期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 154, 期 1-3, 页码 1025-1032出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2007.11.009
关键词
adsorption; depollution; organoclay; surfactant; mechanism of adsorption
HDTMA(+)-pillared montmorillonites were obtained by pillaring different amounts of the surfactant hexadecyltrimethylammonium bromide (HDTMAB) into sodium montmorillonite (Na-Mt) in an aqueous solution. The optimum conditions and batch kinetics of sorption of p-nitrophenol from aqueous solutions are reported. The solution pH had a very important effect on the sorption of p-nitrophenol. The maximum p-nitrophenol absorption/adsorption occurs when solution pH (7.15-7.35) is approximately equal to the pK(a) (7.16) of the p-nitrophenol ion deprotonation reaction. X-ray diffraction analysis showed that surfactant cations had been pillared into the interlayer and the p-nitrophenol affected the arrangement of surfactant. With the increased concentration of surfactant cations, the arrangement of HDTMA(+) within the clay interlayer changes and the sorption of p-nitrophenol increases. HDTMA(+)-pillared montmorillonites are more effective than Na-Mt for the adsorption of p-nitrophenol from aqueous solutions. The Langmuir, Freundlich and dual-mode sorption were tested to fit the sorption isotherms. (c) 2007 Elsevier B.V. All rights reserved.
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