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exchange, the material was vacuum filtered and washed with copious amounts of deionized water until no free ions were present in the filter water (i.e., no precipitation upon treatment with Cl-). The silver exchanged materials were dried at room temperature and atmospheric conditions in a dark area. The resulting materials were then stored in a dark area until they were dehydrated in vacuo prior to analysis. Preparation of LixAgy-Zeolites. The LixAgy-zeolites (which may more accurately be referred to as LixNayAgz-zeolites since ion exchange is rarely exhaustive and there is almost always some residual Na+ present in the starting Li-zeolite) were prepared by ion exchange of a Li-zeolite (prepared as described above) with a 0.05 M solution of AgNO3. This silver solution contained a cation content which was equivalent to the targeted amount. This is possible with silver ion-exchange because the silver cation is quickly and easily exchanged.4 The silver ion-exchange solution was heated to a mild boil and immediately allowed to cool and settle. The resulting material was vacuum filtered and washed with copious amounts of deionized water. Complete incorporation of the targeted silver ions was verified when no precipitation was observed in the filtered water upon treatment with Cl-. These mixed cation zeolites were then dried at room temperature and atmospheric conditions in a dark area and were stored in a dark area until they were dehydrated in vacuo prior to analysis. Dehydration. Prior to measurement of the adsorption isotherms or uptake rates, it is necessary to dehydrate the zeolite sample. Zeolites have a strong affinity for water; and some molecules are tenaciously held. The presence of water in the zeolite significantly affects the validity of the adsorption measurement. Prior to analysis, all samples were heated in order to remove water. Differential thermal analysis (DTA) of 54PDF Image | PSA USING SUPERIOR ADSORBENTS
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