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Abstract

 

This article in SSSAJ

  1. Vol. 30 No. 5, p. 559-562
     
    Received: June 21, 1965
    Accepted: June 9, 1966


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doi:10.2136/sssaj1966.03615995003000050011x

Surface Chemistry of Hematite: Anion Penetration Effect on Water Adsorption1

  1. J. J. Jurinak2

Abstract

Abstract

The adsorption of water by αFe2O3 (hematite), using high vacuum techniques, was studied. The surface of hematite was treated with phosphate, sulfate, or molybdate and activated at various temperatures prior to adsorption studies. The anion treatment had no apparent effect on the physical adsorption of water. The hematite surface was found to adsorb one water molecule/23-24A2 whereas an OH group on the hematite surface was found to occupy an effective area of 22–23A2. Water adsorption on OH sites is inferred. About 45 to 47% of the oxide surface was found to physically adsorb water. Chemisorbed or OH water was influenced by anion treatment and was related to both the density of the OH population and the mobility of the associated proton. Both water and anion reaction with the surface is discussed.

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