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

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 (2007-08-04)
Qin Zhou, Ray L Frost, Hongping He, Yunfei Xi
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 [CH(3)(CH(2))(17)](3)NBr(CH(3)) 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 band 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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ammonium bromide, ≥99.99% trace metals basis
Sigma-Aldrich
Ammonium bromide, 99.999% trace metals basis
Sigma-Aldrich
Ammonium bromide, ACS reagent, ≥99.0%
Sigma-Aldrich
Ammonium bromide, AR, ≥99.5%