Polyacrylonitrile (PAN)/TiO2 mixed matrix membrane synthesis by thermally induced self-crosslinking for thermal and organic-solvent resistant filtration. (31st December 2020)

• Record Type: Journal Article
• Authors: Liu, Qiao; Xu, Nong; Fan, Long; Ding, Aiqin; Dong, Qiang
• Is Part Of: Chemical engineering science. Volume 228(2020)
• Publication Date: 2020-12-31
• Subjects: Mixed matrix membrane -- Thermally induced self-crosslink -- Polyacrylonitrile -- Skin-layer melting -- Heat and solvent-resistant nanofiltration; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2020.115993
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: Thermally crosslinked TPAN@TiO2 membrane was designed and fabricated. Densification of TPAN@TiO2 membrane's skin layer and support were prevented. PAN molecules in TPAN@TiO2 membrane was crosslinked thoroughly. TPAN@TiO2 membrane has stable flux of DMSO in 24 h filtration at 100 °C. More than 99.5% of rose bengal can be rejected from its solution of DMAc. Abstract: A polyacrylonitrile (PAN)@TiO2 mixed matrix membrane is first fabricated in-situ by the nonsolvent induced phase separation (NIPS) method. Most of the in-situ generated TiO2 nanoparticles are extracted close to the upper layer of the membrane due to their high hydrophilicity, and they strongly interact with the PAN molecules; this enables the resistance of the excessive heat-induced motion of the PAN molecules and prevents structure shrinkage of the pore structures. The thoroughly self-crosslinked PAN@TiO2 membrane (TPAN@TiO2 ) has a strong resistance against solvents, such as N-methylpyrrolidone (NMP), dimethylacetamide (DMAc), and dimethyl sulfoxide (DMSO). All three highly polar organic solvents exhibit 24 h stable permeance at 100 °C with the new membrane. More than 99.5% of Rose Bengal and 88.5% of rhodamine B are rejected from a solution of DMAc. Considering its superior performance, the novel membrane shows promise for application in future desalination processes.