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|Title:||Thin film composite membranes on ceramic for pervaporation dehydration of isopropanol|
|Authors:||Shi, G.M. |
Thin film composite
|Source:||Shi, G.M., Chung, T.-S. (2013-12-05). Thin film composite membranes on ceramic for pervaporation dehydration of isopropanol. Journal of Membrane Science 448 : 34-43. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2013.07.049|
|Abstract:||We have developed novel thin film composite (TFC) membranes on ceramic substrates (referred as ceramic TFC membranes thereafter) for pervaporation dehydration of isopropanol (IPA) by using interfacial polymerization (IP) of m-phenylenediamine (MPD) and trymesoylchoride (TMC) to create ultra-thin polyamide films as selective layers. Prior to IP, a gutter layer of polydopamine (PDA) or polyethyleneimine (PEI) was deposited on α-alumina ceramic surfaces to improve the adhesion of polyamide thin films onto the ceramic. It was found that the PEI-coated ceramic substrate provided better adhesion with the polyamide thin film than the original and PDA-coated ones owing to its smoother surface. Polydimethylsiloxane (PDMS) was employed to seal defects on ceramic TFC membranes and significantly improved the performance of pervaporation dehydration of IPA with a flux of 6.05kg/m2h and a separation factor 1396 at 80°C. Moreover, the developed ceramic TFC membrane shows high stability after 120h operation. Positron annihilation spectroscopy (PAS) analyses revealed that the newly developed membrane has an ultrathin polyamide layer of 79nm and a PDMS coating of ~26nm. This study demonstrates the promising application of ceramic TFC membranes for pervaporation dehydration of organic solutions. © 2013 Elsevier B.V.|
|Source Title:||Journal of Membrane Science|
|Appears in Collections:||Staff Publications|
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