用于环境功能涂料的纳米TiO_2/SiO_2复合光催化剂的制备工艺  

Preparation of TiO_2/SiO_2 Composite Nano-particles for Environmental Function Coatings

作　　者：姜洪泉[1,2] 王鹏[1] 钟敏[1] 许秋颖[1] 郑丽娜[1] 陈春云[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,绿色化学与技术研究中心 [2]哈尔滨师范大学,黑龙江哈尔滨150500

出　　处：《高校化学工程学报》2005年第1期113-118,共6页Journal of Chemical Engineering of Chinese Universities

摘　　要：针对环境功能涂料制备过程中 TiO2纳米颗粒在水性涂料中极易团聚、分散性差的问题,以提高分散稳定性和改善光催化氧化活性为目的,采用溶胶-凝胶法,以锐钛矿型纳米 TiO2粉体为载体,Na2SiO3为包覆剂,H2SO4为中和剂,成功地制备了分散性优良、光催化活性可控的纳米 TiO2/SiO2 复合粉体。结果表明,包覆剂用量、包覆温度及中和时间是影响催化剂分散稳定性和光催化活性的主要因素。通过实验优化确定最佳工艺条件为:分散剂5027 用量为 2 %(wt,5027/H2O);分散液 pH 值为 9.5 左右;中和时间为 2h;包覆温度根据对其光催化活性的不同要求可控制为 23℃或 80℃;Na2SiO3用量 6 %(wt,SiO2/TiO2);陈化液 pH 值为 9.0 左右。Silica-coated titania composite nano-particles used in the coatings with environmental function were prepared by the sol-gel method to deposit silica onto the surface of anatase titania nanometer particles in order to enhance the dispersion stability of titania nano-particles and improve their photo-catalytic oxidation activity. The composite nano-particles showed a greater dispersion stability and a better photo-catalytic oxidation activity than those of the titania nano-particles untreated with silica. The results show that the main factors influencing these properties include the amount of coating agent sodium silicate used, coating temperature and neutralization time. The optimal conditions found are as follows: dispersing nanometer titania with organic dispersant agent 5027 of 2% (wt, 5027/H2O) at pH 9.5; coating with sodium silicate of 6% (wt, SiO2/TiO2) at 23°C (or 80°C, chosen according to different requirements for photo-catalytic activity); neutralizing for 2 h and aging at pH 9.0.

关 键 词：纳米TIO2 表面包覆 二氧化硅 分散稳定性 光催化氧化 功能涂料 

分 类 号：TQ426.6[化学工程] TQ134.11