【摘要】 以无机钛盐为前驱体 ,PEG和淀粉为分散剂 ,分别用溶胶 -凝胶法及改进溶胶 -凝胶法制备出纳米TiO2 粉体。在改进方法中 ,用溶解凝胶而不是传统的高温灼烧凝胶的方法得到TiO2 。所得的产物是极细 (4nm )并已明显开始结晶 (锐钛矿 )的TiO2 粉体。此粉末可用作加热法控制TiO2 颗粒尺寸的起始物质。TiO2 在极低温度 (≤ 10 0℃ )下结晶被推测为由聚合物与Ti (NO3 ) 4交联组成的凝胶结构比较特殊所致。在改进的方法中 ,少量的NO2 气体可被容易地吸收 ,同时 ,重复溶解的聚合物可重复利用。因此 ,这种方法在工业生产中有利于环境保护更多还原

【Abstract】 Nanocrystalline TiO₂was prepared by traditional and improved sol-gel methods with inorganotitanates and two polymers（PEG and starch）,respectively.For the improved method,the way separating TiO₂ from dry gel depended on not calcining at all but redissolving the dry gel.The obtained TiO₂ powder is ultrafine（4?nm） and crystallized（anatase phase）,which was acted as the raw material to control TiO₂ particle size by heated-treatment.It was supposed that the crystallization occurring at low temperature（≤100?℃）result from the special structure of gel which formed by the polymers with Ti（NO₃）₄.For the improved method,it was found that a small amount of NO₂ gas can be easily collected and redissolved polymers can be reused.So this method is also good to environment protection.更多还原