Structural characterisation and environmental application of organoclays for the removal of phenolic compounds

Park, Yuri, Ayoko, Godwin A., Horvath, Erzsebet, Kurdi, Róbert, Kristof, Janos, & Frost, Ray L. (2013) Structural characterisation and environmental application of organoclays for the removal of phenolic compounds. Journal of Colloid and Interface Science, 393, pp. 319-334.

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Abstract

Modified montmorillonite was prepared at different surfactant (HDTMA) loadings through ion exchange. The conformational arrangement of the loaded surfactants within the interlayer space of MMT was obtained by computational modelling. The conformational change of surfactant molecules enhance the visual understanding of the results obtained from characterization methods such as XRD and surface analysis of the organoclays. Batch experiments were carried out for the adsorption of p-chlorophenol (PCP) and different conditions (pH and temperature) were used in order to determine the optimum sorption. For comparison purpose, the experiments were repeated under the same conditions for p-nitrophenol (PNP).

Langmuir and Freundlich equations were applied to the adsorption isotherm of PCP and PNP. The Freundlich isotherm model was found to be the best fit for both of the phenolic compounds. This involved multilayer adsorptions in the adsorption process. In particular, the binding affinity value of PNP was higher than that of PCP and this is attributable to their hydrophobicities. The adsorption of the phenolic compounds by organoclays intercalated with highly loaded surfactants was markedly improved possibly due to the fact that the intercalated surfactant molecules within the interlayer space contribute to the partition phases, which result in greater adsorption of the organic pollutants.

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ID Code: 58775
Item Type: Journal Article
Refereed: Yes
Keywords: Isotherms, PCP, Adsorption, Application, Molecular mechanical modelling
DOI: 10.1016/j.jcis.2012.10.067
ISSN: 1095-7103
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Elsevier Inc.
Deposited On: 10 Apr 2013 04:04
Last Modified: 29 Apr 2013 21:23

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