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- Publisher Website: 10.1021/acsestengg.1c00418
- Scopus: eid_2-s2.0-85127588831
- WOS: WOS:000827817800001
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Article: Deciphering the role of amine concentration on polyamide formation toward enhanced RO performance
Title | Deciphering the role of amine concentration on polyamide formation toward enhanced RO performance |
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Authors | |
Issue Date | 2022 |
Publisher | American Chemical Society. |
Citation | ACS ES&T Engineering, 2022, v. 2 n. 5, p. 903-912 How to Cite? |
Abstract | Polyamide surface morphology and its underneath nanosized voids have crucial influence on the separation performance of thin film composite (TFC) polyamide reverse osmosis membranes. Although there have been numerous studies reporting the impact of amine monomer concentration on polyamide formation and membrane performance, the observations and interpretations in the existing literature remain controversial. In this study, we performed interfacial polymerization (IP) of polyamide films over a wide range of m-phenylenediamine (MPD) concentration (0.05-8.0 w/w %). For the first time, we demonstrate that the water permeance of the resultant TFC membranes is governed by the competing effects of (1) promoted polyamide film growth for forming thicker polyamide films and (2) improved nanofoaming effect that results in more extensive nanovoids at higher MPD concentrations. To dissect these competing mechanisms, we further adopted a free-interface IP strategy to suppress the nanofoaming effect. The corresponding polyamide nanofilms had negligible nanovoids and monotonously increased film thickness, leading to decreased water permeance at high MPD concentrations. In contrast, the conventional TFC membranes exhibited optimal water permeance at the intermediate MPD concentration of 2.0 w/w %, which results from the trade-off between improved nanovoid formation (which promotes higher permeance) and increased film growth (which limits permeance). On the other hand, the better film growth at greater MPD concentration was generally beneficial for achieving better membrane rejection. The current study unveils the fundamental chemistry-morphology-performance relationship of TFC polyamide membranes and provides important implications on their synthesis and environmental applications. |
Persistent Identifier | http://hdl.handle.net/10722/315138 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Peng, L | - |
dc.contributor.author | Gan, Q | - |
dc.contributor.author | Yang, Z | - |
dc.contributor.author | Wang, L | - |
dc.contributor.author | Sun, P | - |
dc.contributor.author | Guo, H | - |
dc.contributor.author | Park, H | - |
dc.contributor.author | Tang, C | - |
dc.date.accessioned | 2022-08-05T09:40:52Z | - |
dc.date.available | 2022-08-05T09:40:52Z | - |
dc.date.issued | 2022 | - |
dc.identifier.citation | ACS ES&T Engineering, 2022, v. 2 n. 5, p. 903-912 | - |
dc.identifier.uri | http://hdl.handle.net/10722/315138 | - |
dc.description.abstract | Polyamide surface morphology and its underneath nanosized voids have crucial influence on the separation performance of thin film composite (TFC) polyamide reverse osmosis membranes. Although there have been numerous studies reporting the impact of amine monomer concentration on polyamide formation and membrane performance, the observations and interpretations in the existing literature remain controversial. In this study, we performed interfacial polymerization (IP) of polyamide films over a wide range of m-phenylenediamine (MPD) concentration (0.05-8.0 w/w %). For the first time, we demonstrate that the water permeance of the resultant TFC membranes is governed by the competing effects of (1) promoted polyamide film growth for forming thicker polyamide films and (2) improved nanofoaming effect that results in more extensive nanovoids at higher MPD concentrations. To dissect these competing mechanisms, we further adopted a free-interface IP strategy to suppress the nanofoaming effect. The corresponding polyamide nanofilms had negligible nanovoids and monotonously increased film thickness, leading to decreased water permeance at high MPD concentrations. In contrast, the conventional TFC membranes exhibited optimal water permeance at the intermediate MPD concentration of 2.0 w/w %, which results from the trade-off between improved nanovoid formation (which promotes higher permeance) and increased film growth (which limits permeance). On the other hand, the better film growth at greater MPD concentration was generally beneficial for achieving better membrane rejection. The current study unveils the fundamental chemistry-morphology-performance relationship of TFC polyamide membranes and provides important implications on their synthesis and environmental applications. | - |
dc.language | eng | - |
dc.publisher | American Chemical Society. | - |
dc.relation.ispartof | ACS ES&T Engineering | - |
dc.rights | This document is the Accepted Manuscript version of a Published Work that appeared in final form in [JournalTitle], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html]. | - |
dc.title | Deciphering the role of amine concentration on polyamide formation toward enhanced RO performance | - |
dc.type | Article | - |
dc.identifier.email | Peng, L: penglu@HKUCC-COM.hku.hk | - |
dc.identifier.email | Yang, Z: zheyang8@hku.hk | - |
dc.identifier.email | Guo, H: guohao7@hku.hk | - |
dc.identifier.email | Tang, C: tangc@hku.hk | - |
dc.identifier.authority | Yang, Z=rp02847 | - |
dc.identifier.authority | Guo, H=rp02772 | - |
dc.identifier.authority | Tang, C=rp01765 | - |
dc.identifier.doi | 10.1021/acsestengg.1c00418 | - |
dc.identifier.scopus | eid_2-s2.0-85127588831 | - |
dc.identifier.hkuros | 334775 | - |
dc.identifier.volume | 2 | - |
dc.identifier.issue | 5 | - |
dc.identifier.spage | 903 | - |
dc.identifier.epage | 912 | - |
dc.identifier.isi | WOS:000827817800001 | - |