Decolorization of azo dye acid black 1 by the UV/H"2O"2 process and optimization of operating parameters [An article from: Journal of Hazardous Materials]

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Description:
An advanced oxidation process, UV/H"2O"2, was applied for decolorization of a di-azo dye (acid black 1). The effects of operating parameters such as hydrogen peroxide dosage, UV dosage and initial dye concentration, on decolorization have been evaluated. The acid black 1 solution was completely decolorized under optimal hydrogen peroxide dosage of 21.24mmol/l and UV dosage of 1400W/l in less than 1.2min. The decolorization rate followed pseudo-first order kinetics with respect to the dye concentration. The rate increased linearly with volumetric UV dosage and nonlinearly with increasing initial hydrogen peroxide concentration. It has been found that the degradation rate increased until an optimum of hydrogen peroxide dosage, beyond which the reagent exerted an inhibitory effect. For real case application, an operation parameter plot of rate constant was developed. To evaluate the electric power and hydrogen peroxide consumption by UV/H"2O"2 reactor, 90% color removal was set as criteria to find the balance between both factors.