摘要：研究了晶粒粒径相近的金红石相、锐钛矿相和混晶纳米二氧化钛对苯胺、甲萘胺和邻氯苯胺3种物质的光催化降解。结果表明,晶粒粒径相近的金红石相和锐钛矿相二氧化钛纳米粒子对胺类化合物的光催化效果相近,特别是在反应的开始阶段,两者的差异很小;随着反应时间的增加,金红石相纳米二氧化钛的催化能力稍优于锐钛矿相纳米二氧化钛。成分不同的混晶的催化能力相差较大,随着混晶中的金红石相含量增加,催化剂的催化效果有了显著的提高。实验中还发现,不同的催化剂对苯胺、甲萘胺和邻氯苯胺3种物质同时催化过程中,3种有机物降解程度的顺序均为甲萘胺>邻氯苯胺>苯胺。

关键词：二氧化钛；纳米颗粒；光催化

Abstract：For the degradation reaction of aniline compounds,it was found that the photocatalytic activity of both rutile and anatase phase TiO₂ nano-particles with nearly same particle diameter were very closing,espe-cially for the start moment of photocatalytic reactions.There was a notable distinction between photocatalytic activity of different kinds of mixed-phase TiO₂ nano-particles with nearly same particle diameter.The photocatalytic activity of mixed-phase TiO₂ nano-particles could be improved by increas-ing the content of rutile phase.It was found that the degraded sequence of aniline、α -naphthyamine and o -chloramline at the simultaneity photo-catalytic reaction is α-naphthyamine > o-chloramline > aniline.

Keywords：titanium dioxide;nano-particles;photocatalysis