Preparation And Photocatalytic Properties Of Fenton-like Catalysts Based On Graphite Nitride Carbon

The Fenton oxidation method is popular for its fast,efficient,economical and environmental-friendly,but it has efficiency catalytic performance only under strict acidic conditions and produces large amounts of iron mud.Heterogeneous Fenton is applied to a large pH range without precipitation of iron hydroxide,but the regeneration rate of Fe2+in heterogeneous Fenton reaction is slow.Under the action of light,the utilization efficiency of the catalyst can be greatly improved.In order to improve the recovery efficiency of the powder catalyst,the iron-based materials with magnetic recovery properties were prepared.The specific contents are as follows:(1)A catalyst material was synthesized from ferrous oxalate and g-C3N4 in a simple and environmentally friendly way.The composite material FeC2O4/g-C3N4 was characterized by SEM,EDX,XRD,XPS,FT-IR,PL and UV-vis/DRS.The degradation performance of Rhodamine B by catalyst under visible light excitation was investigated.The experimental results show that the combination of g-C3N4 and ferrous oxalate is crucial to enhance carrier separation and O2 reduction in visible light,which also promotes the generation of hydroxyl radical(·OH).In this system,oxalate is used to assist the transformation of Fe2+and Fe3+,and to chelate with Fe3+ to form complex,so as to avoid the formation of sludge.In addition,without the addition of hydrogen peroxide(H2O2),the system has a good photodegradation effect.(2)The magnetic ternary composite catalyst,α-Fe2O3/g-C3N4/CuO,was prepared by simple high-temperature calcining method,and its morphology and chemical composition were characterized by SEM,EDS,XRD,XPS analytical methods.The response surface method was used to explore the optimal conditions affecting the preparation of composite materials,the performance of catalyst was evaluated by using the organic dye RhB,and the influence of different factors on the degradation of pollutants in the reaction process was analyzed.The results showed that the catalyst is obtained by response surface method to determine the optimal preparation conditions for Fe and Cu in the mole ratio of 1.5,Fe and melamine ratio is 2.5%,the quality of the calcination time is 3.9 h,the model to predict the degradation rate of 83.3%,after three parallel experiments,the degradation rate was 82.3%,with the model prediction relative error of 1%,error is small,show that the model can well predict experimental research on catalysts for degradation of rhodamine B.By degrading pollutants,the degradation rate can reach 85%even at pH=10.Photo-Fenton reactions under neutral or alkaline conditions have low catalytic efficiency.Figure[23]table[6]reference[129]...