Preparation Of Fe@Cu Bimetallic Material And Its Degradation Of Organic Pollutant In Water

Organic pollutants in industrial wastewater are easily enriched,highly toxic,and difficult to degrade,which cause serious harm to the ecological environment.Research on the removal of organic pollutants is of great significance to ecological protection.The removal technology of bimetallic materials for organic pollutants has the advantages of simple operation process,high removal efficiency,thorough treatment,low cost,etc.,and has attracted widespread attention.This work takes metallic iron as the core and deposits transition metal copper on its surface to prepare Fe@Cu bimetallic materials.The physicochemical properties of bimetallic materials and the degradation performance of organic matter in typical industrial wastewater were studied.The effects of the dosage of bimetallic materials,the initial p H of the solution,the initial concentration of pollutants and other factors on the degradation of sodium diethyldithiocarbamate and 2,4-dichlorophenol by Fe@Cu bimetallic materials were mainly investigated,and in-depth discussion of the degradation mechanism of ethyl sulfur nitrogen and 2,4-dichlorophenol..The main experimental conclusions are as follows:(1)The study on the preparation process of Fe@Cu bimetallic materials showed that:Fe@Cu bimetallic materials were prepared by continuous reduction method using reduced iron powder and copper salt as raw materials.Studies have shown that when used for the degradation of sodium diethyldithiocarbamate pollutants,the optimal preparation process conditions of Fe@Cu bimetallic materials as follows:Cu Cl₂·2H₂O is the copper source,m(Fe)/m(Cu)=10:1;When degrading2,4-dichlorophenol,the optimal preparation process conditions of Fe@Cu bimetallic materials are:Cu Cl₂·2H₂O is the copper source and m(Fe)/m(Cu)=10:2.The microstructure characterization results of Fe@Cu bimetallic materials show that the surface copper morphology of the prepared Fe@Cu bimetallic materials is fine dendritic,and its surface area and pore volume are 7.6022 m²/g and 0.0120 cm³/g,respectively,which is conducive to the enrichment of electrons.(2)The optimization of Fe@Cu bimetallic material's degradation process and the study of degradation mechanism show that the optimal process conditions for Fe@Cu bimetallic material to degrade ethanesulfide are:dosage 200 g/L,Shaker speed220 rpm,the reaction time 30 min,the initial p H 7,and the initial concentration 200mg/L;at this time,the degradation rates of ethyl sulfide and Chemical Oxygen Demand(COD)were 97.13%and 95.13%respectively.Degradation mechanism studies have shown that the main mechanism for Fe@Cu bimetallic materials to degrade ethyl sulfide is the action of high-density electrons,and Cu can acelerate the corrosion of Fe⁰;Total Organic Carbon(TOC)test results show that sulfide nitrogen is mineralized during the degradation process.The final degradation products are CO₂,H₂O?NO₂^-?NO₃^-and SO₄^2-.(3)Fe@Cu bimetallic materials degrade 2,4-dichlorophenol process optimization and degradation mechanism research shows that the optimal process conditions for Fe@Cu bimetallic materials degrading 2,4-dichlorophenol as follows:the dosage 5 g/L,the initial p H=5,the Shaker speed 200 rpm,the reaction time 200min,and the initial concentration of 2,4-dichlorophenol 50 mg/L.At this time,the degradation rate of 2,4-dichlorophenol is 100%.Degradation mechanism studies have shown that the addition of free radical scavengers tert-butanol and p-benzoquinone has proved that the removal of 2,4-dichlorophenol is mainly due to the action of the highly active substance·OH,and the dissolved oxygen contributes to the formation of the active oxygen free radical(·O₂^-)?the hydroxyl radicals(·OH),and Cu can improve the corrosion of Fe⁰;the final degradation products of 2,4-dichlorophenol are CO₂and H₂O.The research of this experiment can provide a theoretical and technical reference for the removal of sodium diethyldithiocarbamate and 2,4-dichlorophenol in wastewater from industries such as metallurgy,chemical industry,printing and dyeing,papermaking and leather.