Research on the Application of Key Technologies for Environmental Governance and Resource Recycling

Abstract

With the acceleration of urbanization and the increase of pollutant discharges in China, the pollution load of water body in many cities have exceeded the natural self-purification capacity of water bodies, resulting in the deterioration of water quality, or even the occurrence of black and odorous water bodies. The urban black and odorous water bodies, as current water environment issue in China, have aroused a strong public concern. In this paper, the origin and pollution source of black odor in water are analyzed from the aspects of point source, non-point source, endogenous and hydrodynamic conditions. Subsequently, the TiO2/g-C3N5 composite photocatalytic material was prepared by hydrothermal method and high temperature calcination method. The results showed that the degradation rate of methylene blue (MB) reached 91.5%and the degradation rate of tetracycline hydrochloride (TCH) reached 92.4%in 105 min. The high degradation rate can be attributed to the effective combination of the introduced TiO2 and g-C3N5 to form a heterojunction, with the excellent visible light response characteristics of g-C3N5, the photocatalytic performance is significantly improved.