Journal
APPLIED CLAY SCIENCE
Volume 101, Issue -, Pages 327-334Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2014.08.023
Keywords
Inorganic-organic montmorillonites; Al-13 cation; Cationic surfactant; Zwitterionic surfactant; Structure
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB05050200]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2013BAC01B02]
- Team Project of Natural Science Foundation of Guangdong Province, China [S2013030014241]
- National Natural Science Foundation of China [41272060, 41102022, 21177104]
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A series of inorganic-organic montmorillonites (IOMts) were synthesized by modifying polyhydroxy-aluminum (Al-13)-pillared montmorillonites (AlPMts) with the cationic surfactant, hexadecyltrimethyl ammonium bromide (C16), and the zwitterionic surfactant, hexadecyldimethyl(3-sulphonatopropyl)ammonium (Z16). The products prepared using different surfactant concentrations (0.4-5.0 CEC) were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), and C, H, and N elemental analyses. The results showed that the structure of the IOMt was strongly influenced by surfactant type. In the case of C16-modified AlPMts (C-AlPMt), the surfactant molecules entered and expanded the interlayer space, leading to the partial release of pre-intercalated Al-13 cations. At high surfactant concentrations (>2.0 CEC), the basal spacing of C-AlPMts showed no further expansion although the gauche/trans conformer ratio of the intercalated surfactant decreased. In the case of Z16-modified AlPMt (Z-AlPMt), however, the amount of Z16 intercalated did not increase when the surfactant concentration exceeded 1.0 CEC, while the basal spacing was identical with that measured for the unmodified AlPMts This observation could be attributed to a difference in the capacity of AlPMt for intercalating C16 and Z16. It was proposed that C16 was intercalated through both cation exchange (with Al-13) and physisorption, while the intercalation of Z16 was primarily mediated by electrostatic attraction between the interlayer Al-13 cation in AlPMts and the negatively charged group of Z16. (C) 2014 Elsevier B.V. All rights reserved.
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