Scientia Silvae Sinicae ›› 2009, Vol. 12 ›› Issue (8): 113-116.doi: 10.11707/j.1001-7488.20090820
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Zhang Qiwei,Wang Guixian,Wang Muhua
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Abstract:
The adsorption property, thermodynamic parameters and kinetic parameters of nitrobenzene with bamboo-charcoal were studied in this paper. The result shows that adsorption equilibrium time is 540 min and the bamboo-charcoal shows high adsorption ability for nitrobenzene at the pH of 5.6. Langmuir isotherm model is well obeyed. The studying kinetics shows that the adsorption kinetics of bamboo-charcoal on nitrobenzene can be described by pseudo first-order kinetics. The adsorption apparent rate constant k298 is equal to 2.42×10-4s-1 and activation energy Ea is equal to 23.5 kJ·mol-1 at the temperature of 298 K. The studying thermodynamic shows that the adsorption process of bamboo-charcoal on nitrobenzene is an exothermic process. The heat of adsorption (ΔH) is equal to -16.8 kJ·mol-1, entropy change(ΔS) is equal to 37.9 J·K-1mol-1 and free energy change (ΔG) is equal to -28.1 kJ·mol-1. The ΔG is a negative value shows that the adsorption process of adsorbate from solution to adsorbent surface is a spontaneous process.
Key words: bamboo-charcoal, nitrobenzene, adsorption property, kinetic parameters, thermodynamic parameters
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Zhang Qiwei;Wang Guixian;Wang Muhua. Thermodynamic and Kinetic Parameters for Adsorption of Nitrobenzene by Bamboo-Charcoal[J]. Scientia Silvae Sinicae, 2009, 12(8): 113-116.
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URL: http://www.linyekexue.net/EN/10.11707/j.1001-7488.20090820
http://www.linyekexue.net/EN/Y2009/V12/I8/113