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Multisite proton adsorption modeling at the solid/solution interface of (hydr)oxides: A new approach by T Hiemstra; J.C.M De Wit; W.H Van Riemsdijk is a Chemistry article available to read on EtoBox.

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At the solid/solution interface of metal (hydr)oxides various types of O (H) and OH (H) groups are present, which differ in the number of coordinating metal ions. The a0-pH curves of metal (hydr)oxides are strongly determined by the composition and the relative extent of the various crystal planes of (hydr)oxides. The charging behavior is discussed for gibbsite (AI(OH)3), goethite (FeOOH), hematite (Fe203) , rutile (TiO2), and silica (SiO2). New experimental cro-pH data for goethite and gibbsite are presented. Several important (hydr)oxides exhibit crystal faces which do not develop surface charge over a relatively wide pH range. An uncharged crystal face may be due to the presence of surface groups which are not reactive (inert) in the pH range under consideration, like the 001 face of gibbsite and the 0001 face of hematite, or caused by the presence of two types of interacting charged surface groups of which the charge of one type is fully compensated by the other like at the 100 face of goethite. The charging behavior of silica and the 001 face of gibbsite is determined by one type of reactive surface group with a large ApK for the consecutive protonation steps. The crystal stru

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Author

T Hiemstra; J.C.M De Wit; W.H Van Riemsdijk

Published

1989

Language

EN

Field

Chemistry (Physical Sciences)