受控水解法制备纳米TiO_2光解染料废水的研究

Photocatalytic degradation of dye wastewater using TiO_2 nanoparticles prepared by a controlled hydrolysis method

以强酸性控制水解法制备了纳米TiO2,结合XRD表征,研究了其悬浊液对含阳离子艳红5GN的模拟染料废水进行光催化降解的活性和规律。结果表明:在强酸性控制水解法中,500℃焙烧纳米TiO2催化剂具有最高催化活性,对比沉淀法和sol-gel法制备的纳米TiO2,其对阳离子艳红的降解速率提高了1.34倍和2.81倍;实验确定的优化降解条件为:6W紫外光照、阳离子艳红5GN初始质量浓度为20mg/L、催化剂投加量为1.5～2.0g/L和空气曝气器功率2.50W,此时阳离子艳红5GN在1h内的降解率>90%;在阳离子艳红5GN初始质量浓度为10～40mg/L时,其降解过程遵循一级反应规律。

TiO2 nanoparticles have been prepared by solution on the activity and rule of photo-catalysis d strong acid controlled hydrolysis. The effect of its suspended egradation of the simulated dye wastewater containing cationic brilliant red 5GN has been studied. The results show that in the strong acid controlled hydrolysis,when nano TiO2 is baked over a slow fire at 500 ℃ ,the catalysis has the highest catalytic activity. Comparing the TiO2 prepared by precipitation and sol-gel method,the effect on the degradation rates of cationic brilliant red are 1.34 times and 2.81 times higher respectively. It is determined through experiments that the optimized conditions are：the power of UV irradiation is 6 W,the initial concentration of cationic brilliant red is 20 mg/L,catalyst dosage is 1.5 to 2.0 g/L and the power of aerator is 2.5 W. At this time,the degradation rate of cationic brilliant red reaches more than 90%.When the initial concentration of cationic brilliant red is in the range of 10 to 40 mg/L,its degradation process follows grade 1 reaction rule.