Synthesıs of Activated Carbon Supported Catalysis Systems and Research for Electrocatalytıc Performance on Wastewater Treatment

Articles in Press

Document Type : Research Article

Authors

Department of Chemistry. Faculty of Science. Muğla sıtkı Koçman University 48000 MUĞLA . TURKEY

Abstract

Electrochemical treatment is based on the direct anodic oxidation method in which the pollutants are adsorbed on the anode surface and then reduced by the electron transport reaction. In this study, the effect of different catalysts on the treatment of olive wastewater is carried out by using electrocatalytic methods. Initially, TiO2/AC, V2O5/TiO2/AC, WO3/TiO2/AC and V2O5/WO3/TiO2/AC catalysts were prepared by a sol–gel method. Then, the removal of different pollutants such as colour, phenol, lignin, and Chemical Oxygen Demand (COD) was investigated by using different experimental electrochemical processes. In the electrocatalytic oxidation process, synthesized catalytic materials were used as particle electrodes (working electrodes) with the graphite electrodes in an electrochemical cell. The treatment process was optimised by investigating the effects of different parameters, for example, treatment time, catalyst type, catalyst amount (as solid/liquid ratio), voltage, the amount of supporting electrolyte (NaCl) and suspension’s pH. The V2O5/TiO2/AC catalyst exhibited the highest percentage removal under all experimental conditions, with a significant effect of voltage on the removal capacity observed (82.95% for lignin and 74.42% for COD). While the pH effect showed limited influence on the removal performance, higher yields were observed in acidic conditions. The electrocatalytic reaction involved various steps such as adsorption, nonadsorption, electrooxidation, and electrocatalytic oxidation. The individual effects of these steps were also investigated, resulting in percentage color removals of 25.58%, 51.72%, and 72.42%, respectively. When the data were evaluated in terms of kinetics, it was seen that the data provide a first-degree agreement of over 90 % in all experimental parameters and the removal rate constants of low molecular weight substances may generally be higher than the others. Despite its significant lignin removal efficiency, the catalytic process mentioned above yielded lower values compared to other catalytic methods.

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Iranian Journal of Chemistry and Chemical Engineering

Articles in Press, Accepted Manuscript
Available Online from 15 August 2023

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