Decolorization of azo dye acid black 1 by the UV/H2O2 process and optimization of operating parameters.
An advanced oxidation process, UV/H2O2, 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 21.24 mmol/l and UV dosage of 1400 W/l in less than 1.2 min. 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/H2O2 reactor, 90% color removal was set as criteria to find the balance between both factors.
Shu
Hung-Yee
HY
Department of Environmental Engineering, Hungkuang University, No. 34 Chung-Chie Road, Shalu, Taichung County 433, Taiwan, ROC. hyshu@sunrise.hk.edu.tw
Chang
Ming-Chin
MC
Fan
Huan-Jung
HJ
D001391:Azo Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007220:Industrial Waste / Q000517:prevention & control*; D009994:Osmolar Concentration; D013783:Textile Industry / Q000295:instrumentation; D014466:Ultraviolet Rays
D001391:Azo Compounds; D004396:Coloring Agents; D007220:Industrial Waste; D006861:Hydrogen Peroxide