Study On Oxidation And Photocatalytic Properties Of RhB By Metal-Modified Carbon Nitride Materials

In recent years,the international community has been very concerned about the deterioration of environmental quality and the imbalance of ecological balance,and mankind is facing the most serious environmental crisis in history.Statistics show that industrial sewage accounts for half of the global sewage discharge,and the discharge of dye wastewater accounts for more than one-third of all industrial sewage,and this proportion is still increasing year by year.Moreover,the treatment of dye wastewater is difficult,and the cost is high.Some dyes are classified as typical organic and highly toxic pollutants,which harm the environment and human health.Therefore,the effective treatment of organic wastewater to reduce environmental pollution,protect the human living environment,and reduce the damage of organic carcinogens to human health is a long-term and important problem to be solved.In this paper,Fe-Mo-O doping g-C₃N₄exfoliated composite was prepared by dispersing Fe-Mo-O on the surface of g-C₃N₄and characterized by XRD,FT-IR,UV–vis,SEM,TEM,XPS and N₂adsorption–desorption techniques.The results show that the as-prepared composite composed of Mo O₃,Fe Mo_yO_xand exfoliated g-C₃N₄crystals.Using the composite material in the degradation of Rhodamine B（RhB）by advanced oxidation,it can be found that H₂O₂is rapidly decomposed on the composite catalyst,showing a high efficiency of Rhodamine B degradation.When the catalyst mass is 9 mg and the H₂O₂dosage is 0.1 m L,the degradation rate reaches 99%in 15min oxidation time.By studying the catalytic effect of each component of the catalyst,it is revealed that the presence of Fe²⁺in the composite catalyst makes the decomposition of H₂O₂more rapid and the degradation of RhB more radical.At the same time,the composite showed high photocatalytic degradation of RhB under visible light.When the concentration of RhB was 10 mg/L,the amount was 100 m L and the catalyst mass was0.3 g,the degradation rate could reach more than 99%after 30 min dark adsorption and60 min photocatalytic process.The high catalytic activity for advanced oxidation and photocatalysis was mainly ascribed to the Fe/Mo dual ion synergy system that could effectively protect the catalytic cycle of Fe（II）,or heterojunctions on exfoliated g-C₃N₄that could inhibit the recombination of photogenerated electrons and holes.Moreover,the recovery and reuse performance of the composite catalyst during advanced oxidation and photocatalytic degradation reactions were studied,and the experimental results showed that the catalyst showed excellent recovery and reuse performance.