用扩散火焰燃烧合成Fe^3＋掺杂TiO2纳米晶的结构及紫外光催化性能  

Structure and UV Photocatalytic Activity of Fe^(3+)-Doped TiO_2 Nanocrystals Synthesized by Diffusion Combustion Flames

作　　者：赵尹[1,2] 李春忠[1] 刘秀红[1] 施利毅[2] 

机构地区：[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237 [2]上海大学纳米科学与技术研究中心,上海200444

出　　处：《华东理工大学学报（自然科学版）》2009年第1期39-43,共5页Journal of East China University of Science and Technology

基　　金：国家自然科学基金重点项目(20236020);上海市重点实验室专项(04DZ05622,05DZ22303);上海市纳米科技专项(0452nm001,0452nm047,0552nm001);上海市科委学科带头人计划(07XD14014);上海市科委技术创新人才团队建设专项项目(06DZ05902);上海高校选拔培养优秀青年教师科研专项基金

摘　　要：采用气相火焰燃烧合成Fe3+掺杂TiO2纳米晶,利用XRD、XPSI、CP-AES和EPR等手段分析了物相结构,考察了Fe3+掺杂TiO2纳米晶在紫外光辐照下降解罗丹明B活性,探讨了紫外光催化机理。结果表明:Fe3+掺杂显著提高了TiO2纳米晶的光催化活性,Fe3+最佳掺杂摩尔分数为0.05%。Fe3+作为光生电子和空穴的双重浅势捕获陷阱,有效地分离了光生载流子,提高了光催化活性。但在TiO2体相中过多Fe3+富集将增加因多次捕获而造成的载流子复合,降低光催化活性。Fe^3＋-doped TiO2 nanoparicles were prepared by diffusion flame method. The prepared TiOz were characterized by XRD, ICP-AES, XPS and EPR. The activity of TiO2 nanocrystals on photodegradation of RhB was investigated under UV light irradiation and the mechanism was elaborated to demonstrate the improved photocatalysis activity of Fe^3＋-doped TiO2 nanocrystals. The best photocatalysis activity of 0.05 % Fe^3＋ doped TiO2 nanoparticles is attributed to the fact that Fe^3＋ on the near surface of TiO2 can be considered as both hole and electron traps and inhibit the charge pair recombination. However, high level Fe^3＋ doping in bulk TiO2 matrix would lead to charge pair recombination and undermine the photocatalytic activities of TiO2 nanoparticles.

关 键 词：火焰燃烧 TIO2 纳米晶 Fe3+掺杂 光催化 

分 类 号：TE624[石油与天然气工程—油气加工工程] TQ13[化学工程—无机化工]