| ID | 63989 |
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| Author |
Ohkubo, Takahiro
Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University
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Nakayasu, Hiroki
Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University
Takeuchi, Yuki
Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University
Takeyasu, Nobuyuki
Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University
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Kuroda, Yasushige
Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University
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| Abstract | The adsorption of the nitrate ion by the cylindrical pore of single-walled carbon nanotubes (SWCNT) was found to be aided by an acidic adsorbed layer. Adsorbed water in the vicinity of the pore wall can supply protons through ionization, forming the acidic layer, according to Raman spectra and results of solution pH fluctuations caused by ion species adsorption. Such an acidic adsorbed layer leads to surplus adsorption of anionic species where the adsorbed amount of nitrate ions is much larger than that of cations. Also, we could observe the Raman bands being assignable to the symmetrical stretching mode at an extremely highfrequency region for nano-restricted nitrate ions compared to any other bulk phases. The abnormal band shift of adsorbed nitrate ions indicates that the nitrate ions are confined in the pore under the effects of nanoconfinement by the pore and the strong interaction with the acidic layer in the pore. Our results warn that we have to construct the adsorption model of aqueous electrolytes confined in carbon pores by deliberating the acid layer formed by the adsorbed water.
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| Keywords | Proton
Nitrate ion
Adsorption
Confinement
Micropore
Nanospace
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| Note | © 2022 Elsevier Inc. This manuscript version is made available under the CC-BY-NC-ND 4.0 License. http://creativecommons.org/licenses/by-nc-nd/4.0/.
This is the accepted manuscript version. The formal published version is available at [https://doi.org/10.1016/j.jcis.2022.09.070] .
This fulltext is available in Sep. 2024.
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| Published Date | 2023-01
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| Publication Title |
Journal of Colloid and Interface Science
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| Volume | volume629
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| Publisher | Elsevier BV
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| Start Page | 238
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| End Page | 244
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| ISSN | 0021-9797
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| NCID | AA00695804
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| Content Type |
Journal Article
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| language |
English
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| OAI-PMH Set |
岡山大学
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| Copyright Holders | © 2022 Elsevier Inc.
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| File Version | author
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| PubMed ID | |
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| Web of Science KeyUT | |
| Related Url | isVersionOf https://doi.org/10.1016/j.jcis.2022.09.070
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| License | http://creativecommons.org/licenses/by-nc-nd/4.0/
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| Funder Name |
Japan Society for the Promotion of Science
Kurita Water and Environment Foundation
Salt Science Research Foundation
Kyoto Technoscience Center
Society of Iodine Science
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| 助成番号 | 15K05645
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