Mediated Electrochemical Oxidation of Glucose as Simulation of Tofu’s Wastewater Using Kobalt(III) in Nitric Acid Solution as Mediator

• Main Author: Luthfi Hawari, Diar
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/32270
• Institution: Institut Teknologi Bandung

Mediated Electrochemical Oxidation (MEO) is an electrochemical method of oxidation using a mediator species as an oxidising agent. MEO is one promising method to oxidize organic compounds because the redox reaction can be carried out at ambient temperature and pressure, and the secondary products of oxidation can be minimized. Cobalt(III) ion in water is an unstable species and strong oxidant. Tofu wastewater containing carbohydrate as it major composite, the composition is 50%. This study uses glucose as a sample of simulated tofu wastewater. Cobalt(III) solution has been successfully oxidize glucose sample into carbon dioxide. Preparation of cobalt(III) conducted by electrolysis of cobalt(II) nitrate solution using the optimized parameters. The optimization of cobalt(III) yield depends on the concentration of cobalt(II) ions, the potential, the concentration of nitric acid and electrolysis time, and the effect of silver nitrate on the catholyte, produce optimal conditions on the concentration of ions of cobalt(II) of 0.10 M, the potential 6 V, the concentration of nitric acid 4 M, at 75 minutes by not adding 0.1 M silver(I) nitrate in the catholyte and performed with stirring. At the optimum conditions, the solution is used to oxidize the 0.01 M glucose sample in batch process. The process is yielding 0.344 mmol carbon dioxide, or yield percent of carbon dioxide conversion is 19.12%.