LAPSE:2019.0564
Published Article
LAPSE:2019.0564
Increasing Salt Rejection of Polybenzimidazole Nanofiltration Membranes via the Addition of Immobilized and Aligned Aquaporins
Priyesh Wagh, Xinyi Zhang, Ryan Blood, Peter M. Kekenes-Huskey, Prasangi Rajapaksha, Yinan Wei, Isabel C. Escobar
May 16, 2019
Aquaporins are water channel proteins in cell membrane, highly specific for water molecules while restricting the passage of contaminants and small molecules, such as urea and boric acid. Cysteine functional groups were installed on aquaporin Z for covalent attachment to the polymer membrane matrix so that the proteins could be immobilized to the membranes and aligned in the direction of the flow. Depth profiling using x-ray photoelectron spectrometer (XPS) analysis showed the presence of functional groups corresponding to aquaporin Z modified with cysteine (Aqp-SH). Aqp-SH modified membranes showed a higher salt rejection as compared to unmodified membranes. For 2 M NaCl and CaCl₂ solutions, the rejection obtained from Aqp-SH membranes was 49.3 ± 7.5% and 59.1 ± 5.1%. On the other hand, the rejections obtained for 2 M NaCl and CaCl₂ solutions from unmodified membranes were 0.8 ± 0.4% and 1.3 ± 0.2% respectively. Furthermore, Aqp-SH membranes did not show a significant decrease in salt rejection with increasing feed concentrations, as was observed with other membranes. Through simulation studies, it was determined that there was approximately 24% capping of membrane pores by dispersed aquaporins.
Keywords
aquaporins, biomimetic, immobilization, nanofiltration
Subject
Suggested Citation
Wagh P, Zhang X, Blood R, Kekenes-Huskey PM, Rajapaksha P, Wei Y, Escobar IC. Increasing Salt Rejection of Polybenzimidazole Nanofiltration Membranes via the Addition of Immobilized and Aligned Aquaporins. (2019). LAPSE:2019.0564
Author Affiliations
Wagh P: Chemical and Materials Engineering Department, University of Kentucky, Lexington, KY 40506, USA [ORCID]
Zhang X: Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA [ORCID]
Blood R: Chemical and Materials Engineering Department, University of Kentucky, Lexington, KY 40506, USA
Kekenes-Huskey PM: Chemical and Materials Engineering Department, University of Kentucky, Lexington, KY 40506, USA; Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA [ORCID]
Rajapaksha P: Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
Wei Y: Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
Escobar IC: Chemical and Materials Engineering Department, University of Kentucky, Lexington, KY 40506, USA [ORCID]
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Journal Name
Processes
Volume
7
Issue
2
Article Number
E76
Year
2019
Publication Date
2019-02-03
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr7020076, Publication Type: Journal Article
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LAPSE:2019.0564
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doi:10.3390/pr7020076
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May 16, 2019
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CC BY 4.0
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May 16, 2019
 
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Calvin Tsay
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