Abstract
An investigation has been carried out on the adsorption of silver cyanide from solution onto activated charcoal. The isosteric heats of adsorption and equilibrium constants for adsorption were determined from adsorption isotherms. The isosteric heat and equilibrium adsorption constants were shown to decrease with increasing surface coverage at low surface coverages while at intermediate surface coverages they remain fairly constant. The experimental isotherm data was found to fit the Langmuir adsorption isotherm in this intermediate range of surface coverage. A pore diffusion model was utilized to explain the experimental rate data. The experimental rates were found to be controlled by pore diffusion with the effective diffusivity having an activation energy of 2.6 kcal/mol. Good agreement between experimental rate data and predicted rate curve by the diffusion model was obtained.
Published Version
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