掺入金属离子的TiO_2纳米粒子光催化降解吖啶橙  

Photocatalytic oxidative degradation of acridine orange by TiO_2 nanoparticles doped with metal ion.

作　　者：陈慧[1] 金星龙 朱琨[2] 苏碧桃[1] 房彦军[1] 杨瑞强 

机构地区：[1]西北师范大学化学系,甘肃兰州730070 [2]兰州铁道学院环境工程系,甘肃兰州730070

出　　处：《中国环境科学》2000年第6期561-564,共4页China Environmental Science

基　　金：国家自然科学基金!(29977015);甘肃省自然科学基金!(ZS981-A24-058-Y)

摘　　要：利用酸催化溶胶－凝胶法（ｓｏｌ－ｇｅｌ）制备了 Ｆｅ３＋和 Ｃｒ３＋不同掺入量的 ＴｉＯ２半导体纳米粒子研究了这些纳米粒子对吖啶橙光催化氧化降解的影响．结果表明，微量 Ｆｅ３＋和 Ｃｒ３＋的掺入可明显提高 ＴｉＯ２的光催化活性．进一步研究表明，在 Ｆｅ３＋－ＴｉＯ２体系中，最佳掺入量为 ０．１％，而且中性介质和自然光有利于光催化氧化反应的进行，反应３ｈ后降解率可达９７．７５％．在Ｃｒ３＋－ＴｉＯ２体系中，弱碱性介质和自然光有利于光催化氧化反应，最佳掺入量为０．０５％，降解率可达８７．５４％．Fe3+ and Cr3+)-doped TiO2 nanoparticles with different doping amount were prepared through the acidcatalyzed sol-gel method. The influence of these nanoparticles on the photocatalytic oxidative degradation of acridine orange (AO) was investigated. The results indicated the micro-amount of (Fe3+ or Ce3+)-doping could markedly improve the photocatalytic activity of TiO2. Moreover, in the Fe3+-TiO2 system, 0. 1 % was the optimal amount of doping; neutral condition and natural sunlight (NSL) were favorable for photocatalytic oxidation. After three hours reaction, the degradation rate of AO could reach 97.75%. In the Cr3+- TiO2 system, 0.05% was optimal amount of doping; alkalescent condition and NSL were favorable for photocatalytic oxidation, the degradation rate of AO could reach 87.54%.

关 键 词：光催化氧化 吖啶橙 污染物降解 二氧化钛 

分 类 号：X592.05[环境科学与工程—环境工程]