Adsorption of orthophosphate on a synthetic silica-alumina.
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概要
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The characteristics and mechanism of the adsorption of orthophosphate on a commercial synthetic silica–alumina, Neobead D, were studied. The adsorption rate increased with decrease in pH and increase in the dose of silica–alumina below the concentration of 4 g dm<SUP>−3</SUP>. The adsorption almost terminated in 24 h, but a very slow reaction was observed even after 3 d. The adsorption isotherm follows the Freundlich equation, the inflection in the log-log plot indicating difference in the adsorption mechanism between low and high phosphate concentrations. The adsorption capacity increased with decrease in pH, being the highest at an initial pH of 3.0. The silica–alumina exhibited buffer action, phosphate-free solutions of pH 4–10 showing pH of <I>ca.</I> 6 after 24 h. In coincidence with and in proportion to the adsorption, release of hydroxide, sulfate and silicate ions occurred in the reaction of initial pH of 4.7. The sum of the equivalents of the three anions released could well account for the moles of phosphate adsorbed. The adsorption thus proceeds mainly through the ion-exchange process between phosphate in solution and the anions on the solid, univalent phosphate ions taking part in the reaction.
- 公益社団法人 日本化学会の論文
著者
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Shiokawa Jiro
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Tokunaga Shuzo
National Chemical Laboratory for Industry
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