Study On The Preparation Of Copper-based Fenton Catalyst And Application For Photo-assisted Oxidation

In this study,copper ions are collected from simulated coppercontaining wastewater by the reaction of hydrogen peroxide and copper ions under alkaline conditions.When the pH value is 12,the copper recovery rate can reach 99%.The recovered product exists copper hydroxide when the hydrogen peroxide concentration is too low.Analytical methods including XPS,XAFS and EPR were used to elucidate the mechanism.Copper exists in the bivalent state after the recovery reaction.The recovered copper oxide nanosheets were used to oxidize phenol in the photo-assisted Fenton-like system.The effects of different catalyst amount,hydrogen peroxide concentration and pH on the degradation of phenol were investigated.The degradation rate was 100% under the optimized conditions for 30 minutes.The leached copper in the Fenton-like reaction is recovered again by the alkaline hydrogen peroxide system to ensure that the copper content in the effluent is less than 1 mg/L,reaching the discharge standard.The reaction mechanism of photo-assisted Fenton system was described by the method of free radical quenching and the volt-ampere characteristic curve of the catalyst.In addition,by using the surface plasma effect of copper sulfide,the applied light region of photo-assisted Fenton-like catalytic oxidation system was extended from visible light region to infrared light region.A light/copper sulfide/hydrogen peroxide Fenton-like system was constructed to degrade organic pollutants.The degradation rate of 50 ppm phenol and 20 ppm rhodamine B reached 100% in 30 minutes.The synthesized copper sulfide with visible and near-infrared light response can significantly enhance the degradation activity of model pollutants under visible and nearinfrared light conditions.EPR measurements showed that hydroxyl radicals and superoxide anions both were active species in the process of Fenton-like catalytic oxidation.XPS changes of copper before and after the reaction indicated that there was a conversion between monovalent copper and divalent copper.