Intercalation of Dyes in Graphene Oxide Thin Films and Membranes.

Autor:	Nordenström A; Department of Physics, Umeå University, S-90187 Umeå, Sweden., Boulanger N; Department of Physics, Umeå University, S-90187 Umeå, Sweden., Iakunkov A; Department of Physics, Umeå University, S-90187 Umeå, Sweden., Baburin I; Theoretische Chemie, Technische Universitat Dresden, Bergstraße 66b, 01062 Dresden, Germany., Klechikov A; Department of Physics and Astronomy, Uppsala University, Uppsala 751 20, Sweden., Vorobiev A; Department of Physics and Astronomy, Uppsala University, Uppsala 751 20, Sweden., Talyzin AV; Department of Physics, Umeå University, S-90187 Umeå, Sweden.
Jazyk:	angličtina
Zdroj:	The journal of physical chemistry. C, Nanomaterials and interfaces [J Phys Chem C Nanomater Interfaces] 2021 Apr 01; Vol. 125 (12), pp. 6877-6885. Date of Electronic Publication: 2021 Mar 23.
DOI:	10.1021/acs.jpcc.1c00327
Abstrakt:	Intercalation of dyes into thin multilayered graphene oxide (GO) films was studied by neutron reflectivity and X-ray diffraction. Methylene blue (MB) penetrates the interlayer space of GO in ethanol solution and remains intercalated after the solvent evaporation, as revealed by the expansion of the interlayer lattice and change in chemical composition. The sorption of MB by thin GO films is found to be significantly stronger compared to the sorption of Crystal violet (CV) and Rose bengal (RB). This effect is attributed to the difference in the geometrical shape of planar MB and essentially nonflat CV and RB molecules. Graphite oxides and restacked GO films are found to exhibit different methylene blue (MB) sorptions. MB sorption by precursor graphite oxide and thin spin-coated films of GO is significantly stronger compared to freestanding micrometer-thick membranes prepared by vacuum filtration. Nevertheless, the sorption capacity of GO membranes is sufficient to remove a significant part of the MB from diluted solutions tested for permeation in several earlier studies. High sorption capacity results in strong modification of the GO structure, which is likely to affect permeation properties of GO membranes. Therefore, MB is not suitable for testing size exclusion effects in the permeation of GO membranes. It is not only hydration or solvation diameter but also the exact geometrical shape of molecules that needs to be taken into account considering size effects for penetration of molecules between GO layers in membrane applications. Competing Interests: The authors declare no competing financial interest. (© 2021 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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