Adsorption of the herbicide 2,4-D on organo-palygorskite

Xi, Yunfei, Mallavarapu, Megharaj, & Naidu, Ravendra (2010) Adsorption of the herbicide 2,4-D on organo-palygorskite. Applied Clay Science, 49(3), pp. 255-261.

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Abstract

Among the clay minerals, montmorillonite is the most extensively studied material using as adsorbents, but palygorskite and its organically modified products have been least explored for their potential use in contaminated water remediation. In this study, an Australian palygorskite was modified with cationic surfactants octadecyl trimethylammonium bromide and dioctadecyl dimethylammonium bromide at different doses. A full structural characterization of prepared organo-palygorskite by X-ray diffraction, infrared spectroscopy, surface analysis and thermogravimetric analysis was performed. The morphological changes of palygorskite before and after modification were recorded using scanning electron microscopy, which showed the surfactant molecules can attach on the surface of rod-like crystals and thus can weaken the interactions between palygorskite single crystals. Real surfactants loadings on organo-palygorskites were also calculated based on thermogravimetric analysis. 1 CEC, 2 CEC octadecyl trimethylammonium bromide modified palygorskites, 1 CEC and 2 CEC dioctadecyl dimethylammonium bromide modified palygorskites absorbed as much as 12 mg/g, 42 mg/g, 9 mg/g and 25 mg/g of 2,4- dichlorophenoxyacetic acid respectively. This study has shown a potential on organo-palygorskites for organic herbicide adsorption especially anionic ones from waste water. In addition, equilibration time effects and the Langmuir and Freundlich models fitting were also investigated in details.

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ID Code: 75086
Item Type: Journal Article
Refereed: Yes
Keywords: palygorskite, octadecyl trimethylammonium bromide, dioctadecyl dimethylammonium bromide, 2,4- dichlorophenoxyacetic acid, adsorption, organoclay
DOI: 10.1016/j.clay.2010.05.015
ISSN: 0169-1317
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2010 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Applied Clay Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Clay Science, [VOL 49, ISSUE 3, (2010)] DOI: 10.1016/j.clay.2010.05.015
Deposited On: 18 Aug 2014 00:35
Last Modified: 19 Aug 2014 14:02

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