Abstract
Mass loss and m/z 18 mass spectrometric ion signal temperature profiles are used to characterize interactions between benzoic acid, salicylic acid, and acetylsalicylic acid adsorbates and potassium, sodium, and calcium montmorillonites. Temperature-dependent water desorption trends show that all three adsorbates cause significant disruptions to clay interlayer water molecule environments. Results suggest that the source of this disruption is the formation of adsorbate–water molecule–cation bridging through the adsorbate acid functionality. Salicylic and acetylsalicylic acids perturb interlayer water molecule environments more than benzoic acid. This is most likely due to the additional hydrogen bond-forming capabilities afforded by the hydroxyl (salicylic acid) and ester (acetylsalicylic acid) groups attached to the aromatic rings of these adsorbates.
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