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Submitted: 07 Sep 2021
Revision: 11 Nov 2021
Accepted: 21 Dec 2021
ePublished: 29 Dec 2021
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Avicenna J Environ Health Eng. 2021;8: 116-125.
doi: 10.34172/ajehe.2021.15
  Abstract View: 149
  PDF Download: 90

Original Article

Electrochemical Degradation of Synthetic Textile Wastewater by C/MnO2 Electrode Assessed by Surface Response Methodology

Romuald Teguia Doumbi 1* ORCID logo, Guy Bertrand Noumi 1, Tinda Domga 2 ORCID logo

1 Department of Chemistry, Faculty of Science, University of Ngaoundere, PO Box 454, Ngaoundere, Cameroon
2 Department of Applied Chemistry, National School of Agro-Industrial Sciences, University of Ngaoundere, PO Box 455 Ngaoundere, Cameroon
*Corresponding Author: *Correspondence to Romuald Teguia Doumbi, Tel: +237 695115105, Fax: (237) 225 17 47, PO Box 454, Ngaoundere, Cameroon. Email: , Email: teguiaromuald@yahoo. com

Abstract

The current work investigated the optimization of synthetic textile wastewater (STW) containing methyl orange, crystal violet, and neutral red reactive dye degradation on manganese dioxide coated on graphite electrode using the Box-Behnken design (BBD). Carbon coated by manganese oxide (C/ MnO2 ) electrode was prepared by the sol-gel method. Graphite substrates were obtained from spent lithium-ion batteries for recycling and reducing the price of the electrode material in electrochemical processes. C/MnO2 was used as anode and cathode in an electrochemical cell during experiments. In addition, BBD was applied to design the experiments and find the optimal conditions for the degradation of STW. From the proposed model, the rate of the removal efficiency of chemical oxygen demand (COD) reached 83.63% with the optimum conditions (6.989 hours, concentration of 1.5 g/L NaCl, and current density of 50 mA/cm2 ). Based on the obtained optimum values, the specific energy consumption was around 30.359 kWh (kg COD)-1. Furthermore, the C/MnO2 electrode was characterized by Raman spectroscopy, and MnO2 films were prepared from the sol-gel process and deposited on graphite. Thus, using graphite coated with manganese dioxide, indirect anodic oxidation (IAO) can be efficient for the removal of the organic matter from the real textile dye bath.
Keywords: Box-Behnken design, C/MnO2 electrode, Indirect anodic oxidation, Sol-gel, Synthetic textile wastewater,


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