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DOI: https://doi.org/10.4491/eer.2018.232
Removal of toxic hydroquinone: Comparative studies on use of iron impregnated granular activated carbon as an adsorbent and catalyst
Ankit Tyagi1, Susmita Das1,2, and Vimal Chandra Srivastava1
1Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, Uttarakhand, India.
2Department of Chemical Engineering, National Institute of Technology Calicut, Kozhikode, Kerala 673 601, India
Corresponding Author: Vimal Chandra Srivastava ,Tel: +91-1332-285889, Fax: +91-1332-276535, Email: vimalcsr@yahoo.co.in
Received: July 11, 2018;  Accepted: November 10, 2018.
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In this study, iron (Fe) impregnated granular activated carbon (Fe-GAC) has been synthesized and characterized for various properties. Comparative studies have been performed for use of Fe-GAC as an adsorbent as well as a catalyst during catalytic oxidation of hydroquinone (HQ). In the batch adsorption study, effect of process parameter like initial HQ concentration (Co = 25-1,000 mg/L), pH (2-10), contact time (t: 0-24 h), temperature (T: 15-45°C) and adsorbent dose (w: 5-50 g/L) have been studied. Maximum HQ adsorption efficiency of 75% was obtained at optimum parametric condition of: pH = 4, w = 40 g/L and t = 14 h. Pseudo-second order model fitted the HQ adsorption kinetics whereas Langmuir model represented the isothermal equilibrium behavior. During oxidation studies, effect of various process parameters like initial HQ concentration (Co: 20-100 mg/L), pH (4-8), oxidant dose (CH2O2: 0.4-1.6 mL/L) and catalyst dose (m: 0.5-1.5 g/L) have been optimized using Taguchi experimental design matrix. Maximum HQ removal efficiency of 83.56% was obtained at optimum condition of Co = 100 mg/L, pH = 6, CH2O2 = 0.4 mL/L, and m = 1 g/L. Overall use of Fe-GAC during catalytic oxidation seems to be a better as compared to its use an adsorbent for treatment of HQ bearing wastewater.
Keywords: Adsorption | Catalytic oxidation | Granular activated carbon | Hydroquinone | Taguchi methodology
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