Pyrolysis and its mechanism of organomontmorillonite (OMMT) influenced by different functional groups
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In this study, three types of long-chain surfactants including 12-aminododecanoic acid (ADA), hexadecyl trimethyl ammonium bromide (CTAB) and sodium laurylsulfonate (SLS) were intercalated into Na-montmorillonite layers through ion exchange, resulting increased basal spacing of the interlayers, as well as the change of clay surface from hydrophilic to hydrophobic as proved by X-ray diffraction and Fourier transform infrared spectroscopy analyses. Differential thermal analysis, thermogravimetric measurement combined with infrared spectroscopy and derivative thermogravimetric analysis were used to understand the relation between the thermal stability and the molecular structure of the organo-modified montmorillonites. The results showed that MMT increased the decomposition temperature of ADA, delayed the decomposition temperature of CTAB and SLS, and stimulated the generation of CO2. The interlayer space might play a more significant role than the external surface of MMT in influencing the pyrolysis of OMMT.
KeywordsMontmorillonite (MMT) Modification Thermal stability Molecular structure Pyrolysis
This work was financially supported by the National Key Research and Development Program of China (2017YFD0600203).