Abstract
Activated charcoal cloth (ACC) has been impregnated with copper by the reduction of copper(II) nitrate using sodium hypophosphite in situ. This method has produced samples with excellent hydrogen cyanide (HCN) adsorption properties. However, the production of cyanogen ((CN) 2) due to the presence of copper(II) posed a considerable drawback, since (CN) 2 itself is highly toxic (threshold limit value = 11 ppm). The (CN) 2 could be removed by further impregnation of the ACC with alkaline chromate, which had the advantage of enhancing the effectiveness of HCN chemisorption. The adsorption of HCN was measured as a function of bed weight for copper and copper-chromate impregnated ACC. The kinetic saturation capacities ( W e ) were found to be 0.048 ± 0.006 and 0.13 ± 0.01 g (HCN) per gram of impregnated ACC, respectively, and the pseudo-first-order rate constant for the copper impregnated sample was 16,000 ± 2000 min −1. A value for the copper-chromate impregnated ACC could not be determined due to a loss of linearity at low bed weights. The theoretical dependence of the breakthrough time ( t B) on flow rate was compared with experimentally obtained data and was found to be in good agreement.
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