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Water 2017, 9(6), 399; doi:10.3390/w9060399

Polymer Inclusion Membranes with Strip Dispersion

1
Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
2
R&D center for Membrane Technology, Chung Yuan University, Chung-Li 32023, Taiwan
3
Center for General Education, China University of Technology, Taipei 11695, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Stephen Gray
Received: 13 March 2017 / Revised: 23 May 2017 / Accepted: 28 May 2017 / Published: 3 June 2017
(This article belongs to the Special Issue Advanced Membranes for Water Treatment)
View Full-Text   |   Download PDF [3083 KB, uploaded 3 June 2017]   |  

Abstract

The present work investigated the permeation of indium ions through a polymer inclusion membrane (PIM), prepared with cellulose triacetate (CTA) as the base polymer, tris(2-butoxyethyl) phosphate (TBEP) as the plasticizer and di-(2-ethylhexyl)phosphoric acid (D2EHPA) as the extractant. With 5 M HCl aqueous solution as the strip solution, we observed an initial indium permeability of 2.4 × 10−4 m/min. However, the permeability decreases with time, dropping to about 3.4 × 10−5 m/min after 200 min of operation. Evidence was obtained showing that hydrolysis of CTA occurred, causing a dramatic decrease in the feed pH (protons transported from strip to feed solutions) and a loss of extractant and plasticizer from the membrane, and then leading to the loss of indium permeability. To alleviate the problem of hydrolysis, we proposed an operation scheme called polymer inclusion membranes with strip dispersion: dispersing the strip solution in extractant-containing oil and then bringing the dispersion to contact with the polymer membrane. Since the strong acid was dispersed in oil, the membrane did not directly contact the strong acid at all times, and membrane hydrolysis was thus alleviated and the loss of indium permeability was effectively prevented. With the proposed scheme, a stable indium permeability of 2.5 × 10−4 m/min was obtained during the whole time period of the permeation experiment. View Full-Text
Keywords: polymer inclusion membranes; strip dispersion; indium; hydrolysis; stability polymer inclusion membranes; strip dispersion; indium; hydrolysis; stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, Y.-H.; Wang, D.-M.; Hsien, T.-Y.; Chan, K.-Y.; Lai, J.-Y. Polymer Inclusion Membranes with Strip Dispersion. Water 2017, 9, 399.

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