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Acta Phys. -Chim. Sin.  2005, Vol. 21 Issue (07): 808-812    DOI: 10.3866/PKU.WHXB20050722
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Adsorption of a Divalent Quaternary Ammonium Cation on Clay Mineral
LIN Bao-hui; GAO Mang-lai
State Key Laboratory of Heavy Oil Processing, Faculty of Chemical Engineering, University of Petroleum, Beijing 102249
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Abstract  Adsorption of a divalent quaternary ammonium named molecular deposition film flooding agent (MDFFA) on clay was studied. It is characterized by its surface non-activity. Two source clays were selected: montmorillonite (Su-M) and bentonite (B), and their cation exchange capacities (CEC) are 0.44 and 0.88 mmol•g-1 clay, respectively. At low ionic strength, all cations were completely adsorbed on the clay. Besides, the absorbed amounts of MDFFA on Su-M reach 100% of the CEC, while the absorbed amounts of MDFFA on B only reach 77% of the CEC. From FT-IR spectra, we deduced that the MDFFA only binds to the electronegative adsorption sites and does not bind to the external Si-OH groups which act as neutral adsorption sites. XRD data show that the basal spacings of the two kinds of clay decreased slightly with added amount of MDFFA. Based on the theoretical size of molecules, we think that only horizontal monolayer of MDFFA exists in clay interlayer.

Key wordsAdsorption      Molecular deposition filming flooding agent      Divalent quaternary ammonium complexes      Clay mineral     
Received: 24 November 2004      Published: 15 July 2005
Corresponding Authors: GAO Mang-lai     E-mail: gml@bjpeu.edu.cn
Cite this article:

LIN Bao-hui; GAO Mang-lai. Adsorption of a Divalent Quaternary Ammonium Cation on Clay Mineral. Acta Phys. -Chim. Sin., 2005, 21(07): 808-812.

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http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20050722     OR     http://www.whxb.pku.edu.cn/Y2005/V21/I07/808

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