Changes in the surfaces of adsorbed p-nitrophenol on methyltrioctadecylammonium bromide organoclay -an XRD, TG and infrared spectroscopic study

Frost, Ray L. and Zhou, Qin and He, Hongping and Xi, Yunfei (2007) Changes in the surfaces of adsorbed p-nitrophenol on methyltrioctadecylammonium bromide organoclay -an XRD, TG and infrared spectroscopic study . Journal of Colloid and Interface Science 314(2):pp. 405-414.

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Abstract

Water purification is of extreme importance worldwide. P-nitrophenol was used as a test chemical to design and test an organoclay for the removal of p-nitrophenol from an aqueous solution. Synthesis of the organoclay with methyltrioctadecylammonium bromide [CH3(CH2)17]3NBr(CH3) labeled as MTOAB results in multiple expansions of the montmorillonite clay from 1.24 nm to a maximum of 5.20 nm as is evidenced by the XRD patterns. Thermal analysis shows strong bonding of the surfactant to the clay siloxane layers and the interaction of the p-nitrophenol with the clay surfaces. It is proposed that the p-nitrophenol penetrates the siloxane layer of the clay and bonds through the ditrigonal space of the siloxane hexagonal units to the inner OH units. Such a concept is supported by the observation of an additional infrared bands at 3652 cm-1 for the organoclay. Shifts in the p-nitrophenol OH stretching vibrations mean a strong interaction of the p-nitrophenol molecule. Significant changes in the siloxane stretching bands are also observed.

Item Type:	Journal Article
Status:	Published
Keywords:	montmorillonite, organoclay, surfactant, differential thermal analysis, thermogravimetric analysis, X-ray diffraction, infrared spectroscopy
Subjects:	250000 Chemical Sciences > 250100 Physical Chemistry (incl. Structural) > 250105 Structural Chemistry 250000 Chemical Sciences > 250100 Physical Chemistry (incl. Structural) > 250104 Chemical Spectroscopy 250000 Chemical Sciences > 250100 Physical Chemistry (incl. Structural) > 250103 Colloid and Surface Chemistry
ID Code:	9164
Deposited By:	Frost, Ray
Deposited On:	27 August 2007
Alternative Locations:	http://dx.doi.org/10.1016/j.jcis.2007.06.011
Copyright Owner:	Copyright 2007 Elsevier
Copyright Statement:	Reproduced in accordance with the copyright policy of the publisher.
Additional Information:	The purification of water is extremely important. The application of organoclays for the removal of organic impurities of water is extremely likely.