Ammonium Ion Exchange Behaviors on Natural Clinoptilolites

概要

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The amounts of ammonium ion exchange on natural clinoptilolites were investigated in ammonium chloride solution for the samples from Akita, Japan and Mount Gipps, Australia together with that from Shimane, Japan reported previously. The exchange capacity for the natural ciinoptilolite from Akita, which consists of almost pure clinoptilolite, showed the highest ammonium ion exchange value of 1.318 mmol/g. The measured amount of ammonium ions exchanged quantitatively agreed well with the theoretical values of exchanged ions calculated by an equation between the concentration of ammonium ion and that of the exchanged ions on the zeolites in ammonium chloride solution. The ammonium ion was mainly exchanged with Na+, K+ and Ca2+ ions on these clnoptilohtes. By changing the concentration of the ammonium chloride solution, the dissolved Na+ amount was the largest among these three ions. This showed that the ammonium ion was dominantly exchanged with Na+ ion. The exchange capacity of Na-rich Shimane clinoptilolite was smaller than that of the K-rich Akita sample. This indicated that the ion-exchange was depend not only the ion species on the natural clinoptilolites but also contained impurities such as quartz and feldspar.
日本イオン交換学会の論文