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Nanoporous metal–polymer composite membranes for organics separations and catalysis

Published online by Cambridge University Press:  20 August 2020

Michael J. Detisch
Affiliation:
Department of Chemical & Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
Thomas John Balk
Affiliation:
Department of Chemical & Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
Mariah Bezold
Affiliation:
Department of Chemical & Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
Dibakar Bhattacharyya*
Affiliation:
Department of Chemical & Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, USA
*
a)Address all correspondence to this author. e-mail: db@uky.edu
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Abstract

Metallic thin-film composite membranes are produced by sputtering metal films onto commercial polymer membranes. The separations capability of the membrane substrate is enhanced with the addition of a 10 nm Ta film. The addition of a tantalum layer decreases the molecular weight cutoff of the membrane from 70 kDa dextran (19 nm) to below 5 kDa (6 nm). Water flux drops from 168 LMH/bar (LMH: liters/meters2/hour) (polymer support) to 8.8 LMH/bar (Ta composite). A nanoporous layer is also added to the surface through Mg/Pd film deposition and dealloying. The resulting nanoporous Pd is a promising catalyst with a ligament size of 4.1 ± 0.9 nm. The composite membrane's ability to treat water contaminated with chlorinated organic compounds (COCs) is determined. When pressurized with hydrogen gas, the nanoporous Pd composite removes over 70% of PCB-1, a model COC, with one pass. These nanostructured films can be incorporated onto membrane supports enabling diverse reactions and separations.

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Copyright
Copyright © Materials Research Society 2020

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