Abstract
The suitability and applicability of using Methylene Blue (MB), a cationic dye, for cation-exchange capacity (CEC) and specific surface area (SSA) determinations has been studied extensively. Although many workers have reported satisfactory results between the CEC determined by the MB method and other methods, large discrepancies among CEC values determined by different methods are also found in the literature. The work reported herein was focused at elucidating the interlayer configuration of adsorbed/intercalated MB in SAz-1, a high-charge montmorillonite, using MB adsorption, exchangeable cation desorption, counterion (Cl-) adsorption, X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) analyses. A complete balance between the amount of MB cation adsorbed and that of exchangeable cations desorbed at a 1:1 charge ratio for MB uptake by SAz-1 indicated that cation-exchange was the most important mechanism in this case together with supplementary hydrogen bonding. The adsorbed MB molecules asso...
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