Abstract
Studies on the use of various pyridines (e.g., pyridine, 4-vinylpyridine, 4-aminopyridine, 4-cyanopyridine, and 4-n-propylpyridine) to modify the adsorptive properties of charcoal are described. The impregnated charcoals are compared with respect to adsorption capacity for carbon tetrachloride and cyanogen chloride under dynamic conditions and relative affinity for methyl iodide under equilibrium conditions. In several cases, the effect of impregnant concentration and method of impregnation were examined in detail. As part of the overall study, it was interesting to find that adsorption of 4-vinylpyridine resulted in the formation of ethanol intractable material (presumably polymer) on the surface of the charcoal which still exhibited chemical reaction activity. It would appear that adsorption of 4-vinylpyridine results in polymerization with a molecular orientation which allows pyridine nitrogens to be available for chemical reactivity. A charcoal prepared by adsorption of poly-4-vinylpyridine showed little chemical reactivity.
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