Abstract
This paper discusses the effect of the chemical structure of sulfonated poly(aryl ether sulfone) on the performance of composite nanofiltration membranes. The composite nanofiltration membranes were fabricated by coating sulfonated poly(aryl ether sulfone) solution onto the top surface of poly(phthalazinone ether sulfone ketone) support membranes. Three kinds of sulfonated poly(aryl ether sulfone)s with different amounts of phthalazinone moieties, namely, sulfonated poly(phthalazinone ether sulfone) (SPPES), sulfonated poly(phthalazinone biphenyl ether sulfone) (SPPBES), and sulfonated poly(phthalazinone hydroquinone ether sulfone)s (SPPHES), were used as coating materials. The solvents used in preparing the coating solution were investigated and optimized. The separation properties, thermal stability, and chlorine resistance of composite membranes were determined. The structures and morphologies of membranes were characterized with FTIR and SEM, respectively. The membrane prepared from SPPES with more phthalazinone moiety groups showed high water flux and salt rejection. The salt rejection of composite membranes followed the order SPPES > SPPHES > SPPBES. The rejection of the three composite membranes decreased slightly with the solution temperature rising from 20 to 90 °C, while the composite membrane with SPPES as the active layer showed a higher increase in flux than others. The results indicate that SPPES composite membranes show better thermal stability than others.
Highlights
Access to secure, sustainable sources of fresh water is one of the urgent needs in this century [1,2].Membrane separation technology, as a method for wastewater treatment, is considered as an economical and environmentally friendly process
A new at 1024 cmin absorption at absorption cm−1 appeared the spectra of sulfonated poly(phthalazinone ether sulfone) (SPPES), sulfonated poly(phthalazinone biphenyl ether sulfone) (SPPBES), and sulfonated poly(phthalazinone hydroquinone ether sulfone)s (SPPHES) composite composite membranes, while it wasinabsent in the spectrum of poly(phthalazinone ether sulfone ketone)s (PPESK)
Four solvent systems used in preparing the coating solution were investigated, and amounts of phthalazinone moieties (SPPES, SPPBES, SPPHES) as the selective layer via the dipEGME + ethanol (4:1) was selected as the optimal solvent system
Summary
Sustainable sources of fresh water is one of the urgent needs in this century [1,2]. Sulfonated poly(aryl ether sulfone), such as SPPES, SPPBES, and SPPHES, were prepared. These polymers exhibit from PPES, PPBES, and PPHES, respectively [24,25,26]. This work, a systematic studyon onsulfonated sulfonated poly(aryl sulfone) nanofiltration membranes was was performed to todemonstrate effectofof chemical structure on membrane performance. The composite membranes membranes were poly(aryl ether sulfone)s withwith different. The composite werefabricated fabricatedfrom fromsulfonated sulfonated poly(aryl ether sulfone)s different amounts of phthalazinone moieties a similar of sulfonation. Separation properties, chlorine resistance, and thermal stability thermal stability of the membranes prepared from different sulfonated poly(aryl ether sulfone)s were of the membranes prepared from different sulfonated poly(aryl ether sulfone)s were investigated. (SPPBES), and sulfonated poly(phthalazinone hydroquinone ether sulfone)s (SPPHES)
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