Adsorption of Methylene Blue ( MB) on Na-, Fe- and Al-montmorillonite suspensions at 298.15 K were studied. The effect of different exchangeable cation on the adsorption amount of MB was determined. The results show that methylene blue cations( MB+ ) replace Na∗ more easily than they do Fe3+ and Al3 + The adsorption isotherms on the three montraorillonites were all of Langmuir type, except that the isouHerm of MB on Na-montmorillonite presents nonmonotonic curve at low surface coverage. The specific surface areas in suspension were calculated by( MB 3 + )method, and Na− is more effective to determine the specific surface area by MB method in suspension than Fe3 + and A3 + The discrepancy of the specific surface area measured by MB and BET method was discussed.
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Chen et al. (1999) studied this question.
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