Water adsorption on carbon - A review

Water adsorption on carbonaceous materials has been studied increasingly in the recent years, not only because of its impact on many industrial processes, but also motivated by a desire to understand, at a fundamental level, the distinctive character of directional interactions between water molecul...

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Published in:Advances in colloid and interface science 2017-12, Vol.250, p.64-78
Main Authors: Liu, Lumeng, Tan, Shiliang (Johnathan), Horikawa, Toshihide, Do, D.D., Nicholson, D., Liu, Junjie
Format: Article
Language:English
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Summary:Water adsorption on carbonaceous materials has been studied increasingly in the recent years, not only because of its impact on many industrial processes, but also motivated by a desire to understand, at a fundamental level, the distinctive character of directional interactions between water molecules, and between water molecules and other polar groups, such as the functional groups (FGs) at the surfaces of graphene layers. This paper presents an extensive review of recent experimental and theoretical work on water adsorption on various carbonaceous materials, with the aim of gaining a better understanding of how water adsorption in carbonaceous materials relates to the concentration of FGs, their topology (arrangement of the groups) and the structure of the confined space in porous carbons. Arising from this review we are able to propose mechanisms for water adsorption in carbonaceous materials as the adsorbate density increases. The intricate interplay between the roles of FGs and confinement makes adsorption of water on carbon materials very different from that of other simple molecules. [Display omitted] •Critical assessment of experimental and computer simulation works on water adsorption in carbon•Identification of the critical variables: the functional group, porous structure, and the temperature•The proposed sequence of water adsorption: Water-strong site complex – Cluster – Agglomerate of clusters – Condensate•Proposal of a generic mechanism for water adsorption in different forms of carbon
ISSN:0001-8686
1873-3727
DOI:10.1016/j.cis.2017.10.002