Mechanism of p-nitrophenol adsorption from aqueous solution by HDTMA+-pillared montmorillonite -: Implications for water purification

JOURNAL OF HAZARDOUS MATERIALS

卷:154

Article

Zhou, Qin^1,2,3  He, Hong Ping^1,2  Zhu, Jian Xi²  Shen, Wei^2,3  Frost, Ray L.¹  Yuan, Peng² 

[1] Queensland Univ Technol, Sch Phys & Chem Sci, Inorgan Mat Res Program, Brisbane, Qld 4001, Australia

[2] Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China

[3] Grad Univ Chinese Acad Sci, Beijing 100039, Peoples R China

关键词: adsorption;    depollution;    organoclay;    surfactant;    mechanism of adsorption;   

DOI  :  10.1016/j.jhazmat.2007.11.009

来源: Elsevier

【 摘 要 】

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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