Efficiency and Mechanism of Titanium Electrocoagulation for Simultaneous Removal of PO43-and Organophosphate
The free radicals and active chlorine species generated during the process of titanium electrocoagulation are capable of oxidizing and degrading organophosphate,and can attain the simultaneous and efficient removal of inorganic phosphate and organophosphate.Employing potassium dihydrogen phosphate(PO43-)and 2-aminoethyl phosphonic acid(AEP)as simulated pollutants of inorganic phosphate and organophosphate,the influences of plate spacing,current density,and initial pH on the removal of PO43-and AEP through titanium electrocoagulation were investigated.The free radical active species including hydroxyl radical(·OH)and chlorine free radical(Cl·)generated during the electrocoagulation were verified by quenching method,and the performance of titanium electrocoagulation for simultaneous removal of binary pollutants(PO43-and AEP)in both simulated and real water samples was explored.When the initial phosphate concentration(PO43-or AEP)was 1 mg/L,the optimal conditions for titanium electrocoagulation were plate spacing of 0.9 cm,current density of 10 A/m2,initial pH of 6～7,and running time of 1 h.Under these circumstances,the removal efficiencies of orthophosphate and AEP could reach 86.9％and 83.3％,respectively.The removal mechanism of phosphate mainly encompassed oxidative degradation,chelate adsorption,trapping and sweeping.
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