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CLC number: TQ15

On-line Access: 2012-07-03

Received: 2012-01-10

Revision Accepted: 2012-04-28

Crosschecked: 2012-05-29

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Journal of Zhejiang University SCIENCE A 2012 Vol.13 No.7 P.546-558


Enhancement of ion transport in porous media by the use of a continuously reoriented electric field

Author(s):  Juan Almeira, Chang-sheng Peng, Ahmed Abou-Shady

Affiliation(s):  College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China

Corresponding email(s):   cspeng@ouc.edu.cn

Key Words:  Electromigration, Heavy metals, Kaolin, Electric field orientation, Tortuosity, Rotating electrodes

Juan Almeira, Chang-sheng Peng, Ahmed Abou-Shady. Enhancement of ion transport in porous media by the use of a continuously reoriented electric field[J]. Journal of Zhejiang University Science A, 2012, 13(7): 546-558.

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author="Juan Almeira, Chang-sheng Peng, Ahmed Abou-Shady",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

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%T Enhancement of ion transport in porous media by the use of a continuously reoriented electric field
%A Juan Almeira
%A Chang-sheng Peng
%A Ahmed Abou-Shady
%J Journal of Zhejiang University SCIENCE A
%V 13
%N 7
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%D 2012
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1200017

T1 - Enhancement of ion transport in porous media by the use of a continuously reoriented electric field
A1 - Juan Almeira
A1 - Chang-sheng Peng
A1 - Ahmed Abou-Shady
J0 - Journal of Zhejiang University Science A
VL - 13
IS - 7
SP - 546
EP - 558
%@ 1673-565X
Y1 - 2012
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1200017

electromigration in porous media is enhanced by a new type of electrokinetic processing. Compared with a single -oriented electric field, a continuously reoriented electric field was proven to sharply enhance mass transport of several heavy metals in kaolin. The initial concentration of the metals was: Cd: 250 mg/kg; Cu: 250 mg/kg; Ni: 250 mg/kg; Zn: 900 mg/kg. Electric field reorientation was obtained by the use of a fixed anode and a cathode that rotated at different frequencies (0, 0.25, 1.00, 1.25, 2.00, 5.00 and 10.00 r/m). Mass transport evidently increased from 0 r/m to 1.25 r/m, and then decreased as the rotation speed reached 10 r/m. From 0 r/m to 1.25 r/m, mass transport increased 2.87 times for Cd, 3.17 times for Cu, 2.11 times for Ni, and 4.13 times for Zn. We suggest that continuous reorientation of the electric field facilitates the advance of ions through kaolin pores, minimizing the retardation effect caused by media tortuosity.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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