Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (05): 548-551.doi: 10.1016/S1872-1508(06)60020-X

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Adsorption and Aggregative Structures of an Organic Cation [C18mim]＋ of the Ionic Liquid in the Interlayer of Montmorillonite

Ding Yun-Sheng;Wang Seng-Shan;Zha Min;Wang Zhi-Gang   

  1. Department of Polymer Materials and Engineering, College of Chemistry and Engineering, Hefei University of Technology,Hefei 230009, P. R. China； CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials,Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China
  • Received:2005-11-07 Revised:2005-12-09 Published:2006-04-28
  • Contact: Ding Yun-Sheng E-mail:dingys@hfut.edu.cn

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Abstract: An organic cation [C18mim]+ formed from [C18mim]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 [C18mim]+ in the interlayer ofMMThave been investigated by thermogravimetric analysis (TGA), wide-angle X-ray diffraction (XRD), and Fourier transforminfrared spectroscopy (FTIR). The results indicated that there is a maximum chemical adsorption of [C18mim]+ in the interlayer of MMT, but the total amount of adsorbed [C18mim]+ in the interlayer of MMT increases with the physical adsorption of [C18mim]+. With the increasing amount of adsorbed [C18mim]+ in the interlayer of MMT, the aggregative structures of [C18mim]+ become more ordered, leading to an obvious increase of the interlayer distance of MMT.

Key words: Ionic liquid, Montmorillonite, Absorption, Aggregative structure