二氧化硅/二氧化钛复合材料合成条件对其处理含氰废水性能的影响

Effect of Synthesis Conditions of SiO_2/TiO_2 Composite on its Capacity to Treat Cyanide Wastewater

以乙醇为有机溶剂,硅酸钠和钛酸丁酯为原料,采用凝胶溶胶法制取二氧化硅/二氧化钛复合催化吸附材料,并进行热重分析来表征。结果表明,最佳制备条件为:硅酸钠∶钛酸丁酯∶乙醇∶水=7∶5∶30∶20(体积比),pH=2,硅酸钠用量30mL,继续搅拌时间4h,焙烧温度450℃,焙烧时间2h。此条件下制备的材料用于含氰废水处理,铜吸附量最大,氰分解率也最大。

SiO2/TiO2 composite was produced by as solvent, sodium silicate and butyl titanate as sol-gel method and characterized by TG test with ethanol raw materials. The results show that the optimum conditions include volume ratio of sodium silicate, butyl titanate, ethanol, and water of 7 ： 5 ： 30 ： 20, pH=2, sodium silicate dosage of 30 mL, continuous string time of 4 h, roasting temperature of 450 ℃, and roasting time of 2 h. With the composite, copper is well adsorbed and cyanide is well separated from wastewater.