Kinetics of degradation of acid red 88 in the presence of Co2+-ion/peroxomonosulphate reagent

Visible light-assisted photo-Fenton-like oxidation of a mono-azo textile dye, acid red 88 (AR88), has been carried out in the presence of Co2+ as the catalyst and peroxomonosulphate (PMS) as the oxidant. Decolorization of AR88 in the Co2+/PMS system was observed to follow zero-order kinetics with respect to the dye. It was also found that the decolorization of AR88 increased as the concentration of cobalt ions was increased. The rate of abatement of the acid red 88 was found to be independent of the concentrations of dye and oxidant (PMS). Mineralization studies were also carried out by monitoring the reduction in total organic carbon (TOC) content during the course of the reaction and a suitable mechanism has been proposed.

Graphical abstractVisible light-assisted photo-Fenton-like oxidation of acid red 88 (AR88) has been studied in the presence of Co2+ and peroxomonosulphate. The extent of mineralization measured through TOC analysis showed that the Co2+/PMS reagent is very effective to achieve the mineralization of AR88 and would be suitable for applications in the field of environmental remediation.Figure optionsDownload full-size imageDownload as PowerPoint slide