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Chemical oxidation of C. I. Reactive Red 2 using Fenton-like reactions

2002; Royal Society of Chemistry; Volume: 4; Issue: 5 Linguagem: Inglês

10.1039/b205844h

1464-0333

Kabita Dutta, Surajit Bhattacharjee, Basab Chaudhuri, Subrata Mukhopadhyay,

TiO2 Photocatalysis and Solar Cells

A detailed investigation on the kinetics of the oxidative degradation of a reactive dye, C. I. Reactive Red 2 by hydroxyl radicals generated by H2O2 and Fe2+ has been carried out in aqueous acidic media. Effects of different parameters like initial concentration of dye, H2O2, Fe2+, pH of the solution, reaction temperature and added electrolytes on the oxidation process have been studied. The results indicate that 1.63 × 10−4 mol dm−3 dye can be most effectively degraded at a dye∶Fe2+∶H2O2 molar ratio of 1∶0.22∶8.13 at pH ∼ 2.7 and at 299 K. The addition of excess 2-propanol or t-butyl alcohol, well known scavengers of hydroxyl radicals, almost stopped the degradation of the dye indicating the absence of any possible reductive pathways in the degradation. The results may be useful for designing the treatment systems of wastewater containing various reactive dyes.