4.7 Article

Adsorption of o-, m- and p-nitrophenols onto organically modified bentonites

Journal

JOURNAL OF HAZARDOUS MATERIALS
Volume 185, Issue 2-3, Pages 1332-1339

Publisher

ELSEVIER
DOI: 10.1016/j.jhazmat.2010.10.050

Keywords

Adsorption; HDTMAB; PEG; Nitrophenols; Organobentonites

Funding

  1. Ankara University [BAP.2002.0745011]

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Experiments were conducted on the adsorption characteristics of o-, m- and p-nitrophenols by organically modified bentonites at different temperatures. Two organobentonites (HDTMA-B and PEG-B) were synthesized using hexadecyltrimethylammonium bromide (HDTMABr) and poly(ethylene glycol) butyl ether (PEG). Synthesized HDTMA-B and PEG-B were characterized by XRD, FTIR and DTA-TG analyses and their specific surface area, particle size and pore size distributions were determined. BET surface areas and basal spacings (d(001)) of the HDTMA-B and PEG-B were found to be 38.71 m(2) g(-1), 69.04 m(2) g(-1) and 21.96 angstrom, 15.17 angstrom, respectively. Increased adsorption with temperature indicates that the process is endothermic for o-nitrophenol. On the other hand m- and p-nitrophenols exhibited lower rates of adsorption at higher temperatures suggesting a regular exothermic process taking place. Results were analyzed according to the Langmuir, Freundlich and Dubinin-Redushkevich (D-R) isotherm equations using linearized correlation coefficient at different temperatures. R-L separation factors for Langmuir and the n values for Freundlich isotherms showed that m- and p-nitrophenols are favorably adsorbed by HDTMA-B and, p-nitrophenol is favored by PEG-B. Adsorption of o-, m- and p-nitrophenols as single components or from their binary mixtures on HDTMA-B and, p-nitrophenol on PEG-B are all defined to be physical in nature. (C) 2010 Elsevier B.V. All rights reserved.

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