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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
Using inorganic titanium salt as precursor and PEG and starch as dispersants, nano-TiO2 powder was prepared by sol-gel method and modified sol-gel method. In an improved method, TiO2 is obtained by dissolving the gel instead of the conventional high temperature burning gel. The resulting product was a very fine (4 nm) TiO2 powder that had apparently begun to crystallize (anatase). This powder can be used as a starting material for the heating process to control the particle size of TiO2. Crystallization of TiO2 at very low temperatures (≤10 ° C) is presumed to be due to the special gel structure consisting of a polymer crosslinked with Ti (NO3) 4. In the improved method, a small amount of NO2 gas can be easily absorbed, and at the same time, the repeatedly dissolved polymer can be reused. Therefore, this method is conducive to environmental protection in industrial production