Study On The Efficiency And Mechanism Of Removal Of Congo Red By Membrane Adsorption Coupled Photocatalytic Regeneration System

The dye industry in our country is currently developing rapidly,and the difficulty of wastewater treatment is gradually increasing.The proper treatment of huge amounts of dye wastewater has become a bottleneck for the development of the industry.This subject research combines the advantages and disadvantages of traditional adsorption method and photocatalytic degradation of dye wastewater treatment technology,and designs a coupling system of membrane adsorption and photocatalytic regeneration.The membrane adsorption system uses the functional groups on the CCTP composite membrane to select Congo red.Highly effective adsorption.The photocatalytic system uses the good photocatalytic performance of the loaded CCT material to achieve the degradation and removal of the Congo red adsorbed on the surface of the film,and the photocatalytic film can be environmentally regenerated and continue to be recycled.Through the coupling of the two systems,the efficient adsorption and degradation removal of the organic dye Congo red,the recovery of the photocatalyst and the environmental protection regeneration are realized,which is of great significance for the treatment of dye wastewater.Analyze the physical and chemical properties of the composite material through a variety of characterization methods,and adjust the appropriate component ratio to achieve the best adsorption performance and photocatalytic regeneration performance of the membrane material.In the study of the adsorption efficiency of the composite membrane on Congo red,it was found that the composite material has the best adsorption performance when the addition amount of CCT composite material is 0.2 g and the ratio of Cu₂（OH）₂CO₃ and g-C₃N₄/TiO₂ is 1:1.At 100 min,the degradation rate of 20 mg CCTP-2 composite membrane to 50 m L of Congo red with an initial concentration of 40mg/L was>80%,and at 160 min,the degradation rate was>90%.The composite membrane showed the best adsorption efficiency for Congo red at pH 5.The study on the adsorption characteristics of CCTP composite membranes found that the pseudo-second-order kinetics is more suitable for the adsorption behavior of composite membranes on Congo red.The Freundlich equation fits the adsorption isotherm better.The adsorption process is mainly a combination of physical adsorption and chemical adsorption.And found that the composite membrane has adsorption specificity for anionic dyes.Through infrared spectroscopy analysis of functional group changes,XPS analysis of element morphology and chemical bond changes,it is concluded that the adsorption mechanism of the composite film on Congo red is mainly a combination of electrostatic adsorption and coordination.In the study of the photocatalytic regeneration efficiency of the composite membrane,it is found that when the ratio of Cu₂（OH）₂CO₃ and g-C₃N₄/TiO₂ in the composite membrane is 1:1,the composite membrane has both good adsorption and photocatalytic regeneration capabilities.As the amount of CCT material added to the CCTP composite membrane increases,the adsorption effect of the composite membrane after regeneration is better,and it has a higher photocatalytic efficiency.The optimal amount of CCT material added is 0.2 g.With the increase of the number of cycles,the adsorption capacity of the composite membrane after photocatalytic regeneration is gradually reduced,but the removal rate of the composite membrane can still reach 45%within 4 h after five cycles.The photocatalytic regeneration mechanism of the composite film is:O₂^-is generated by the reaction of photogenerated electrons and dissolved oxygen,and the photogenerated holes migrate between the valence bands in the direction from TiO₂ to g-C₃N₄,superoxide radicals and g-C₃N₄ valence More photo-generated holes on the surface of the belt can oxidize Congo red into small molecules.In order to be closer to practical applications,adsorption filtration and photocatalytic regeneration experiments were carried out,mainly to explore the changes in parameters such as membrane flux and membrane resistance before and after the composite membrane adsorbed and filtered Congo red.The study found that the composite membrane has good adsorption and filtration performance,can effectively trap Congo red,and can be repeatedly adsorbed through photocatalytic regeneration.The regeneration method is environmentally friendly,and the adsorption is selective and efficient,and has certain application prospects.Based on the above research,the membrane adsorption coupled photocatalytic regeneration system constructed in this topic can achieve the efficient removal of the organic dye Congo red,and the composite membrane has good photocatalytic regeneration performance and cyclic adsorption efficiency.That is,the removal of pollutants and the efficient regeneration and reuse of materials are realized at the same time,and the performance is excellent.