Journal
ACTA PHYSICO-CHIMICA SINICA
Volume 22, Issue 5, Pages 548-551Publisher
PEKING UNIV PRESS
DOI: 10.1016/S1872-1508(06)60020-X
Keywords
ionic liquid; montmorillonite; absorption; aggregative structure
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An organic cation [C(18)mim](+) formed from [C(18)mim]Br, one type of ionic liquids, can go into the interlayer of sodium montmorillonite (MMT) through the ion-exchanging reaction. The adsorption state, the adsorption amount, and the aggregative structure of [C(18)mim](+) in the interlayer of MMT have been investigated by thermogravimetric analysis (TGA), wide-angle X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results indicated that there is a maximum chemical adsorption of [C(18)mim](+) in the interlayer of MMT, but the total amount of adsorbed [C(18)mim](+) in the interlayer of MMT increases with the physical adsorption of [C(18)mim](+). With the increasing amount of adsorbed [C(18)mim](+) in the interlayer of MMT, the aggregative structures of [C(18)mim](+) become more ordered, leading to an obvious increase of the interlayer distance of MMT.
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