Decolorization of antraquinone dye Reactive Blue 181 solution by UV/H2O2 process

• Published in: Journal of photochemistry and photobiology. A, Chemistry. Vol. 299; pp. 67 - 72
• Main Authors: Basturk, Emine, Karatas, Mustafa
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.02.2015
• Subjects: Anthraquinone dye; Decolorization; Reactive Blue 181; UV/H2O2 process; Decolorization; Reactive Blue 181; Anthraquinone dye; UV/H2O2 process
• ISSN: 1010-6030; 1873-2666
• DOI: 10.1016/j.jphotochem.2014.11.003

The UV–vis spectra of RB181 during its decolorization of 20min. [Display omitted] •A high decolorization efficiency of 99% for RB181 was achieved after 20min treatment with UV/H2O2 process.•Decolorization of RB181 depends on pH, H2O2 dose and dye concentration.•The decolorization kinetic of RB181 followed pseudo-first-order reaction kinetic.•The decolorization of RB181 by UV/H2O2 and exposed that the oxidation process was exothermic under natural conditions. In this study, the decolorization of C.I. Reactive Blue 181 (RB181), anthraquinone dye, by UV/H2O2 processes was investigated. The effects of operating parameters, such as H2O2 dosage, pH value, dye concentration and temperature were examined. The optimum conditions were determined as [H2O2]=500mg/L, [RB181]=500mg/L and pH 3 for 20min reaction time. The decolorization was achieved by the UV/H2O2 process because of the production of some oxidizing agents as a result of UV irradiation. The decolorization kinetic of RB181 followed pseudo-first-order reaction kinetic. Thermodynamic analysis showed negative values of ΔH indicating exothermic under natural conditions.