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Thin-film composite crosslinked polythiosemicarbazide membranes for organic solvent nanofiltration (OSN) |
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| Affiliation: | 1. Nanyang Environment and Water Research Institute, Interdisciplinary Graduate School, Nanyang Technological University, Singapore;2. Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore;3. School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore;4. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. Centre for Surface Chemistry and Catalysis, KU Leuven, Kasteelpark Arenberg 23, PO Box 2461, 3001 Leuven, Belgium;2. Polymer Chemistry and Materials, KU Leuven, Celestijnenlaan 200F, PO Box 2404, 3001 Leuven, Belgium;1. Department of Chemical & Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore;2. Advanced Materials and Systems Research, BASF SE, RAP/OUB - B1, 67056 Ludwigshafen, Germany;3. Performance Materials, BASF SE, G-PMF/SU-F206, 67056 Ludwigshafen, Germany |
| Abstract: | In this work we report a new class of solvent stable thin-film composite (TFC) membrane fabricated on crosslinked polythiosemicarbazide (PTSC) as substrate that exhibits superior stability compared with other solvent stable polymeric membranes reported up to now. Integrally skinned asymmetric PTSC membranes were prepared by the phase inversion process and crosslinked with an aromatic bifunctional crosslinker to improve the solvent stability. TFC membranes were obtained via interfacial polymerization using trimesoyl chloride (TMC) and diaminopiperazine (DAP) monomers. The membranes were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and contact angle measurement.The membranes exhibited high fluxes toward solvents like tetrahydrofuran (THF), dimethylformamide (DMF) and dimethylsulfoxide (DMSO) ranging around 20 L/m2 h at 5 bar with a molecular weight cut off (MWCO) of around 1000 g/mol. The PTSC-based thin-film composite membranes are very stable toward polar aprotic solvents and they have potential applications in the petrochemical and pharmaceutical industry. |
| Keywords: | Organic solvent nanofiltration Polythiosemicarbazide Diaminopiperazine Trimesoyl chloride Interfacial polymerization Thin-film composite membranes |
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