Journal
DESALINATION
Volume 267, Issue 2-3, Pages 139-146Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.desal.2010.09.016
Keywords
Loosestrife activated carbon; Adsorption; Equilibrium isotherm; Kinetics; 2,4,6-Trichlorophenol
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Funding
- National Key Technology RAMP
- D Program for the Eleventh Five-year Plan [2006BAC10B03]
- Major National Science and Technology Project [2009ZX07210-009]
- Special Science Innovation Foundation of Shandong University [2009JQ009]
- National Natural Science Foundation [21007032]
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An activated carbon was prepared from the stalk of the scrap aquatic plant loosestrife, by H3PO4 activation and then was evaluated for its ability to adsorb 2,4,6-trichlorophenol (TCP). The effects of solution pH, agitation time, TCP initial concentration, and temperature on TCP adsorption were investigated. The equilibrium adsorption data of TCP on activated carbon were analyzed by Langmuir, Freundlich and Temkin isotherm models. The Temkin model gave the best correlation with the experimental data. The adsorption was found to follow the pseudo-second-order kinetics. The intraparticle diffusion model was used to determine the mechanism of the adsorption process. Thermodynamic parameters such as standard enthalpy (Delta H-o), standard entropy (Delta S-o), and standard free energy (Delta G(o)) were obtained. Adsorption of TCP is exothermic with Delta H-o at -12.87 kJ/mol. (c) 2010 Elsevier B.V. All rights reserved.
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