Abstract:

TiO₂ nanoparticles have been prepared by strong acid controlled hydrolysis. The effect of its suspended solution on the activity and rule of photo-catalysis degradation of the simulated dye wastewater containing cationic brilliant red 5GN has been studied. The results showthat 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.

Key words: nano TiO₂, photocatalytic activity, cationic brilliant red 5GN

摘要：

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。

关键词: 纳米二氧化钛, 光催化性能, 阳离子艳红5GN

CLC Number: 

• X791

• X703.1