Journal of Industrial and Engineering Chemistry, Vol.9, No.2, 117-124, March, 2003
Properties of Metal Supported Porous Carbon and Bactericidal Effects
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The studies on physicochemical properties and bactericidal effects of the Ag, Cd and Cu-treated activated carbons are carried out. According to the adsorption studies, it is confirmed that all of the metal-treated activated carbons have micropore structure rather than mesopore structure. The surface areas of the treated carbon obtained from BET equation are in the range of 741 ~ 1112, 1104 ~ 1418 and 1084 ~ 1361 m(2)/g for Ag-AC, Cd-AC and Cu-AC, respectively. Upon the micropore volumes obtained from αs-plot, decrease of micropore volume is dependant on the contents of treated-metal except Ag. From the SEM study, it is observed that much of micropores in activated carbon are blocked by window blocking effect of metals after the treatment. Combining the information obtained from the studies on adsorption isotherms, specific surface area, and micropore volume, it is recognized that Ag shows different behavior from other metals. It is postulated that the differences in adsorption properties among the metals are mainly due to different blocking effects. And the effects depend on the way of distribution, the shape of metal particles, and the pattern of aggregates. Finally, bactericidal effects of metal treated activated carbon against Escherichia coli are discussed. Comparing the effects among the metals employed, the highest effects are obtained from Cd, while the lowest effects are obtained from Cu. Antibacterial activity becomes higher with the increase of the amount of metal treated. From the shake flask test, the optimum concentrations of metals are known to be 0.4 mole for Ag, 0.1 mole for Cd, and 0.6 mole for Cu, respectively.
Keywords:activated carbon;surface treatment;scanning electron microscopy (SEM);adsorption properties
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