电气石/TiO_2复合材料的光催化体系研究

Study on the photocatalytic system of tourmaline TiO_2 composite material

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8.15 mg/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2 h后的水样峰宽由93.5 Hz下降到86.2 Hz。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50 nm的纳米TiO2,将甲基橙的光催化降解率提高了41.8%。

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 photocatalytie reaction system have been investigated. The mechanism of photoeatalytie reaction is studied with of photoeatalytic 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 photoeatalysts 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 photoeatalytic degradation methyl orange test shows that the photocatalytic activity of the tourmaline/TiO2 composite photoeatalystic 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%.