【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 ,选用冷冻干燥法可得到均分散的粒度可控的球形纳米二氧化钛晶粒更多还原

【Abstract】 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.更多还原