过渡金属离子掺杂纳米TiO_2的相变与光催化活性  

Transformation and photocatalytic activities of nano-sized TiO_2 doped by transition metal ions

作　　者：郑广涛[1] 施建伟[1] 陈铭夏[1] 袁坚[1] 上官文峰[1] 

机构地区：[1]上海交通大学机械与动力学院燃烧与环境技术研究中心,上海200030

出　　处：《化工学报》2006年第3期564-570,共7页CIESC Journal

基　　金：上海市科技发展基金项目(0452nm017)~~

摘　　要：采用溶胶-凝胶法制备了掺杂Mo6+、Cr3+、Fe3+的改性纳米TiO2光催化剂,并分别在550℃和580℃下对其进行了热处理,考察了热处理温度对掺杂纳米TiO2相变和光催化活性的影响.通过光催化降解染料罗丹明B实验,对在不同热处理温度下Mo6+、Cr3+、Fe3+改性以及不同Mo6+掺杂量的TiO2光催化活性进行了评价,发现掺杂离子对TiO2光催化活性的影响与其对TiO2相转变的作用是一致的,即抑制相转变的同时也提高了光催化活性.实验结果也进一步表明,Mo6+掺杂量为0.05%(摩尔分数)时的TiO2具有最佳光催化活性.The TiO2 nanoparticles doped by Mo^6＋ , Cr^3＋ and Fe^3＋ ions with the ion concentration of 0.05% （mol） were prepared by the Sol-Gel method at calcination temperatures of 550℃ and 580℃, and characterized by XRD, BET and FT-IR. The results showed that Mo^6＋ ion doping efficiently inhibited the phase transformation of TiO2 at different temperatures, while Cr^3＋ and Fe^3＋ ion doping played a reverse effect at 550℃ and 580℃ respectively, which might be caused by the disparate status of doping ion in the titania crystals due to different calcination temperatures. The photocatalytic decomposition of dye rhodamine B was utilized to evaluate the influences of calcination temperature and ion concentration on the photoeatalytie activities of doped nano-sized TiO2. it was found that the influences of ion doping on the photocatalytic activities of titania were consistent with the influences of ion doping on phase transformation. The TiO2 doped by Mo^6＋ with the ion concentration of 0.05% （tool） showed the highest photocatalytie activities.

关 键 词：TIO2 掺杂 相转变 光催化降解 

分 类 号：TQ031.2[化学工程]