Journal of Thermal Analysis and Calorimetry

, Volume 115, Issue 1, pp 219–225 | Cite as

Investigation of structure and thermal stability of surfactant-modified Al-pillared montmorillonite

  • Lingya Ma
  • Qing Zhou
  • Tian Li
  • Qi Tao
  • Jianxi Zhu
  • Peng Yuan
  • Runliang Zhu
  • Hongping He


For combining the properties of organoclays and pillared clays, inorganic–organic clays have attracted much attention in recent years. In this study, Al Keggin cation pillared montmorillonites (Al-Mts) were first prepared and parts of Al-Mts were calcined at different temperatures (C-Al-Mts). The inorganic–organic montmorillonites were synthesized by intercalating Al-Mts and C-Al-Mts with the cationic surfactant, hexadecyltrimethyl ammonium bromide (HDTMAB). The products were characterized by X-ray diffraction, X-ray fluorescence, and simultaneous thermogravimetric analysis. For HDTMAB-modified uncalcined Al Keggin cation pillared montmorillonites (H-Al-Mts), the basal spacing increased with the increment of surfactant loading level, but the Al content of H-Al-Mts decreased simultaneously, indicating that the intercalated surfactant replaced some Al Keggin cations in the interlayer space. However, in the case of C-Al-Mts, the interlayer spaces could not be further expanded after surfactant modification, implying that the neighboring montmorillonite layers were “locked” by the aluminum pillars which were formed by dehydroxylation of Al Keggin cation pillars during thermal treatment. The thermal stability of HDTMAB-modified C-Al-Mts (H-C-Al-Mts) was much better than that of H-Al-Mts. The major mass loss of H-C-Al-Mts occurred at ca. 410 °C, corresponding to decomposition of intercalated surfactant cations. In contrast, H-Al-Mts displayed two mass loss temperatures at ca. 270 and 410 °C, corresponding to the evaporation of surfactant molecules and the decomposition of surfactant cations in the interlayer space, respectively.


Montmorillonite Al-pillared montmorillonite Surfactant modification Microstructure Thermal stability 



We gratefully acknowledge financial support from the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX2-EW-QN101), the “Strategic Priority Research Program” of the Chinese Academy of Sciences (Grant No. XDB05050200), and the National Natural Science Foundation of China (Grant No. U0933003, 41272060). This is contribution No. IS-1657 from GIGCAS.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2013

Authors and Affiliations

  • Lingya Ma
    • 1
    • 2
  • Qing Zhou
    • 1
    • 2
  • Tian Li
    • 1
    • 2
  • Qi Tao
    • 1
  • Jianxi Zhu
    • 1
  • Peng Yuan
    • 1
  • Runliang Zhu
    • 1
  • Hongping He
    • 1
  1. 1.Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of GeochemistryChinese Academy of ScienceGuangzhouChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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