SiO_2纳米干凝胶的合成和表征

SYNTHESIS AND CHARACTERIZATION OF NANO-SIZED SILICA GELS

以水玻璃和盐酸为原料 ,通过添加表面活性剂的方法制备SiO2 纳米干凝胶 ,并对其制备条件进行了研究 ;用BET ,DTA TGA ,IR ,XRD ,TEM等手段对样品的结构和性能进行了表征。结果表明 ,合成SiO2 纳米干凝胶的最佳工艺条件为 :水玻璃质量浓度 ,4 0 g/L ;盐酸浓度 ,5mol/L ;表面活性剂质量浓度 ,50 g/L ;老化时间 ,1h ;煅烧温度 ,6 0 0℃。该样品的比表面积可达 998m2 / g ,对锆的静态吸附容量为 0 344mmol/

Silica gels with the high specific surface area and the high adsorption activity have been prepared from water glass and HCl through the process of adding surfactant. DTA TGA, BET, XRD, IR, TEM and some other methods are used to characterize the structure and performance of silica gels. The optimum technical conditions are as fallows: water glass content, 40 g/L; HCl concentration, 5 mol/L; surfactant content, 50 g/L; calcining temperature, 600 ℃; aging time, 1 h . The specific surface area of the silica gel is found to be 998 m 2/g: The static sorption capacity for zirconium reaches 0.344 mmol/g.