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Abstract
The effect of pH and Ca(OH)2 concentration on organic compound adsorption to organoclays was investigated. The adsorption of phenol, nitrobenzene (NB), 1,2‐dichlorobenzene (DCB) onto two organoclays was studied. Two types of solutions were utilized for the adsorption studies, distilled‐deionized water, and distilled‐deionized water spiked with cement to raise its pH and Ca(OH)2 concentration.
The results of the study indicated that the adsorption of the nonionic compounds, NB and DCB, onto organoclays from water was not affected by high pH or Ca(OH)2 conditions. However, the adsorption of the ionic phenol onto the organoclays was affected by changes in high pH and Ca(OH)2 conditions. These results supported the premise that the adsorption of nonionic organic compounds involves partitioning of the organic onto the organic fraction of the organoclays and not onto the clay surface, while the organoclays may adsorb a portion of ionic compounds at the clay surface.