title: Advanced oxidation of Reactive Blue 181 solution: a comparison between Fenton and Sono-Fenton process.
abstract: In this work, the decolorization of C.I. Reactive Blue 181 (RB181), an anthraquinone dye, by Ultrasound and Fe(2+) H2O2 processes was investigated. The effects of operating parameters, such as Fe(2+) dosage, H2O2 dosage, pH value, reaction time and temperature were examined. Process optimisation [pH, ferrous ion (Fe(2+)), hydrogen peroxide (H2O2), and reaction time], kinetic studies and their comparison were carried out for both of the processes. The Sono-Fenton process was performed by indirect sonication in an ultrasonic water bath, which was operated at a fixed 35-kHz frequency. The optimum conditions were determined as [Fe(2+)]=30 mg/L, [H2O2]=50 mg/L and pH=3 for the Fenton process and [Fe(2+)]=10 mg/L, [H2O2]=40 mg/L and pH=3 for the Sono-Fenton process. The colour removals were 88% and 93.5% by the Fenton and Sono-Fenton processes, respectively. The highest decolorization was achieved by the Sono-Fenton process because of the production of some oxidising agents as a result of sonication. The paper also discussed kinetic parameters. The decolorization kinetic of RB181 followed pseudo-second-order reaction (Fenton study) and Behnajady kinetics (Sono-Fenton study).
authors.affiliation: Aksaray University, Engineering Faculty, Department of Environmental Engineering, 68100 Aksaray, Turkey. Electronic address: eminebasturk@hotmail.com.
authors.forename: Emine
authors.initials: E
authors.lastname: Basturk
authors.affiliation: Aksaray University, Engineering Faculty, Department of Environmental Engineering, 68100 Aksaray, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Karatas
keywords: Anthraquinone dye; Decolorization; Reactive Blue 181; Sonication; Sono-Fenton process