Preparation Of Graphene Oxide Electrode And Research On Its Treatment Of Saline Organic Wastewater

In recent years,the research and optimization of the treatment technology of saline organic wastewater is still the focus of organic wastewater treatment.Among them,the electrocatalytic oxidation method has become one of the better choices for organic wastewater treatment due to its advantages of high treatment efficiency and simple operation.In order to find a new electrode material suitable for the treatment of saline organic wastewater,this study explored the combination of graphene oxide with excellent conductivity and selective cation exchange membrane to prepare graphene oxide electrode and study its use as electrode material possibility and treatment of simulated salt-containing phenol organic wastewater to explore the possibility of desalination.In this paper,the improved Hummers method was first used to prepare graphene oxide with good electrical conductivity,adsorption and oxidation properties,and it was combined with cation exchange membranes with different pretreatment methods to prepare graphene oxide electrodes.X-ray diffractometer,scanning electron microscope and other instruments were used to analyze the physicochemical properties of graphene oxide electrode,such as crystal structure,surface morphology,element type,etc.;its electrochemical performance was characterized by electrochemical impedance spectroscopy,cyclic voltammetry,etc.Simulated degradation experiments of saline organic wastewater explored the performance of graphene oxide electrode to degrade phenol.Based on this,the main research results of this paper are as follows:?1?The XRD and XPS images of the graphene oxide electrode indicate that the surface of the electrode is attached with active graphene oxide.The SEM image shows that the surface and the graphene oxide have a similar structure,with an irregularly folded and wrinkled structure,translucent,and a sheet.The interlayer spacing is wide,with a large surface area and rich oxygen-containing functional groups,and has certain oxidation and adsorption capabilities.The cyclic voltammetry curve,polarization curve and electrochemical impedance spectroscopy of graphene oxide and graphene oxide electrodes all show that the combination of graphene oxide and cation exchange membrane improves the electrocatalytic performance of graphene oxide and the electrode reaction.The electrode is stable,promotes the oxidation reaction on the electrode surface,improves the adsorption performance of the electrode surface,improves the capacitance value of the electrode,and the electrochemical performance is better than graphene oxide.Among them,the hydrophilic graphene oxide electrode has the best electrochemical performance,which is consistent with the analysis results of physical and chemical analysis test methods.?2?The prepared graphene oxide electrode was treated to simulate saline organic wastewater.The experimental results confirmed that the cationic membrane graphene oxide electrode had the lowest system energy consumption(E_sp)and the highest current efficiency?ACE?,which were 235.81 k Wh/kg COD and 12.66%,the hydrophilic graphene oxide electrode is second only to it,which is 269.39 k Wh/kg COD and11.08%,the performance of the sodium chloride graphene oxide electrode is the worst,344.83 k Wh/kg COD and 8.66%.The yield(Y_st)is consistent with its COD degradation trend.The hydrophilic graphene oxide electrode is superior to the cationic membrane graphene oxide electrode.The Y_stof the three electrodes are 0.4083 mg/L?min,0.3817mg/L?min,and 0.29 mg/L?min,respectively.Indicating that the electrocatalytic activity and electrical conductivity of the cationic graphene oxide electrode is higher than that of the hydrophilic graphene oxide electrode,and the hydrophilic graphene oxide electrode has the best ability to remove organic matter.?3?In order to explore the performance of graphene oxide electrode desalination and degradation of organic matter,verify that it can achieve simultaneous desalination and degradation of organic matter,and explore its influencing factors,the establishment of organic concentration prediction model and desalination theoretical model.The experimental results of the electrocatalytic oxidation of graphene oxide electrode to simulate saline wastewater prove that it can simultaneously desalinate and degrade organic matter;the theoretical value of the organic matter concentration prediction model is compared with the actual value,and it is found that the prediction model derived from the effective current density is more in line with the experiment.As a result,it is analyzed that the performance of the electrode for degrading organic matter is affected by the conductivity.Increasing the conductivity of the electrode can improve its ability to degrade organic matter.Compare the theoretical desalination value calculated by the theoretical model of desalination with the actual desalination value obtained by experiment.It can be seen that graphene oxide electrodes store sodium ions and graphene oxide adsorbed salts to achieve the purpose of desalination by virtue of the capacitance characteristics of the electrodes.The desalting capacity is not only related to electrical conductivity,but also to its own adsorption capacity.Therefore,improving the conductivity and adsorption capacity of the electrode can make the electrode desalinate.The ability to degrade organic matter is further improved.The paper has 20 pictures,14 tables,and 99 references.