Preparation Of Me/Go/Ti Electrode And Its Electrocatalytic Reduction Of Nitrate

With the rapid development of industry,the problem of water body like eutrophication becomes more and more serious because of the sharply increased nitrogen content in water.Therefore,nitrogen-containing wastewater treatment is urgent.At present,the concentration of total nitrogen caused by nitrate in effluent often exceeds the discharge standards by regular biochemical technology.In this paper,nitrate was selected as the target pollutant,and the Cu/GO/Ti,Ag/GO/Ti and Sn/Pd-GO/Ti were used as cathode to electrochemical nitrogen-containing wastewater,the influence factors such as current density,chloride ion concentration,pH,ammonia concentration were studied,and the plate was characterized by SEM,XRD,Raman,XPS.The results are obtained as follows:(1)The Me/GO/Ti electrodes were prepared by electrodeposition,the introduction of graphene oxide increased the electrochemical activity and stability of the electrode,and prolonged the service life of the electrode,reduced the secondary pollution caused by the metal.(2)Electrocatalytic reduction of nitrate by Cu/GO/Ti electrode which were prepared by stepwise electrodeposition,the nitrate could be decreased to about 5mg/L when the current density was 15mA/cm~2,p H was 7 and the chloride ion concentration was 500mg/L after 3h.The dissolution of Cu at the Cu/GO/Ti electrode was lower than Cu/Ti electrode,which reduced the secondary pollution caused by Cu.And the introduction of graphene oxide can not only increase the electrochemical activity of the electrode and improve the removal efficiency of nitrate,but also enhance the stability of the electrode,prolong the service life of the electrode.(3)Electrocatalytic reduction of nitrate by Ag/GO/Ti electrode which were prepared by One-step electrodeposition,the removal rate of nitrate is more than 80%,when the current density was 10mA/cm~2,pH was 7,the chloride ion concentration was 400mg/L,and ammonia nitrogen concentration was 80mg/L after 4h.(4)Electrocatalytic reduction of nitrate by Sn/Pd-GO/Ti electrode which were prepared by stepwise electrodeposition,the nitrate could be decreased from25 to 4mg/L when the current density was 20mA/cm~2,pH was 10 and the chloride ion concentration was 400mg/L,ammonia nitrogen concentration was50mg/L after 4h.In a word,the electrodes prepared in this paper have high stability,long service life,high electrocatalytic activity to nitrate and low cost.Therefore,the electrode has some research significance.