Changes in the surfaces of adsorbed para-nitrophenol on HDTMA organoclay--the XRD and TG study

Qin Zhou; Ray L Frost; Hongping He; Yunfei Xi

doi:10.1016/j.jcis.2006.11.016

Changes in the surfaces of adsorbed para-nitrophenol on HDTMA organoclay--the XRD and TG study

J Colloid Interface Sci. 2007 Mar 1;307(1):50-5. doi: 10.1016/j.jcis.2006.11.016. Epub 2006 Nov 15.

Authors

Qin Zhou¹, Ray L Frost, Hongping He, Yunfei Xi

Affiliation

¹ Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.

PMID: 17161414
DOI: 10.1016/j.jcis.2006.11.016

Abstract

Surfactant modified montmorillonitic clays synthesized by ion exchange using the hydrothermal reaction method have been compared using XRD and thermal analysis. X-ray diffraction (XRD) shows the changes in the surface properties of organoclays through expansion with surfactant loading. A polynomial relationship exists between the basal spacing and the CEC loading described by the equation y=0.3232x(2) + 0.2052x+1.2834 with R(2)=0.9955. Different arrangements of the surfactant molecules in the organoclays are inferred from the changes in basal spacings. para-Nitrophenol also causes the expansion of the montmorillonite clay and affects the arrangements of the surfactant molecules within the clay layers. Changes in the surfactant molecular arrangements were analyzed by thermogravimetry. Additional thermal decomposition steps were observed when para-nitrophenol is adsorbed on the organoclay.