RESEARCH ARTICLE

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

  • Bingnan REN , 1,2
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  • 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

Received date: 12 Nov 2010

Accepted date: 10 Feb 2011

Published date: 05 Jun 2011

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg

Abstract

The kinetics and the thermodynamics of phosphine (PH3) adsorption on the modified activated carbon have been explained for the adsorption process of PH3. This study investigated the kinetic and thermodynamic properties of PH3 adsorption on the activated carbon impregnated with 5% HCl solution. The thermodynamic properties including PH3 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 PH3 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.

Cite this article

Bingnan REN . Kinetics and thermodynamics of the phosphine adsorption on the modified activated carbon[J]. Frontiers of Chemical Science and Engineering, 2011 , 5(2) : 203 -208 . DOI: 10.1007/s11705-010-0571-0

Acknowledgments

The author thanks Dr. Jing Geng for providing the valuable advices for this work.
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