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was allowed to cool and settle. The supernate was then decanted; and, the procedure was repeated. The resulting Co(II)-substrate was then filtered, washed with copious amounts of deionized water, and dried at 100 C overnight. The next step of the synthesis was to slurry 0.2 g of the Co(II)-substrate in 6 mL DI water. Separately, 0.71 mmol of 3-fluorosaliclyaldehyde was dissolved in 600 μL EtOH as before by heating. To this solution 25 μL of ethylenediamine was added followed immediately by 105 μL of piperidine. The Co(II)-substrate slurry was then added to this material with good mixing; and, the resultant was heated out of contact with air for 1 hour. The resulting material, which had a brownish-red color, was then filtered, washed with copious amounts of DI water and dried in an oven at 100 C. Characterization Methods. The samples were analyzed for Co content using an inductively coupled plasma mass spectrometer (ICP-MS, Hewlett Packard HP 4500). The samples were first digested in concentrated nitric acid solution at 100 C for 20 min. At the end of digestion, the samples were further diluted and filtered before analysis using ICP-MS. Analyses for C and F content were performed by Galbraith Laboratories (Knoxville, TN). The adsorption isotherms were measured using a static volumetric system (Micromeritics ASAP-2010). Prior to measurement of isotherms, the samples were activated (deoxygenated) in a vacuum at 120 - 160 C for a minimum of 1 hour. Oxygenated samples were black in color; while the activated/deoxygenated samples had a brownish red color. Additions of the analysis gas were made at volumes required to achieve a targeted set of pressures. A minimum equilibrium interval of 30 seconds with a 160PDF Image | PSA USING SUPERIOR ADSORBENTS
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