|Title:||Polymer inclusion membranes with strip dispersion||Authors:||Li, Yueh Hsien
Wang, Da Ming
Chan, Kuan Ying
Lai, Juin Yih
|Keywords:||Hydrolysis | Indium | Polymer inclusion membranes | Stability | Strip dispersion||Issue Date:||3-Jun-2017||Publisher:||MDPI AG||Journal Volume:||9||Journal Issue:||6||Start page/Pages:||399||Source:||Water (Switzerland)||Abstract:||
© 2017 by the authors. 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.
|Appears in Collections:||化學工程學系|
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