Study On Electrochemical Reduction Of Triiodomethane Based On Enhanced Adsorption Of Copper Modified Electrode

At the beginning of the 20th century,people began to use chlorination disinfection to remove microbial bacteria in drinking water.With the continuous development of technology and society,chlorination technology has been widely used in various countries around the world.However,in the process of chlorinating disinfection of drinking water,a series of carcinogenic and mutagenic substances,namely disinfection by-products(DBPs),are produced.Among them,iodohalomethane is the most toxic and the most content,and therefore it is more and more widely People's attention.In recent years,electrochemical reduction of halogenated organic compounds has attracted the attention of researchers due to its high dehalogenation efficiency,easy operation and no secondary environmental pollution.In this dissertation,electrode materials with different micro-surface structures,such as conductive glass(FTO)and activated carbon fiber(ACF),were selected as electrode-supported copper catalysts for electrochemical reduction degradation of typical hard-to-degrade disinfection by-products in water.Triiodomethane(TIM)as an example.The main work has been carried out in the following areas:First,conductive glass(FTO)electrodes and activated carbon fiber electrodes(ACF)were obtained through pretreatment.Copper modified conductive glass click(Cu/FTO)and copper modified activated carbon fiber electrodes(Cu/ACF)were prepared by electrochemical deposition The adsorption performance of TIM,a typical refractory pollutant in water,was studied through the above-mentioned several new electrodes.In the electrochemical adsorption experiments,the effects of different electrode materials on the TIM adsorption efficiency and the TIM adsorption efficiency after different voltages were applied to the working electrode surface were studiedSecondly,an electrochemical reduction degradation method was added on the basis of the electrochemical adsorption experiment,and the electrochemical reduction degradation reaction was enhanced by utilizing the adsorption performance.The electrochemical reduction reaction enhanced by TIM adsorption was studied on Cu/ACF.Through experiments,when the voltage is-0.2 V to-1.0 V,it is concluded that the electrochemical removal of TIM by the Cu/ACF electrode is mainly due to the inherent adsorption performance of ACF;when the voltage is-1.0 V to-1.5 V,the Cu/ACF electrode The ACF electrode's electrochemical reduction efficiency of TIM has been increasing and maximized;when the voltage is increased from-1.5 V to-1.8 V,Cu/ACF has little effect on the reduction efficiency of TIM.In addition,due to the catalytic ability of Cu nanoparticles,the reduction efficiency changes with the loading of Cu nanoparticles.As the copper loading increased from 0.02 to 0.54 mg/cm2,the reduction rate constant k first increased from 0.39 to 1.78 h-1.However,as the copper loading further increased to 0.81 mg/cm2,the constant k then decreased to 1.39 h-1.Therefore,Cu nanoparticles play an important role in the electrochemical reduction of TIM.