Abstract
In this work, the oxidation of an azo dye (Acid Yellow 99) by H2O2 in aqueous solution with the Dawson-type heteropolyanion [H1.5Fe1.5P2W12Mo6O61, 22H2O] acting as a catalyst was studied. The effects of different parameters—the initial pH, the initial H2O2 concentration, the mass of the catalyst, and the initial dye concentration—on the oxidation of the dye were investigated. The optimal conditions that led to maximum decolorization were found to be: pH 3, catalyst mass = 0.05 g, and [H2O2]0 = 0.03 mM for an initial dye concentration of 30 mg L−1.
Highlights
The textile industry’s production of dyestuffs creates large volumes of waste water
The optimal conditions that led to maximum decolorization were found to be: pH 3, catalyst mass = 0.05 g, and [H2O2]0 = 0.03 mM for an initial dye concentration of 30 mg L-1
Acid Yellow 99 (AY99) is an anionic dye used in the paint, printing, and textile industries
Summary
The World Bank estimates that 17–20% of all industrial water pollution emanates from textile dyeing and treatment processes (Kant 2012). Acid Yellow 99 (AY99) is an anionic dye used in the paint, printing, and textile industries. It is appreciated for its color fastness and weather stability, and is used to dye nylon, wool, and silk (Elwakeel et al 2016). Among the methods applied to AY99 is decolorization, such as adsorption with coir pith. The development of inexpensive water remediation technologies has attracted considerable interest (Kant 2012). One such method may be the oxidation of organic textile dyes by hydrogen peroxide using polyoxometalates (POMs) as catalysts.
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