化学沉淀法制备纳米Fe/TiO_2及其光催化活性的研究  

Preparation and Photocatalytic Activity of Nanoparticle Fe/TiO_2 by Chemical Precipitation Method

作　　者：陈桂华[1] 葛昌华[1] 潘富友[1] 赵波[1] 杨辉[2] 王明星[1] 

机构地区：[1]台州学院医药化工学院,临海317000 [2]浙江大学纳米科学与技术中心,杭州310027

出　　处：《人工晶体学报》2010年第2期433-439,共7页Journal of Synthetic Crystals

基　　金：浙江省科技计划资助项目(2008R10037);浙江省教育厅项目(Y200906690)

摘　　要：以TiCl4为钛前驱体,氨水为沉淀剂,氯化铁为掺杂离子给体,采用化学沉淀法,制备了纯的与铁掺杂的TiO2纳米光催化剂。采用XRD、差热-热重等分析方法对产物进行了表征。通过苯酚水溶液的光催化降解实验研究了样品的光催化性能,考察了Fe3+掺杂量、苯酚溶液的pH值对光催化活性的影响。结果表明:Fe3+掺杂抑制了晶粒长大,细化了晶粒。Fe3+取代晶格中Ti4+的位置或进入间隙位置,引起晶格畸变。适量的Fe3+掺杂能减少光生电子与空穴的复合,提高光催化剂的光催化性能。在本实验条件下,Fe3+掺杂量为0.1 mol%,苯酚溶液的pH为9时,纳米TiO2具有最佳的光催化性能,在20 W紫外灯照射下降解16 h,降解率达到89.3%。The pure and Fe-doped TiO2 nanoparticles photocatalyst were prepared by chemical precipitation,using titanium tetrachloride as Ti-precursor,ammonia as precipitant and ferric chloride as doping-ion donor.The samples were characterized by X-ray diffraction（XRD） and thermogravimetry and different thermal analysis（TG-DTA）.The photocatalytic activity was evaluated by the photocatalytic decomposition of phenol.The effects of the doping content of Fe3＋ and phenol solution pH on the activity were investigated.The results showed that Fe3＋ doping retards the growth of grain size.Fe^3＋ locate at interstices or occupy some lattice of TiO2,which lead to crystal lattice distortion.An appropriate amount of Fe3＋ in TiO2 powders reduces the recombination of photo-generated holes and electrons,which contribute to the enhancement of the photocatalytic activity of Fe3＋-doped TiO2.In this experimental condition,TiO2 nanoparticles have the optimal photocatalytic property when the doping content of Fe^3＋ is 0.1 mol% and pH of phenol solution is 9;the degradation efficiency of phenol is 89.3% after 16 h irriation using 20 W UV light.

关 键 词：光催化剂 化学沉淀法 苯酚 二氧化钛 

分 类 号：O648[理学—物理化学]