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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front Chem Sci Eng    2011, Vol. 5 Issue (2) : 203-208    https://doi.org/10.1007/s11705-010-0571-0
RESEARCH ARTICLE
Kinetics and thermodynamics of the phosphine adsorption on the modified activated carbon
Bingnan REN1,2()
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
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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.

Keywords adsorption      PH3      activated carbon      kinetics      thermodynamics     
Corresponding Author(s): REN Bingnan,Email:renbingnan@126.com   
Issue Date: 05 June 2011
 Cite this article:   
Bingnan REN. Kinetics and thermodynamics of the phosphine adsorption on the modified activated carbon[J]. Front Chem Sci Eng, 2011, 5(2): 203-208.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-010-0571-0
https://academic.hep.com.cn/fcse/EN/Y2011/V5/I2/203
Fig.1  Experimental setup for the adsorption of PH over modified activated carbon
samplessurface area /(m2·g-1)micro pore volume /(mL·g-1)total pore volume /(mL·g-1)
pure activated carbon11750.520.58
modified activated carbon9640.400.45
modified activated carbon after adsorption7230.270.31
Tab.1  Textural parameters of the modified activated carbons evaluated from the N adsorption isotherms
Fig.2  Isotherms of the PH adsorption on the modified activated carbon at different temperatures
Fig.3  Freundlich adsorption equation of PH at different temperatures
temperature /°Clna1/nR2Freundlich equation
207.020.250.98X = 0.00089CT0.25
705.790.230.98X = 0.003CT0.23
905.970.140.99X = 0.0026CT0.14
Tab.2  Adsorption equation’s parameters
Fig.4  Linearization of Bangham formula at different temperatures
temperature /°CknR2
200.13 × 10-31.440.97
704.32 × 10-31.700.99
900.67 × 10-31.470.99
Tab.3  Constants of the PH adsorption on modified activated carbons at different temperatures
Fig.5  Adsorption isosteres of PH on the modified activated carbon
temperature /°Ccapacity /(mg·g-1)adsorption isostereR2adsorption heat /(kJ·mol-1)
20-907.02y = -4.27x + 17.080.9835.51
5.79y = -5.66x + 21.830.9947.09
5.97y = -7.44x + 27.410.9961.84
Tab.4  Adsorption isostere’s parameters and adsorption heat
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