Kinetics of enhanced adsorption by polarization for organic pollutants on activated carbon fiber |
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Authors: | Han Yanhe Quan Xie Zhao Huimin Chen Shuo and Zhao Yazhi |
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Institution: | (1) School of Life Science, Liaoning Normal University, Dalian, 116029, China;(2) School of Environmental and Biological Science & Technology, Dalian University of Technology, Dalian, 116023, China |
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Abstract: | The adsorption kinetics for model pollutants on activated carbon fiber (ACF) by polarization was investigated in this work.
Kinetics data obtained for the adsorption of these model pollutants at open-circuit, 400 mV, and −400 mV polarization were
applied to the Lagergren equation, and adsorption rate constants (K
a) were determined. With the anodic polarization of 400 mV, the capacity of sodium phenoxide was increased from 0.0083 mmol/g
at open-circuit to 0.18 mmol/g, and a 17-fold enhancement was achieved; however, the capacity of p-nitrophenol was decreased from 2.93 mmol/g at open-circuit to 2.65 mmol/g. With the cathodal polarization of −400 mV, the
capacity of aniline was improved from 3.60 mmol/g at open-circuit to 3.88 mmol/g; however, the capacity of sodium dodecylbenzene
sulfonate was reduced from 2.20 mmol/g at open-circuit to 1.59 mmol/g. The enhancement for electrosorption changed with different
groups substituting. Anodic polarization enhances the adsorption of benzene with the electron-donating group. But whether
anodic or not, cathodal polarization had less effect on the adsorption of electron-accepting aromatic compounds, and decreased
the adsorption capacity of benzene-bearing donor-conjugate bridge-acceptor, while increasing its adsorption rate. Electrostatic
interaction played a very important role in the electrosorption of ion-pollutants.
Translated from Environmental Science, 2006, 27(6): 1111–1116 译自: 环境科学] |
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Keywords: | activated carbon adsorption kinetics Lagergren electrosorption enhanced electron-donating and electron-accepting groups |
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