Acidic layer-enhanced nanoconfinement of anions in cylindrical pore of single-walled carbon nanotube

被引：2
作者：
Ohkubo, Takahiro [1 ]
Nakayasu, Hiroki [1 ]
Takeuchi, Yuki [1 ]
Takeyasu, Nobuyuki [1 ]
Kuroda, Yasushige [1 ]
机构：
[1] Okayama Univ, Grad Sch Nat Sci & Technol, Dept Chem, 3-1-1 Tsushimanaka,Kita Ku, Okayama 7008530, Japan
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2023年 / 629卷
关键词：
Proton; Nitrate ion; Adsorption; Confinement; Micropore; Nanospace; WATER; ADSORPTION; ION; NANOSPACE; PHASE; TEMPERATURE; SIMULATION; TRANSPORT; SURFACES; HYDROGEN;
D O I：
10.1016/j.jcis.2022.09.070
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 adsorp-tion 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 high-frequency 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. (C) 2022 Elsevier Inc. All rights reserved.
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收藏
页码：238 / 244
页数：7
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