The Study About The Preparation Of Graphite Phase Carbon Nitride Composite Photocatalysts And Its Removal Of Tetracycline In Water

Antibiotic pollution in wastewater has become a prominent environmental risk problem,which has attracted the attention of some researchers.Tetracycline is difficult to degrade in the soil by itself,it will stay in the soil for a long time,and it is easily absorbed by plants and enters the human body,endangering health.Therefore,tetracycline is one of the most used and difficult to deal with among many antibiotics.Traditional water treatment technology is difficult to completely remove antibiotics in wastewater.Photocatalytic technology has the advantages of thorough oxidation,rapid reaction,simple reaction conditions,etc.It is a green and resource-saving wastewater treatment technology,and has great potential in dealing with environmental pollution problems.g-C₃N₄has an appropriate mid-band gap,which can effectively absorb visible light.In addition,its oxidation-reduction potential is suitable for the decomposition of water.More importantly,the ability to flexibly use metal capture modification to form abundant active sites is another important aspect of improving photocatalytic performance.All these characteristics make it a promising photocatalyst material.In this study,Ni-MOF/g-C₃N₄catalysts with different doping ratios were successfully prepared by hydrothermal method.The composite material can effectively promote the removal of tetracycline.Adjust the doping amount of the ligand compound,set the initial concentration of pollutants with different concentrations,and change the catalyst input to study the influence of these influencing factors on the photocatalytic degradation of tetracycline.The experimental results show that when the amount of catalyst is 1 g L^-1and the doping amount of coordination compound is 5%,the catalytic activity of the composite material we prepared is the highest.And Ni-MOF/g-C₃N₄has good stability and recyclability,and its chemical structure is quite stable.At the same time,we found that the catalytic performance of the modified g-C₃N₄has been improved,but it has not fully achieved the degradation effect we want,so we combined the oxidation of persulfate under light conditions to explore the photocatalytic technology.The impact of the latest photocatalytic oxidation technology on the removal of pollutants from materials.We studied the oxidative degradation of tetracycline（TC）in water by ferrocene modified graphite phase carbon nitride（Fe/g-C₃N₄）activated persulfate（PS）under light-assisted conditions.A series of characterization of the material was carried out,and the influence of the amount of persulfate in the reaction system,the initial pollutant concentration,the amount of catalyst and the p H value and other factors were studied.When the amount of PS added reaches2.5 m M and the amount of catalyst is 1 g L^-1,Fe/g-C₃N₄/PS/Vis shows the best performance.Within 60 minutes,the removal rate of tetracycline under its natural p H value reached 93%.In the reaction system,acidic neutral conditions are more conducive to the degradation of TC.The results show that the doping of ferrocene inhibits the recombination of electron-hole pairs in g-C₃N₄,expands the light response range,and improves the photocatalytic removal rate of tetracycline.At the same time,the iron cycle produced by the ferrocene modification helps to activate the persulfate to generate superoxidative sulfate,hydroxyl,superoxide and vacancies.The synergy between photocatalysis and PS activation promotes the production of active substances and the removal of tetracycline.The results show that Fe/g-C₃N₄photocatalytic activation of persulfate is an effective method to remove tetracycline from water.