The Study Of The Preparation And Performances For The Multi Surface Hydroxyl Three-dimensional Particle Electrode

The reason why 3D particle electrode electrochemical catalytic oxidation technology can effectively remove organics is not only to increase the contact surface area with reactants and enhance direct oxidation but also to produce hydroxyl radical(· OH)in the reaction process,which plays an important role in the degradation of organic pollutants.This project investigates the performance of iron-carbon 3D particle electrodes prepared by bonding modified activated carbon with hydroxyl groups and iron copper alloy powder to synthesize 3D particle electrodes for the electrocatalytic degradation of organic pollutants in water using multiple surface hydroxyl groups.Firstly,to increase the surface hydroxyl groups of activated carbon,the paper carried out alkali modification,nitric acid modification,hydrogen peroxide modification,ozone modification,and acidic potassium permanganate modification on the activated carbon.The Boehm titration method was used to measure the changes in the surface hydroxyl and carboxyl groups of the modified activated carbon,and it was screened that potassium permanganate sulfuric acid had the best modification effect.Its surface hydroxyl groups increased by nearly 2.3times,reaching 0.9862 mmol/g,And obtain its suitable modification formula and preparation process.Secondly,characterization by BET,SEM,diffuse reflectance FT-IR,XRD,XPS,etc.demonstrated the increase in hydroxyl carboxyl content on the surface of modified activated carbon,as well as the increase in specific surface area and micropore volume,providing better performance raw materials for particle electrode preparation.Thirdly,by kneading the modified activated carbon-rich in hydroxyl groups with an iron copper alloy powder,the modified multi-surface hydroxyl activated carbon is uniform Ly mixed with iron powder(or iron copper alloy powder),clay(or fly ash),binder(water glass),and other additives in a certain proportion.Through extrusion,drying,microwave sintering,crushing,and screening,100 mesh modified iron carbon 3D particles(Fe Cu/g-AC)are finally prepared.In a self-made electrolytic cell,the electrocatalytic oxidation degradation performance of the prepared 3D particles for cyclohexanone-simulated wastewater was investigated.The results showed that the degradation rate of cyclohexanone by the Fe Cu/g-AC prepared by multi-surface hydroxyl modification was 10.176% higher than that of the unmodified 3D particles.Fourthly,the electrocatalytic oxidation degradation performance of a series of simulated wastewater,including cyclohexanone,phenol,chlorocyclohexane,butyl acetate,and n-butanol,was tested under equivalent conditions using modified 3D particles.The results showed that the modified 3D particles had good biodegradability for cyclohexanone,phenol,and butyl acetate,while their biodegradability for chlorocyclohexane and n-butanol was poor.Fifthly,electrocatalytic oxidation degradation experiments were conducted on polyester wastewater and landfill leachate from a certain factory using modified 3D particles under the same electrolysis conditions.The results showed that the TOC and ammonia nitrogen degradation rates of the actual wastewater could reach over 70%.In summary,the multi-surface hydroxyl modification of activated carbon can effectively improve the electrocatalytic oxidation performance of 3D particle electrodes and can be applied to the electrocatalytic degradation and purification process of various organic wastewater.