Increasing Salt Rejection of Polybenzimidazole Nanofiltration Membranes via the Addition of Immobilized and Aligned Aquaporins
| Autor: | Ryan Blood, Priyesh Wagh, Prasangi Rajapaksha, Isabel C. Escobar, Yinan Wei, Peter M. Kekenes-Huskey, Xinyi Zhang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Aquaporin
Bioengineering 02 engineering and technology lcsh:Chemical technology 010402 general chemistry 01 natural sciences Article lcsh:Chemistry Boric acid chemistry.chemical_compound Chemical Engineering (miscellaneous) lcsh:TP1-1185 aquaporins chemistry.chemical_classification Process Chemistry and Technology Polymer biomimetic 021001 nanoscience & nanotechnology 0104 chemical sciences Membrane lcsh:QD1-999 chemistry Covalent bond nanofiltration immobilization Urea Nanofiltration 0210 nano-technology Nuclear chemistry Cysteine |
| Zdroj: | Processes Volume 7 Issue 2 Processes, Vol 7, Iss 2, p 76 (2019) Processes (Basel, Switzerland) |
| ISSN: | 2227-9717 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|