H2O2-TiO2/Lithium Silicon Powder Photocatalytic Degradation of DMP

Abstract

TiO /Li-Si powders were prepared by precipitation method and the photocatalytic degradation of DMP wastewater was carried out in combination with hydrogen peroxide. The effects of the amount of catalyst, the amount of hydrogen peroxide added, and the initial concentration of DMP on the degradation rate were investigated; the degradation kinetics and the degree of organic mineralization were also analyzed. The results showed that the optimal catalyst dosage was 5 g/L, and the initial concentration of DMP was 24 mg/L. Under the optimal conditions, the degradation rate of DMP was 68.52% and the mineralization rate was 56.29%. The degradation rate was in accordance with the first-order kinetic equation. After adding 0.8ml/L of 30% hydrogen peroxide under optimal conditions, the degradation rate of DMP increased to 74.44% and the mineralization rate increased to 68.36%.