Study On Catalytic Degradation Of Dye Wastewater By Bimetallic Fenton Catalyst

With the acceleration of country’s industrialization process,the printing and dyeing industry has developed rapidly in China.However,the waste water generated in the printing and dyeing process has brought a huge burden to the environment.Advanced oxidation method is a method that can efficiently remove pollutants.Fenton can destroy pollutants indiscriminately due to the strong oxidizing·OH produced.However,the traditional Fenton is only effective under acidic condit ions and has weak cycle stability,and its practical application is greatly limited.In order to overcome the disadvantages of traditional Fenton,researchers have developed a heterogeneous Fenton catalyst.Carbon nitride has the characteristics of good stability,good electronic energy band,good electron transfer performance,low cost,and easy preparation.It is a widely used carrier material.Sulfur doping can significantly shorten the electron transfer path and accelerate the electron transfer.The modification of oxalic acid can significantly increase the specific surface area and provide more reactive sites.Using Cu and Co as active components,the p H adaptability range of Cu is faster,the reduction rate is faster,the bimetal can play a synergistic effect,and the introduction of Co can reduce the leaching of Cu.Fe and Mo are selected as active components,and Mo can strengthen the Lewis acidity of the iron-based catalyst and broaden the p H range of the Fenton reaction.In this paper,using dicyandiamide as the precursor of carbon nitride and thioacetamide as the precursor of sulfur,a copper-cobalt co-supported sulfur-containing carbon nitride（Cu Co/SCN）heterogeneous Fenton catalyst was prepared by pyrolysis.Characterization by SEM,TEM,XPS,etc.proved the successful loading of Cu and Co.Experiments show that the use of carbon nitride as a carrier can shorten the electron transfer path,and the synergy of the bimetal can accelerate the Fenton reaction process,at a reaction temperature of 30℃,p H=7,Cu Co/SCN dosage is 0.8 g/L,H₂O₂ concentration is 15 m M,20 mg/L MO can be completely removed within 1 h.The catalytic performance of the catalyst did not decrease significantly after being used for 5 times.EPR characterization proves that·OH and·O₂^-play a major role in degradation.In this paper,an iron-molybdenum co-supported cyclic carbon nitride（FeMo/GICN）heterogeneous Fenton catalyst was prepared by pyrolysis.Through the characterization technique,the successful loading of Fe and Mo was proved.Experiments show that when p H=3,FeMo/GICN dosage is 0.2 g/L,and H₂O₂concentration is 5 m M,20 mg/L of MO can be completely removed within 1 h.The catalytic performance of FeMo/GICN catalyst did not decrease significantly after being used for 5 times.EPR characterization proves that·OH and·O₂^-are the main active free radicals in the FeMo/GICN/H₂O₂ system.