酸催化剂对TiO_2溶胶晶粒形貌及光催化性能的影响  

Influence of Acid Catalyst on Crystalline Microstructure and Photocatalytic Property of TiO_2 Sol

作　　者：蔡振钱[1] 高基伟[1,2] 申乾宏[1] 王平[1] 杨辉[1,2] 

机构地区：[1]浙江大学材料科学与工程学系,浙江杭州310027 [2]浙江大学绿色建材与应用技术工程研究中心,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期62-65,共4页Rare Metal Materials and Engineering

基　　金：浙江省科技计划(2006C11179);浙江省科技计划(2007C21110)

摘　　要：采用溶胶-凝胶法,以钛酸丁酯为前驱体,常温合成含有一定晶型晶粒的TiO2溶胶,考察了不同种类的酸催化剂对二氧化钛纳米晶形貌和光催化活性的影响。采用X射线衍射、透射电镜、扫描电镜等测试手段分析样品中纳米晶的微观形貌与结构,并以罗丹明B为目标催化物测试了溶胶的光催化性能。实验发现,酸根对纳米晶的结晶类型有很大的影响:盐酸和硝酸作催化剂时,为锐钛矿和板钛矿;硫酸、氢氟酸和醋酸为催化剂时则为锐钛矿。其中,硫酸为催化剂制备的溶胶光催化性能较好。Titania sol containing nano crystals was prepared by sol-gel method, using Ti （OC4H9）4 as a precursor at low temperature. The influence of different acid catalyst on crystalline microstructure and photocatalytic activity of TiO2 sol was investigated. The as-prepared sol was detected by X-Ray Diffraction（XRD） and the transmission electron microscope（TEM） analysis. The photocatalytic activity of the sol was carried out by photocatalytic decomposition of Rhodamine B. The results indicate that the crystalline types of the nano crystals in the sols are determined by the acid catalyst： when the catalyst is hydrochloric acid or nitric acid, the crystalline types are anatase and brookite, while vitriol acid, hydrofluoric acid or acetum result in getting anatase type crystals. The sol, using vitriol acid as catalyst, has the highest photocatalytic activity.

关 键 词：酸催化剂 二氧化钛溶胶 光催化 

分 类 号：O643.36[理学—物理化学]