光催化降解硝基C酸废水的实验研究

Experimental Study on Photo Catalytic Degradation of Nitro-C Acid Wastewater

以TiO2-P25作为光催化剂,250 W高压汞灯为光源,对硝基C酸废水和预处理后的废水进行了光催化降解实验,研究了初始浓度和酸度、溶液的pH值、催化剂用量以及外加氧化剂用量等因素对有机物降解效果的影响.结果表明,溶液的初始浓度和酸度、pH值、催化剂用量以及外加氧化剂用量等对硝基C酸废水的降解效果影响较大.预处理前的废水COD为2 050 mg/L、酸度(以H2SO4计)为31.2 g/L、初始pH为0.26、催化剂用量为0.3 g/150 mL,外加氧化剂K2S2O8量为0.5 g/150 mL,紫外光照射4 h去除率为41.3%;预处理后的废水COD为518 mg/L、酸度26.5 g/L、初始pH为0.75,当催化剂TiO2-P25用量为0.1 g/150 mL溶液时,光照4 h去除率达到68.4%.

Photocatalysis degradations of nitro-C acid wastewater and the nitro-C acid wastewater after pretreatmeut were studied by TiO2-P25 as photo catalyst and a 250W mercury lamp of high pressure as light source. The effects of initial chemical oxygen demand （COD） and acidity, initial pH, and the amount of TiO2-P25 and additional oxidant amount on the removal efficiency of organic of solution were investigated, and the results showed that these factors had a great influence on the removal efficiency of organic of solution. The removal efficiency of nitro-C acid under UV-light illuminated 4 h is 41.3% with initial COD of 2 050 mg/L, acidity of 31.2 g/L, pH of 0.26, K2S2O8 dosage of 0.5 g, TiO2-P25 dosage of 0.3 g/150 mL, and the removal efficiency of nitro-C acid after pretreatment under UV-light illuminated 4 h comes to 68.4% with 518 mg/L of initial COD, 26.5 g/L of acidity, 0. 75 of initial pH, when TiO2-P25 dosage is 0. 3 g/ 150 mL.