摘要：

采用溶胶凝胶技术制备电气石/TiO₂复合光催化材料,研究其光催化反应体系中的溶解氧含量、水分子团结构等,并结合光催化降解甲基橙实验对光催化反应机理进行了初探。研究表明,随着电气石/TiO₂复合光催化材料质量分数的增加,反应体系中溶解氧含量的增长速度明显加快,但溶解氧含量的饱和值十分接近,均在8.15mg/L附近。同时,电气石/TiO₂复合光催化材料的质量分数为0.1%时,静置2h后的水样峰宽由93. 5Hz下降到86.2Hz。此外甲基橙的光催化降解实验表明,电气石/TiO₂复合光催化材料的光催化活性优于粒径为50nm的纳米TiO₂,将甲基橙的光催化降解率提高了41. 8%。

关键词: 溶胶-凝胶, 二氧化钛, 电气石, 光催化剂

Abstract:

Tourmaline/TiO₂ composite photocatalytic material has been prepared mainly by the sol-gel technique. The dissolved oxygen content， the structure of water molecule clusters， etc. in the photocatalytic reaction system have been investigated. The mechanism of photocatalytic reaction is studied with of photocatalytic degradation methyl orange test. The results show that the speed of dissolved oxygen content in the reaction system increases faster obviously with the increase of the mass fraction of tourmaline/TiO₂ composite photocatalysts material. But the saturation values of dissolved oxygen content are very similar， all around 8.15 mg/L. When the mass fraction of tourmaline/TiO₂ composite photocatalystic material is 0.1%， the peak value of water sample drops from 93. 5 Hz to 86.2 Hz， by setting aside for 2 h. In addition， the photocatalytic degradation methyl orange test shows that the photocatalytic activity of the tourmaline/TiO₂ composite photocatalystic material is better than that of nano TiO₂ whose grain size is 50 nm. The photocatalytic degradation ratio of methyl orange can raise 41. 8%.

Key words: sol-gel, titania, tourmaline, photocatalysts

中图分类号: 

• O643. 36