【摘要】 采用化学沉积法在粉石英表面包覆TiO2,研究了TiOSO4—H2O—SiO2反应体系的温度、水解时间、晶种、表面活性剂等因素对包覆的影响;利用SEM,XRD,IR等对复合粉体的形貌、组成、表面官能团等进行表征.结果表明:化学沉积过程中采用自生晶种、并有表面活性剂作用下,水解温度95℃,粉石英-硫酸氧钛水溶液体系保持5 h,能制备出包覆效果良好的复合粉体,白度最高可达93.4,复合粉体中粉石英表面包覆致密的锐钛型TiO2,二者以化学键结合,强度较高.更多还原

【Abstract】 Compound powder was prepared from quartz powder coated with titanium dioxide by a chemical deposition method.The effects of reaction temperature, hydrolysis time,seeds and the surfactant in TiOSO4—H2O—SiO2 system on coating were studied,and the morphology,composition and surface functional groups of the compound powder were characterized by SEM,XRD and IR,respectively.The results show that well coated compound powder can be obtained using self-growing seed during chemical deposition in the presence of surfactant and under optimized reaction conditions at hydrolysis temperature of 95 ℃,lasting 5 hours for the quartz powder TiOSO4 water solution system.The whiteness of derived compound powder is up to 93.4.The compact anatase titanium dioxide is coated on the surface of kernel quartz powder,and the kernel and shell components are linked by chemical bond which results in the high coating intensity.更多还原