制备条件对纳米TiO_2晶型及其晶相含量影响的研究  

Influence of Preparation Conditions on Nano TiO_2 Crystal Phase Structure

作　　者：周武艺[1] 唐绍裘[1] 万隆[1] 李得意[1] 张世英[2] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]长沙大学化学系,湖南长沙410003

出　　处：《稀有金属》2004年第4期631-634,共4页Chinese Journal of Rare Metals

基　　金：湖南省自然科学基金资助项目 ( 0 2JJY3 0 47)

摘　　要：分别用TiCl4 ,Ti(SO4 ) 2 和Ti(OC4 H9) 4为原料制备纳米二氧化钛粉体。用XRD和TEM对纳米二氧化钛粉体的晶型及晶粒形貌进行了分析。研究了在同一条件下制备的 3种纳米二氧化钛粉体对光催化降解亚甲基蓝溶液的影响 ;结果表明 :在相同的制备条件下 ,用TiCl4 为原料制备的纳米二氧化钛晶型较易控制 ,容易得到含有一定金红石相、催化活性较高的混合晶型的纳米二氧化钛 ;因此 ,其降解效果优于其他两种。同时研究了外界条件 (如分散剂、干燥方式、温度及烧结温度等 )对纳米二氧化钛晶相及其含量变化的影响。实验结果为 :用异丙醇做分散剂时 ,当分散剂与水的体积比为 3时 。TiO 2 nanopowders were prepared by hydrolyzing titanium salt and characterized by XRD and TEM for obtaining the crystal types and the morphology. Comparing with hydrolyzing Ti(SO 4) 2 and Ti(OC 4H 9) 4, the TiO 2 nanopowders with excellent photocatalysed activity property are obtained easily by hydrolyzing TiCl 4 in the same conditions, which represent the highest efficiency for photocatalytic degradation of methylene blue. The effect factors on the crystal phase content of TiO 2 nanopowders, including dispersant solution, drying methods and calcining temperature etc, were investigated too. The results show that the uniform sphere TiO 2 nanopowders may be obtained when the volume ration of isopropylalcohol and water reached 3 by freeze drying method.

关 键 词：纳米二氧化钛粉体 晶相含量 光催化降解 

分 类 号：TB383[一般工业技术—材料科学与工程]