聚丙烯腈改性二氧化钛光催化过程的机理探究

Research on Photocatalytic Process Mechanism of Polyacrylonitrile Modified Titanium Dioxide

通过在光催化过程中加入空穴捕捉剂乙二胺四乙酸二钠(EDTA),自由基捕捉剂叔丁醇(t-Bu OH)探讨了二氧化钛光催化降解的机理。实验结果表明,空穴是光催化降解过程中重要的活性物质,对光催化活性起主要作用。由于复合微粒中的聚丙烯腈(PAN)能够有效地将光生电子-空穴分离,并降低了电子-空穴复合的机会,所以复合微粒的光催化活性较之纯Ti O_2有了明显的提高。

The mechanism of photocatalytic degradation of TiO2 was explored by adding hole inhibitors（ EDTA）,free radical inhibitors（ t-Bu OH） in the process of degradation of methyl orange. From our experiment can be found that the main oxidative species is holes in the photocatalytic process could be detected through the trapping experiments of radicals and holes. Because conductive polymer PAN will be able to separate electron-hole timely, reducing the chance of electron-hole recombination, the photocatalytic activity of the composite particle is significantly higher than that of pure TiO2.