Teguia Doumbi Romuald

Title : Preparation and characterization of Ti/SnO2-Sb-NSG electrode for optimization the direct oxidation of methyl orange dyes using box-benhken design

Abstract:

The degradation of methyl orange (MO) was studied by the direct electrooxidation using nitrogen and sulfur co-doped graphene (NSG) supported antimony doped tin oxide (Ti/SnO₂-Sb). The Sol gel and microwave technics were used to prepare the electrode material (Ti/SnO2-Sb-NSG). Raman, XRD, and FTIR spectroscopy analyses help to confirm the coating of titanium substrate with the SnO₂-Sb-NSG film. Linear sweet voltammetry results show that the Ti/SnO₂-Sb-NSG material possesses high oxygen overvoltage, which is an important characteristic of anodic materials for electrochemical direct oxidation. The effect of three independent variables including electrolysis time, current density and dye concentration on the performance of the anodic oxidation system was modeled using the Box-Behnken Design⁴. The optimum conditions for MO degradation were a current density of 18 mA/cm², an electrolysis time of 6 h and a dye concentration of 29 mg/L. However, based on these optimums, MO was degraded at 98.71 %.However, based on these optimums, MO was degraded at 98.71 %. Based on the intermediate compounds, the degradation mechanism of MO at the Ti/SnO2-Sb-NSG anode was proposed.
 Furthermore, the lifetime of Ti/SnO₂-Sb-NSG electrode was about 31.6 h while Ti/SnO₂-Sb electrode was 9.0 h. Based on the results, direct electrooxidation using Ti/SnO₂-Sb-NSG electrode could be a proper process for the treatment of textile wastewater.

Biography:

Dr. Romuald studied Chemistry at the University of Ngaoundere, Cameroon and graduated as MS in 2018. I then joined the research group of Prof. Noumi at the Department of Chemistry, Faculty of Science, University of Ngaoundere. I received her PhD degree in 2022 at the same institution. After I began to give some Inorganic courses in this department. I have published 6 research papers in SCI(E) journals.