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| Adsorption kinetics of p-nitroaniline onto microporous carbon activation with KOH |
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Abstract Low-cost activated carbon was prepared from Spartina alterniflora from a two-step thermo-chemical process by KOH activation. The adsorption equilibrium and kinetic behavior of p-nitroaniline onto the carbon was investigated by conducting a series of batch adsorption experiments, and adsorption mechanism was discussed from kinetic point of view. The pseudo-second-order model was found to explain the adsorption kinetics most effectively. It was also found that the pore diffusion played an important role in the adsorption, and intra-particle diffusion was the rate-limiting step at the first 25 min for the temperatures of 15, 25 and 35℃. The Freundlich isotherm was found to best describe the experimental data. The maximum adsorption capacity of p-nitroaniline was found to be 719 mg/g for initial p-nitroaniline concentration of 200 mg/L at 15℃.
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Received: 22 July 2009
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