Study On Treatment Of Refractory Organics In Water By Advanced Oxidation Process

Our country is relatively few average per capita water resources and water pollution condition is relatively serious,water conservation and water pollution control should be carried out at the same time.Given the common biological method is unable to process printing and dyeing industry wastewater,it is necessary to use advanced oxidation technology to deal with the refractory organics,in order to achieve the purpose of harmless handling.Advanced electrochemical oxidation process has advantages like no additional chemical reagent and steerable oxidation process;the main principle is strong oxidant hydroxyl radical(OH)produced by water molecules on the surface of the electrode during the discharge,for the oxidation of refractory organic pollutants.In this paper,firstly,bromocresol green(BG),a dye with stable chemical properties,was the representative of the typical refractory organic compounds.The results showed that BG could be degraded by chemical Fenton reagent and exhibited pseudo-first order kinetic reaction.Secondly,the different substrate PbO2 electrode and the cathode materials of electrochemical generation rate of OH were explored.Under the condition of 35 ℃,the current density of 10 mA cm-2,the neutral medium BG,had got the decoloriazation rate more than 80%within 60 min.Finally,in order to further improve the electrochemical performance of PbO2 electrode,the Ga2O3 doping PbO2 electrode(Ga2O3-PbO2 electrode)was prepared.Compared with undoped PbO2 electrode,Ga2O3-PbO2 electrode had a higher oxygen evolution potential and smaller electrode surface impedance,is conductive to electrocatalytic generation OH.The kinetic study on the electrochemical degradation of BG showed that the reaction rate constant of Ga2O3-PbO2 electrode was about 2 times as that of PbO2 electrode.