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In relation to this article, we declare that there is no conflict of interest.
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Received April 8, 2018
Accepted June 13, 2018
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Removal of Zn (II) by complexation-ultrafiltration using rotating disk membrane and the shear stability of PAA-Zn complex

School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
csu_tian@csu.edu.cn
Korean Journal of Chemical Engineering, October 2018, 35(10), 2078-2085(8), 10.1007/s11814-018-0105-x
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Abstract

Polyacrylic acid sodium (PAAS) was applied to remove Zn (II) from aqueous solutions by complexationultrafiltration using a rotating disk membrane module. As important factors, solution pH and the mass ratio of polymer to metal ions (P/M) on the rejection of Zn (II) were investigated, and the rejection could reach to 95.3% at pH=7, P/M=25 and 500 rpm. In addition, a partition model was proposed to reveal instability mechanism of the PAA-Zn complex in the shear field for the first time. The critical rotating speeds at which PAA-Zn complexes begin to dissociate were 1,460, 1,390, 1,280 rpm at pH 7.0, 6.0, 5.0, respectively. The corresponding critical shear rates (γc), the smallest shear rates at which PAA-Zn complex begins to dissociate, were 1.58 X 10 5, 1.45 X 10 5 and 1.25 X 10 5 s-1 at pH 7.0, 6.0, 5.0, respectively. In addition, the relationship between the critical radii and the critical rotating speed was obtained.

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