Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 401, Issue -, Pages 125-132Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.03.020
Keywords
Ficus carica fiber; Microwave-activation; Cr(VI); Adsorption; Kinetics; Wastewater
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Ficus carica fiber based activated carbon (FCAC) was used as a potential adsorbent for Cr(VI) removal from aqueous system. The adsorbent was prepared by carbonization of F. carica fiber followed by H3PO4 activation under microwave radiations. The activated carbon was characterized using scanning electron microscopy and Fourier transformer infrared spectroscopy. The adsorption data were well studied for adsorption isotherms, kinetics models, and thermodynamics. Adsorption of chromium ion followed the second-order kinetics and best fitted the Langmuir adsorption isotherms. The maximum adsorption capacity of Cr(VI) onto FCAC was 44.84 mg/g. The calculated values of thermodynamic parameters like enthalpy change (Delta H degrees), entropy change (Delta S degrees), and free energy change (Delta G degrees) were found to be 7.85 kJ/mol, 69.17 J/mol K, and -13.11 kJ/mol, respectively. Adsorption process was spontaneous and endothermic in nature. (c) 2013 Elsevier Inc. All rights reserved.
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