吸附
无机化学
化学
水溶液
离子
碳纳米管
拉曼光谱
硝酸盐
电解质
图层(电子)
碳纤维
化学工程
材料科学
物理化学
纳米技术
有机化学
复合材料
工程类
物理
光学
复合数
电极
作者
Takahiro Ohkubo,Hiroki Nakayasu,Yuki Takeuchi,Nobuyuki Takeyasu,Yasushige Kuroda
标识
DOI:10.1016/j.jcis.2022.09.070
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 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 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.
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