Adsorption of Carbon Disulfide in Water by Different Types of Activated Carbon—Equilibrium, Dynamics, and Mathematical Modeling
Publication: Journal of Environmental Engineering
Volume 133, Issue 3
Abstract
Adsorption equilibrium and kinetics of carbon disulfide in water by granular activated carbon (GAC), powdered activated carbon (PAC), and activated carbon fiber (ACF) were investigated and compared in an effort to elucidate the fundamentals for optimizing the control process design. It has been shown that the BET expression can satisfactorily describe the adsorption equilibrium of carbon disulfide ( ) on GAC, PAC, and ACF and the corresponding kinetic experimental data properly correlated with the second-order kinetic model, which indicates that the adsorption is the rate-limiting step. A two-phase mathematical model was developed to simulate transfer in fixed-bed operation filled with the GAC, PAC, and ACF, and the equilibrium and kinetics information is subsequently used in the model to characterize the dynamics of adsorption. The model includes mechanisms such as axial dispersion, advection, liquid-to-solid mass transport, and intraparticle mass transport by pore and surface diffusion. It is manifested that the model was able to predict the dynamic breakthrough curve of in a fixed-bed adsorption column filled with GAC, PAC, and ACF at varied conditions (standard deviations for is 12.13% and for is 16.12%), based on BET-3 equilibrium and second-order kinetics, which indicates that the methodology proposed by this work could be employed for adsorbents selection, adsorption design, and process optimization for waste-water emission control.
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Acknowledgments
This research is based upon work supported by the Natural Science Foundation of China (Project No. UNSPECIFIED20507014). Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the writers and do not necessarily reflect the view of the supporting organizations. The writers are grateful to Yalin Wang for advice and troubleshooting the experimental apparatus and sample analysis.
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Published In
Journal of Environmental Engineering
Volume 133 • Issue 3 • March 2007
Pages: 294 - 302
Copyright
© 2007 ASCE.
History
Received: Dec 20, 2005
Accepted: Aug 15, 2006
Published online: Mar 1, 2007
Published in print: Mar 2007
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