Electrochemical Oxidation of 4-Chlorophenol over a Lamellar Double Znal Hydroxides-Modified Carbon Paste Electrode

A study is presented on the electrochemical oxidation of 4 chlorophenol (4cp),  dissolved in water, using a bare carbon paste electrode, EPC, and another that was modified with lamellar double ZnAl hydroxides (EPC/ZnAl-LDH). The electro-oxidation was effected within the 3-11 pH interval. It was found through cyclic voltammetry that this process was irreversible, namely, there were no reduction peaks, and that depending on the nature of the electrode, the rate limiting steps were: adsorption (EPC) and diffusion (EPC/ZnAl-LDH). The energy required and the oxidation reaction rate depended on the pH and on the nature of the electrode, such that the greater rates were obtained when the EPC/ZnAl-LDH electrode and acid pHs were used.