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Frontiers of Chemical Science and Engineering >> 2011, Volume 5, Issue 2 doi: 10.1007/s11705-010-0571-0

Kinetics and thermodynamics of the phosphine adsorption on the modified activated carbon

1. School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 2. College of Environment and Safety, Taiyuan University of Science and Technology, Taiyuan 030024, China

Available online:2011-06-05

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The kinetics and the thermodynamics of phosphine (PH ) adsorption on the modified activated carbon have been explained for the adsorption process of PH . This study investigated the kinetic and thermodynamic properties of PH adsorption on the activated carbon impregnated with 5% HCl solution. The thermodynamic properties including PH adsorption isotherm and adsorption heat were separately investigated at 20°C, 70°C, 90°C. The results showed that the Freundlich-type isotherm equation described the isotherms well. The adsorption capacity increased with increasing temperature between 20°C and 70°C. Between 70°C and 90°C, the adsorption capacity decreased obviously with increasing temperature. The adsorption capacity reached the maximum at 70°C. By analyzing the results of the kinetics and the thermodynamics, we found that the adsorption of PH was dominated by physical adsorption at the lower temperature (20°C). Then with increasing temperature, chemical adsorption gradually dominated in the adsorption process. The adsorption capacity decreased at above 70°C is due to the exothermic effects in the process of adsorption.

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