic activity of composite particles was higher than that of pure TiO2. The fast photogenerated electrons and holes were restrained by the heterojunction formed in composite particles. The particle of SrZrO3 prepared by co-precipitation was small, and the photocatalytic activity of composite particles prepared from this kind of SrZrO3 was higher than that of particles prepared by solid method. The best doping content of yttrium is 5%. The optimal content of TiO2 in composite particles is sintering 90wt%, 70wt%, respectively under UV-light and visible light irradiation, the degradation rates of MB are 98.8% and 93.5%, respectively after 50 min irradiation.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2007年第2期347-352,共6页
Chinese Journal of Inorganic Chemistry
基金
湖南省自然科学基金资助项目(No.05JJ30018)
湖南省教育厅重点资助项目(No.05A055)
