Effect of surface properties of activated carbons on surfactant adsorption kinetics |
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Authors: | Jung-Hee Kim Sophie H Wu Phillip Pendleton |
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Affiliation: | (1) Department of Chemical Engineering, Pukyong National University, 608-739 Busan, Korea;(2) Center for Molecular and Materials Sciences, University of South Australia, 5095 Mawson Lakes, SA, Australia |
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Abstract: | This research investigates the adsorption properties of three activated carbons (AC) derived from coconut, coal, and wood
origin. A linear relationship exists between the number of water molecules adsorbed onto each AC and the oxygen content determined
elemental analysis and XPS. An inverse linear relationship exists between the plateau amount of dodecanoic acid anionic surfactant
and the oxygen content on the surface of ACs. The surface charge on each AC’s surface had a linear relationship with the plateau
amount of dodecanoic acid. A plug-flow heterogeneous surface diffusion model (PFHSDM) for a fixed-bed adsorption process was
developed to describe the adsorption kinetics in a fixed-bed column. The model represents axially dispersed plug-flow, external
mass transfer, adsorption equilibrium on the fluid-particle interface, and intraparticle diffusion. The larger molecular dimension
of the dodecanoic acid as a more hydrophobic entity than octanoic acid led to a faster external mass transfer rate but a slower
surface diffusion rate as estimated from the PFHSDM. The interaction between the organic moiety of surfactant and the AC surface
chemistry such as surface oxygen content and surface charge contributes to the adsorption performance in both to the adsorption
equilibrium and kinetics. |
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Keywords: | Surface Chemistry Mathematical Model Fixed-Bed Adsorption Activated Carbons Anionic Surfactants |
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