Laser-induced graphene Janus membrane for electrothermal membrane distillation
To improve the energy efficiency of membrane distillation (MD), localized heating of the feed-membrane interface is advantageous relative to heating of the bulk feed. This motivated the current study, which targeted at developing a simple two-step way of fabricating Laser-Induced Graphene (LIG) Janu...
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sg-ntu-dr.10356-1633932022-12-05T07:10:10Z Laser-induced graphene Janus membrane for electrothermal membrane distillation Tan, Yong Zen Kapavarapu, M. S. R. Sridhar Oor, Jia Zheng Ong, Chi Siang Chew, Jia Wei School of Chemical and Biomedical Engineering Singapore Membrane Technology Centre Engineering::Chemical engineering Laser-Induced Graphene Surface Modification To improve the energy efficiency of membrane distillation (MD), localized heating of the feed-membrane interface is advantageous relative to heating of the bulk feed. This motivated the current study, which targeted at developing a simple two-step way of fabricating Laser-Induced Graphene (LIG) Janus membrane for electrothermal membrane distillation. Specifically, the Janus membrane had an electrically conductive graphene side and a polydimethylsiloxane (PDMS) coated polyethersulfone (PES) side. The PES membrane was first coated with PDMS in limonene (a green solvent) and the active layer exposed to low-powered laser. Joule heating was carried out on the LIG surface by connecting two electrodes to the opposite ends of the LIG surface and providing power with an alternating current power supply at regular household frequency. This Janus membrane can be heated on the LIG surface while insulated from heat loss on the PDMS-coated PES surface, resulting in a marked improvement in the MD performance. Relative to pre-heated feed at the same power input, Joule heating of the Janus membranes gave a flux increase of up to 119.5%, specific heating energy decrease of up to 53.9% and single-pass heat utilization efficiency increase of up to 119.5%, while maintaining excellent material stability. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) This study was supported by A*STAR (Singapore) Advanced Manufacturing and Engineering (AME) under its Pharma Innovation Programme Singapore (PIPS) (A20B3a0070); A*STAR (Singapore) Advanced Manufacturing and Engineering (AME) under its Individual Research Grant (IRG) program (A2083c0049); the Singapore Ministry of Education Academic Research Tier 1 Grant (2019-T1-002-065; RG100/ 19) and the Singapore Ministry of Education Academic Research Tier 2 Grant (MOE-MOET2EP10120-0001). 2022-12-05T07:10:10Z 2022-12-05T07:10:10Z 2022 Journal Article Tan, Y. Z., Kapavarapu, M. S. R. S., Oor, J. Z., Ong, C. S. & Chew, J. W. (2022). Laser-induced graphene Janus membrane for electrothermal membrane distillation. Desalination, 540, 115994-. https://dx.doi.org/10.1016/j.desal.2022.115994 0011-9164 https://hdl.handle.net/10356/163393 10.1016/j.desal.2022.115994 2-s2.0-85134964731 540 115994 en A20B3a0070 A2083c0049 2019-T1-002-065 RG100/19 MOE-MOET2EP10120-0001 Desalination © 2022 Elsevier B.V. All rights reserved. |
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Engineering::Chemical engineering Laser-Induced Graphene Surface Modification Tan, Yong Zen Kapavarapu, M. S. R. Sridhar Oor, Jia Zheng Ong, Chi Siang Chew, Jia Wei Laser-induced graphene Janus membrane for electrothermal membrane distillation |
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To improve the energy efficiency of membrane distillation (MD), localized heating of the feed-membrane interface is advantageous relative to heating of the bulk feed. This motivated the current study, which targeted at developing a simple two-step way of fabricating Laser-Induced Graphene (LIG) Janus membrane for electrothermal membrane distillation. Specifically, the Janus membrane had an electrically conductive graphene side and a polydimethylsiloxane (PDMS) coated polyethersulfone (PES) side. The PES membrane was first coated with PDMS in limonene (a green solvent) and the active layer exposed to low-powered laser. Joule heating was carried out on the LIG surface by connecting two electrodes to the opposite ends of the LIG surface and providing power with an alternating current power supply at regular household frequency. This Janus membrane can be heated on the LIG surface while insulated from heat loss on the PDMS-coated PES surface, resulting in a marked improvement in the MD performance. Relative to pre-heated feed at the same power input, Joule heating of the Janus membranes gave a flux increase of up to 119.5%, specific heating energy decrease of up to 53.9% and single-pass heat utilization efficiency increase of up to 119.5%, while maintaining excellent material stability. |
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School of Chemical and Biomedical Engineering |
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School of Chemical and Biomedical Engineering Tan, Yong Zen Kapavarapu, M. S. R. Sridhar Oor, Jia Zheng Ong, Chi Siang Chew, Jia Wei |
format |
Article |
author |
Tan, Yong Zen Kapavarapu, M. S. R. Sridhar Oor, Jia Zheng Ong, Chi Siang Chew, Jia Wei |
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Tan, Yong Zen |
title |
Laser-induced graphene Janus membrane for electrothermal membrane distillation |
title_short |
Laser-induced graphene Janus membrane for electrothermal membrane distillation |
title_full |
Laser-induced graphene Janus membrane for electrothermal membrane distillation |
title_fullStr |
Laser-induced graphene Janus membrane for electrothermal membrane distillation |
title_full_unstemmed |
Laser-induced graphene Janus membrane for electrothermal membrane distillation |
title_sort |
laser-induced graphene janus membrane for electrothermal membrane distillation |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/163393 |
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1751548520994701312 |