Decolorization of Reactive Red 239 Via Heat Activated Persulfate
American Journal of Physical Chemistry
Volume 7, Issue 3, September 2018, Pages: 45-49
Received: Aug. 14, 2018; Accepted: Sep. 3, 2018; Published: Oct. 9, 2018
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Ozlem Esen Kartal, Department of Chemical Engineering, İnönü University, Malatya, Turkey
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Effluents of cotton dyeing process of textile industry is considered as extremely polluted due to presence of unfixed azo dyes and auxiliary chemicals. The complex aromatic structure and non-biodegradability nature of azo dyes involved new and efficient treatment technologies to eliminate intense color from textile wastewater. In recent years, in-situ chemical oxidation technology (ISCO) using persulfate (S2O82-) as an oxidant has appeared to be a promising method for removal of azo dyes. S2O82- can be activated by UV, heat or transition metals to generate sulfate radical (SO4-). In this study, decolorization of Reactive Red 239 (RR239) azo dye via heat activated S2O82- was explored. Experiments were conducted in a cylindrical batch reactor equipped with a water jacket. Effect of parameters such as temperature, pH and S2O82- concentration on decolorization of RR239 was investigated. The results show that decolorization efficiency was enhanced with increasing temperature from 45 to 55°C but further increase in temperature did not enhance decolorization. The pseudo first order rate constant values fit well Arrhenius equation, yielding an activation energy of 108.75 kJ mol-1 for decolorization of RR239. The highest decolorization efficiency was obtained at pH=3 under the tested pH range. As S2O82- concentration increased decolorization efficiency increased. 89.67% and 39.05% decolorization and aromatic degradation efficiencies were observed within 120 minutes of reaction time, respectively. These results show that heat activated S2O82- method was a feasible method for decolorization of RR239.
Heat Activated Persulfate, Sulfate Radical, Azo Dye, Decolorization
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Ozlem Esen Kartal, Decolorization of Reactive Red 239 Via Heat Activated Persulfate, American Journal of Physical Chemistry. Vol. 7, No. 3, 2018, pp. 45-49. doi: 10.11648/j.ajpc.20180703.11
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