Isotope effect on water adsorption on hydrophobic carbons of different nanoporosities. (August 2017)

• Record Type: Journal Article
• Authors: Ono, Yuji; Futamura, Ryusuke; Hattori, Yoshiyuki; Utsumi, Shigenori; Sakai, Toshio; Kaneko, Katsumi
• Is Part Of: Carbon. Volume 119(2017)
• Page Start: 251
• Page End: 256
• Publication Date: 2017-08
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2017.04.047
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: The adsorption isotherms of H2 O and D2 O on pitch-based activated carbon fibers (ACFs) of different pore widths from 0.6 to 1.5 nm were measured at 298 K. Briefly speaking, the D2 O adsorption isotherms are close to the H2 O adsorption isotherms. However, we observed an evident difference in the rising and desorption relative pressures for the H2 O and D2 O adsorption isotherms. The D2 O adsorption rises at a higher relative pressure than the H2 O adsorption. Correspondingly the D2 O desorption occurs at a higher relative pressure than the H2 O desorption. Detailed comparison of the H2 O and D2 O adsorption isotherms confirmed a reproducible difference over the whole relative pressure range. The different adsorption behavior of H2 O and D2 O in the hydrophobic micropores is discussed with the relevance to the difference in the hydrogen bonding of H2 O and D2 O. Graphical abstract: