Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 551, Issue -, Pages 204-213Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.01.047
Keywords
Organic solvent nanofiltration (OSN); Ionic crosslinking; Double crosslinking; Sulfonated polyphenylsulfone (sPPSU); Polybenzimidazole (PBI)
Categories
Funding
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Program for the project [NRF-CRP14-2014-01]
- National Research Foundation, Prime Minister's Office [R-279-000-466-281]
- BASF SE, Germany [R-279-000-363-597]
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In this paper, we report a new technique to design highly stable and selective organic solvent nanofiltration (OSN) membranes with enhanced solvent permeance by manipulating the crosslinking reactions. The new technique consists of three steps: (1) membrane fabrication via non-solvent induced phase inversion by blending sulfonated polyphenylsulfone (sPPSU) and polybenzimidazole (PBI) polymers, followed by (2) crosslinking the PBI part using alpha,alpha'-dibromo-p-xylene (DBX) to make the membrane chemically stable, and (3) ionically cross-linking the sPPSU part with hyperbranched polyethylenimine (HPEI) to narrow down the membrane pore size without affecting the permeance significantly. Crosslinking reactions have been confirmed by FTIR and XPS analyses. The OSN performance of the double crosslinked membranes was determined by measuring the permeance of various organic solvents and the rejection rates of tetracycline (Mw = 444 g mol(-1)) as a model pharmaceutical. Depending on the testing solvents, the permeances ranged from 2 to 11.8 Lm(-2) h(-1) bar(-1), while the rejection rates of tetracycline varied from 67% to 97%. Considering the outstanding OSN performance and the great chemical stability in a wide range of solvent polarities, this novel double crosslinking technique represents a step forward in the fabrication of high performance OSN membranes.
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