Abstract
Wastewater runoff containing hazardous dyes must be treated properly before being discharged into the environment. Indigo carmine (IC), a kind of dye, has been recognized to be potentially toxic. In this work, mediated electrochemical oxidation (MEO) using cerium (Ce4+) mediator ions incorporated with an Ag+ catalyst ion was tested to treat IC solution in a reactor as a simulation. The experimental results demonstrated that the IC molecules can be degraded quickly in a relatively short time by MEO. It was clearly shown that the degradation performance of IC by MEO was affected by the Ce2(SO4)3 concentration, working potential, time, and catalyst ion concentration as well. In addition, the high percentage recovery of Ce4+ proves the reusability of Ce4+ as a mediator ion. As an outstanding result, the percentage degradation of IC using Ce4+ /Ag+ ions was remarkably higher than that without Ce4+ mediator ions (100% vs 2%). In summary, our work suggests that MEO using a combination of Ce4+ mediator and Ag+ catalyst ion has great potential to improve the wastewater quality
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