The mesopore content of a commercial activated carbon was increased by catalytic activation over various metal oxides. The adsorption of VB12 and Congo red was measured to investigate the effect of pore structure upon the adsorption property. It was found that both the pore size distribution and the pore volume play key roles in determining the adsorption properties. The wider the pore size was, the shorter of time reaching equilibrium was: Higher pore volume gave higher adsorption capacity.
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