纳米TiO_2在水性介质中的分散研究

Investigation of dispersion for nano-TiO_2 in the aqueous medium

以水为介质,采用物理分散和化学分散结合方法,通过优化分散工艺,制备出稳定的纳米TiO2光催化分散液.用沉降法、激光粒度分析法、透射电镜观察法等评价表征分散液中纳米TiO2的分散效果.结果表明,优化后的分散工艺为：质量分数1%纳米TiO2,1%聚丙烯酸＋0.5%吐温80复合分散剂,超声处理15m in,处理前后高速剪切各30m in.所得分散液中TiO2的粒径均小于100nm,平均粒径~50nm,粒径分布均匀.

Comblined the methods of physical and chemical dispersion, and taking water as solvent, the steady photocatalytic nano-TiO2 dispersed solution was fabricated by optimizing the dispersing technics. The dispersed effect of nano-TiO2 dispersed solution was characterized and evaluated by using the methods of precipitation, analysis of granularity by laser, and observation of TEM. The testing results show that the optimized dispersing technics include the dispersed solution composed of 1% nano-TiO2, 1% polyacrylie acid ＋ 0.5% TW-80, ultrasonic treating for 15 rain, and high-speed cutting for 30 rain before and after the treating; All the TiO2 particle diameter in the dispersed solution is less than 100 nm, with the mean particle diameter of about 50 nm, homogenously distributive.