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以钛酸四丁酯为主要原料,无水乙醇做溶剂,冰醋酸做抑制剂,盐酸做负催化剂,采用溶胶-凝胶法制备纳米TiO2。正交试验分析研究了溶剂量,加水量,抑制剂量,凝胶温度,搅拌速率等对TiO2溶胶-凝胶形成过程以及凝胶时间的影响,总结出了制备稳定溶胶的制备工艺及影响TiO2光催化性能的主要因素。结果表明:从经济性角度考虑,凝胶时间应控制在15~25h,可以确定影响顺序为:水>反应温度>冰醋酸>乙醇>搅拌速度,实验最佳比例为钛∶乙醇∶水∶冰醋酸=3∶25∶2∶1.2,最佳反应温度为25℃。在以上合成条件下,450℃条件煅烧后,投入0.2g催化剂光降解10mg/L的甲基橙光降解效果最好。
Taking tetrabutyl titanate as the main raw material, anhydrous ethanol as solvent, acetic acid as inhibitor and hydrochloric acid as negative catalyst, nano-TiO2 was prepared by sol-gel method. The effects of the amount of solvent, the amount of water added, the dosage of inhibitor, the temperature of the gel and the stirring rate on the sol-gel formation process and the gel time were investigated by orthogonal test. The preparation process of the sol and the effect of TiO2 light The main factor of catalytic performance. The results showed that the gelation time should be controlled within 15-25h from the economic point of view, and the order of influence could be determined as follows: water> reaction temperature> glacial acetic acid> ethanol> stirring speed. The optimum ratio of experiment was titanium: ethanol: water: ice Acetic acid = 3:25: 2: 1.2, the optimal reaction temperature is 25 ℃. Under the above conditions, after calcination at 450 ℃, methyl orange with photodegradation of 10mg / L by 0.2g catalyst had the best photodegradation efficiency.