COMPETITIVE ADSORPTION OF PHENOLIC ACIDS ON ALLOPHANIC, HALLOYSITIC, AND ILLITIC CLAYS

概要

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Phenolic acids are not only the normal organic constituents of most agricultural soils and the decayed products of plant lignin but also regarded as the main supplements of humic substances. In this paper, the competitive adsorptions between two kinds of phenolic acids on allophanic, halloysitic, and illitic clays were studied. The adsorptions of p-hydroxybenzoic acid and protocatechuic acid were enhanced in the presence of phenolic acids of different kind on both halloysitic and illitic clays, On allophanic clay both constituents were adsorbed more or less, but these amounts were roughly same as the estimated values which measured by the independent phenolic acid at the same pH and concentration conditions. The hydroxyl group at p-position and methoxyl group at m-position of benzoic acid enhanced the retentions of protocatechuic acid and p-hydroxybenzoic acid, and so the coexisting of vanillic or ferulic acid were more effective than that of other phenolic acid examined in the present study. The adsorption mechanisms were proposed that protocatechuic acid and p-hydroxybenzoic acid were mainly adsorbed by electrostatic forces on allophanic clay and by hydrogen bondings with the interlayer oxy-hydroxy groups on halloysitic clay.
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