Research On The Application Of Graphene Electrode In Electrochemical Removal Pb(?)from Wastewater

With the rapid development of lead-acid battery,secondary lead industry and lead smelters,more and more lead-containing wastewaters are generated.If don't dispose lead pollutants of these wastewater,discharge them to water environment,which will bring about serious wastewater pollutions and damages to people's health conditions.Electrochemical treatment as a traditional wastewater treatment,it possesses many advantages that contain a high removal efficiency,without secondary pollutions and without employment of amounts of reagents.In this paper,firstly,we research the process of electrochemically reduced graphene oxide to stainless steel net and nickel foam.Secondly,prepared reduced graphene oxide @ stainless steel net?RGO@SSN?electrode and applied it to electrochemically remove Pb²⁺ from the aqueous solution,which is a promising electrode that can exhibit substantial apparent current densities and higher removal speed.Compared with the SSN treatment,the high Pb?II?removal efficiency 97.2% of Pb?II?solution(1000 mg L^-1)was reached through electrochemical treatment with RGO@SSN for 200 min which is promoted by 12.0%.The removal reaction is corresponded with first-order kinetics.The removal rate of RGO@SSN is 4.45 times higher than that of SSN.Finally,we investigate the electrode's property of being reused.The polarization resistance is promoted by 55.3% and 89.5% in 0.1 M NaCl and 0.1 M HCl solution,respectively,indicating stronger protection against corrosion.Furthermore,the RGO@SSN electrode can be efficiently regenerated in dilute HNO₃ solution.According to the researched conclusions,it is different that the electrochemical reduced process of graphene oxide on stainless steel net and nickel foam.The RGO@SSN electrode present excellent performance in electrochemical removal Pb?II?from the aqueous solution.These results will profoundly provide guiding significance for electrochemically reduce graphene oxide and the electrochemical treatment heavy metal wastewater.