No abstract

Methylene blue simulated wastewater was treated with a UV-H 2 O 2 combined system. Influences of factors such as reaction time, initial pH value and H 2 O 2 dosage were investigated, and the reaction kinetics of the process was explored. Results showed that the degradation of methylene blue happened only in the presence of both conditions: UV irradiation and H 2 O 2 addition. Initial pH and H 2 O 2 dosage had a remarkable influence on the degradation efficiency. Through several groups of univariate experiments, the optimum pH and H 2 O 2 dosage of the photolysis process were found to be 4-5 and 0.165 mL 30% H 2 O 2 per milligram of methylene blue, respectively. The photolysis process was relatively fast at the initial stage and, 20 min later, it was approximately in accordance with the first-order kinetic equation.

Reactive dye BES golden yellow simulated wastewater was treated with H(2)O(2)-assisted photolysis method. Influences of factors such as reaction time, initial pH and H(2)O(2) dosage were investigated, and the reaction kinetics of the process were explored. Results showed that, the degradation of 200 mg/L BES golden yellow solution happened only in the presence of both conditions: UV irradiation and H(2)O(2) addition. Initial pH and H(2)O(2) dosage had remarkable influence on the removal efficiency of the dye. Through several groups of univariate experiments, the optimum pH and H(2)O(2) dosage of the photolysis process were found to be 6-7 and 0.0375 mL 30% H(2)O(2) per milligram of BES golden yellow, respectively. The photolysis process was approximately in accordance with the second-order kinetic equation.

No abstract

Effects of H 2 O 2 on the photolysis of acetamiprid under irradiation of low or medium-pressure mercury lamp were studied. The results showed that the photolysis of acetamiprid follows pesudo-first-order kinetics, the presence of H 2 O 2 can obviously promote the photolysis of acetamiprid under the irradiation of both low-pressure mercury lamp and medium-pressure mercury lamp, the promoting effect of H 2 O 2 on the photolysis of acetamiprid under irradiation of low-pressure mercury lamp was stronger than that under irradiation of medium-pressure mercury lamp, the promoting effects of H 2 O 2 on the photolysis of acetamiprid is perhaps due to the formation of hydroxyl radical when H 2 O 2 irradiated by UV.