Degradation Of Organic Wastewater By Semiconductor Oxide Composite Photocatalyst And Its Application

The current environmental pollution problem is increasingly prominent,and the organic pollutants were a serious threat to the healthy life of human beings.Advanced oxidation technologies such as photocatalysis,Fenton and ozone oxidation can produce hydroxyl radicals?·OH?with strong oxidizing power under different conditions to achieve advanced treatment of organic pollutants in wastewater.The Fe₂O₃/TiO₂ composite was constructed to realize the deep degradation of organic matter,and H₂O₂ was added under visible light irradiation to form photocatalytic-Fenton synergy system,which could degrade 90%of MB after irradiation for 3 min,which was3.75 and 15 times than the photocatalytic and Fenton reaction degradation activity.By using the valence cycle of Fe ions in the system,the recombination of photogenerated charges is effectively avoided,and Fe²⁺reacts with H₂O₂ to form strong oxidizing·OH,thus promotes the degradation of organic pollutants.The g-C3N4/TiO2 composite was prepared by ultrasonic and chemical mixing method,and the g-C₃N₄/TiO₂ photocatalytic-ozone synergy system was constructed to realize the deep degradation of phenol by photocatalysis-ozone oxidation.After irradiation for 4 min,the degradation rate of phenol was 88%,which is 17 and 1.6 times higher than that of photocatalytic and ozone oxidation,respectively,and the photocatalytic-ozone synergy system has good reusability.The Cu₂O/Bi₂WO₆ composites were synthesized via the interfacial self-assembly method.The Cu₂O nanodots are uniformly modified on the surface of Bi₂WO₆ with an average particle size of about 20 nm.The introduction of Cu₂O enhances the use of visible light,accelerates the separation efficiency of charge carriers,and synergistically enhances the photocatalytic activity of the composite.The 3%Cu2O/Bi2WO6 composite displayed the best degradation activity,which could degrade about 96%MB solution after 120 minutes.Figure 36;Table 4;Reference 83...