Water-polyamide chemical interplay in desalination membranes explored by ambient pressure X-ray photoelectron spectroscopy
(2020) In Physical Chemistry Chemical Physics 22(27). p.15658-15663- Abstract
- Reverse osmosis using aromatic polyamide membranes is currently the most important technology for seawater desalination. The performance of reverse osmosis membranes is highly dependent on the interplay of their surface chemical groups with water and water contaminants. In order to better understand the underlying mechanisms of these membranes, we study ultrathin polyamide films that chemically resemble reverse osmosis membranes, using ambient pressure X-ray photoelectron spectroscopy. This technique can identify the functional groups at the membrane–water interface and allows monitoring of small shifts in the electron binding energy that indicate interaction with water. We observe deprotonation of free acid groups and formation of a... (More)
- Reverse osmosis using aromatic polyamide membranes is currently the most important technology for seawater desalination. The performance of reverse osmosis membranes is highly dependent on the interplay of their surface chemical groups with water and water contaminants. In order to better understand the underlying mechanisms of these membranes, we study ultrathin polyamide films that chemically resemble reverse osmosis membranes, using ambient pressure X-ray photoelectron spectroscopy. This technique can identify the functional groups at the membrane–water interface and allows monitoring of small shifts in the electron binding energy that indicate interaction with water. We observe deprotonation of free acid groups and formation of a ‘water complex’ with nitrogen groups in the polymer upon exposure of the membrane to water vapour. The chemical changes are reversed when water is removed from the membrane. While the correlation between functional groups and water uptake is an established one, this experiment serves to understand the nature of their chemical interaction, and opens up possibilities for tailoring future materials to specific requirements. (Less)
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- author
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- in
- Physical Chemistry Chemical Physics
- volume
- 22
- issue
- 27
- pages
- 6 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- scopus:85088239433
- ISSN
- 1463-9084
- DOI
- 10.1039/d0cp01842b
- language
- English
- LU publication?
- no
- id
- 1a156862-3d18-426a-a9b0-cd7c1a89c537
- date added to LUP
- 2024-04-15 10:27:40
- date last changed
- 2024-04-16 04:01:47
@article{1a156862-3d18-426a-a9b0-cd7c1a89c537,
abstract = {{Reverse osmosis using aromatic polyamide membranes is currently the most important technology for seawater desalination. The performance of reverse osmosis membranes is highly dependent on the interplay of their surface chemical groups with water and water contaminants. In order to better understand the underlying mechanisms of these membranes, we study ultrathin polyamide films that chemically resemble reverse osmosis membranes, using ambient pressure X-ray photoelectron spectroscopy. This technique can identify the functional groups at the membrane–water interface and allows monitoring of small shifts in the electron binding energy that indicate interaction with water. We observe deprotonation of free acid groups and formation of a ‘water complex’ with nitrogen groups in the polymer upon exposure of the membrane to water vapour. The chemical changes are reversed when water is removed from the membrane. While the correlation between functional groups and water uptake is an established one, this experiment serves to understand the nature of their chemical interaction, and opens up possibilities for tailoring future materials to specific requirements.}},
author = {{Gericke, Sabrina M. and Mulhearn, William D. and Goodacre, Dana E. and Raso, Joseph and Miller, Daniel J. and Carver, Lauryn and Nemšák, Slavomír and Karslioǧlu, Osman and Trotochaud, Lena and Bluhm, Hendrik and Stafford, Christopher M. and Buechner, Christin}},
issn = {{1463-9084}},
language = {{eng}},
number = {{27}},
pages = {{15658--15663}},
publisher = {{Royal Society of Chemistry}},
series = {{Physical Chemistry Chemical Physics}},
title = {{Water-polyamide chemical interplay in desalination membranes explored by ambient pressure X-ray photoelectron spectroscopy}},
url = {{http://dx.doi.org/10.1039/d0cp01842b}},
doi = {{10.1039/d0cp01842b}},
volume = {{22}},
year = {{2020}},
}