The interaction of metal oxide surfaces with complexing agents dissolved in water

✍ Scribed by M.A. Blesa; A.D. Weisz; P.J. Morando; J.A. Salfity; G.E. Magaz; A.E. Regazzoni

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 308 KB
• Volume: 196
• Category: Article
• ISSN: 0010-8545
• DOI: 10.1016/s0010-8545(99)00005-3

✦ Synopsis

Upon exposure to liquid water or to aqueous solutions, the surfaces of metal oxide particles or films undergo a series of chemical reactions that are dictated to a large extent by the chemistry of the metal ions involved. These reactions involve surface hydroxylation and hydration (dissociative and non-dissociative water chemisorption), chemisorption of solutes and charge transfer reactions. The present review focuses on the chemisorption of anions, which is a surface complexation reaction. In simple cases, chemical equilibria may be written, and quantified by heterogeneous stability constants that resemble the analogous homogeneous ones. This approach has been practiced for more than 20 years, and in selected cases values are available for a discussion of stability trends, even though the stability constant