Abstract
Abstract In this study the effects of the surface acidity of adsorbents on adsorption from solution are investigated. For this purpose, methylene blue (cationic) and metanil yellow (anionic) adsorbates, which have opposite ionic characters, are used. At 298 K, the values of surface acidity indicate that methylene blue molecules occur on the surface at a greater probability than those of metanil yellow. That is, metanil yellow molecules are repulsed from the surface and methylene blue molecules are attracted to the surface.
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