Adsorption behavior and mechanism of imidazole-based ionic liquids on montmorillonite
ZHAO Mei, CHEN Guang-shi, WEI Li, QIU Yu-ping
State Key Laboratory of Pollution Control and Resource Reuse, Department of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
Sorption of imidazole-based ionic liquids (IBILs) with different alkyl chain lengths and anions onto Na-modified montmorillonite (Na/MMT) as affected by ionic strength and solution pH was investigated. The Na/MMT before and after sorption was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Scanning Electron Microscope (SEM). Sorption of IBILs on Na/MMT was due to the cation exchange interaction and the hydrophobic interaction between IBILs cations and Na/MMT while the effect of IBIL anions was negligible. Furthermore, the adsorption capacities were influenced by the alkyl chain length of IBILs cations. The longer the alkyl chain length, the greater adsorption capacity on the montmorillonite. The equilibrium adsorption of EmimBF4, BmimBF4, HmimBF4 and OmimBF4 was 33.94, 40.48, 44.40 and 53.29mmol/100g, respectively. The interlayer spacing of Na/MMT increased from 12.77Å to 14.41Å with the increase of the alkyl chain length. Both decreasing background ionic strength and increasing of solution pH will enhance the adsorption of IBILS on montmorillonite.
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