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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 that was equivalent to the targeted amount. This is possible with silver ion-exchange because the silver cation is quickly and easily exchanged (Breck, 1984). 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. The samples were compositionally characterized using neutron activation analysis (NAA) at the research nuclear reactor of the Phoenix Memorial Laboratory at the University of Michigan. The samples were irradiated sequentially for one minute at a core-face location with an average thermal neutron flux of 2 x 1012 n/cm2/s. Two separate gamma-ray spectra were collected for 500 seconds real time for each sample using a high resolution germanium detector. The collection after a 13 minute decay was used to determine the concentrations of aluminum and silver, while data collected after 1 hour and 56 min decay were used to analyze for sodium and potassium. Four replicates of NBS-SRM-1633a (coal fly ash) and silver foil were used as standard reference materials and check standards. 90PDF Image | PSA USING SUPERIOR ADSORBENTS
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