Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 20, Issue 3, Pages 745-751Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2013.06.030
Keywords
Apricot stone; Cobalt; Heavy metal removal; Kinetic; Isotherm; Activated carbon
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The activated carbon from apricot stone with H3PO4 and its ability to remove Co2+ are reported. The FTIR spectroscopy brings insights on interactions between the functional groups of the carbon and Co2+. Adsorption studies are carried in batch mode by varying the initial Co2+ concentration and pH. A comparison of two kinetic models on the overall adsorption rate shows that the system is described by the pseudo-second-order kinetic model. The Freundlich model fits the data with a monolayer adsorption capacity of 111.11 mg/g at pH 9. The enthalpy and free energy indicate an endothermic and not spontaneous process. (C) 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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