Effective degradation of azo dye from textile wastewater by electro-peroxone process

• Published in: Chemosphere (Oxford) 2022-02, Vol.289, p.133152-133152, Article 133152
• Main Authors: Koulini, G.V., Laiju, A.R., Ramesh, S.T., Gandhimathi, R., Nidheesh, P.V.
• Format: Article
• Language: English
• Subjects: Azo Compounds; C.I. reactive black 5; Coloring Agents; Decolorization; Electro-peroxone; Electrolysis; Textile Industry; Textile wastewater; Textiles; Waste Water; Water Pollutants, Chemical - analysis
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2021.133152

Color-producing chemicals emitted from many sources, such as textile or dye manufacturing industries, are a significant concern worldwide. The present study focuses on the electro-peroxone (EP) process for decolorizing a synthetic azo dye, C.I. Reactive Black 5 (RB5). Findings suggest that the EP process is more effective for dye degradation than ozonation and electrolysis. The EP process resulted in 100% decolorization after 60 min of contact time under optimum testing conditions such as pH 7, applied current 300 mA, and sulfate concentration 3.55 g L−1. Based on the findings of the primary investigation, EP treatment of real textile effluent was carried out and 2 h of EP treatment resulted in 99% decolorization and 74%total organic carbon (TOC) removal. As an outcome, the EP process can treat textile wastewater in a cost-effective and environmentally friendly manner. [Display omitted] •Electro-peroxone method causes more dye degradation compared to ozonation and electrolysis.•Hydroxyl and superoxide radicals induce dye degradation.•71% of TOC was removed from textile effluent in the first 40 min.•The EP technique of removing dyes from wastewater is more environmentally friendly.