Kinetics of electrochemical oxidation of humic acid in alkaline medium
The kinetics of the electrochemical oxidation of humic acid under alkaline conditions is studied in a three-electrode H-type diaphragm electrolytic cell.Influences of temperature,anode potential and alkali concentration on the electrochemical oxidation are investigated.It is shown that the electrochemical oxidation process of humic acid accords with the second-order reaction kinetics model,and the activation energy is 19.94 kJ·mol-1.Different reaction conditions have different degrees of influence on the further oxidation of humic acid into high value-added coal acid.The oxidation process under different reaction conditions is analyzed,and it is found that temperature affects the intermolecular bond energy and double layer charge-discharge rate,anode potential affects the corresponding current density,then affects the electron transfer efficiency,and alkali concentration changes the conductivity of the solution.Molecular structure of humic acid changes after electrochemical oxidation,which can provide reference for further study of the complex coal electrochemical oxidation.
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