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XAFS study of Cu model compounds and Cu^2+^sorption products on amorphous SiO~2~, γ-Al~2~O~3~, and anatase by Sing-Foong Cheah; Gordon E. Brown; George A. Parks is a Earth and Planetary Sciences article available to read on EtoBox.

What is XAFS study of Cu model compounds and Cu^2+^sorption products on amorphous SiO~2~, γ-Al~2~O~3~, and anatase about?

The primary objective of this study is to determine the effect of substrate type on the coordination environments of Cu 2+ adsorbed on amorphous SiO 2 , γ-Al 2 O 3 , and anatase at a surface coverage of approximately 1 μmol/m 2 . We also collected X-ray absorption fine structure (XAFS) data for several Cu 2+ -containing model compounds, including tenorite ( VI CuO), spertiniite [ VI Cu(OH) 2 ], dioptase ( VI CuSiO 2 •H 2 O), shattuckite [ VI Cu 5 (SiO 3 ) 4 (OH) 2 ], chrysocolla [ VI (Cu,Al) 2 H 2 Si 2 O 5 (OH) 4 •nH 2 O], and Cu 2+ acetate monohydrate [ VI Cu(CH 3 CO 2 ) 2 •H 2 O], for comparison with the sorption sample data. Detailed analysis of these model compounds indicates that the bonding of second neighbors surrounding a central Cu absorber determines whether these second neighbors can be detected by XAFS. The XAFS results of Cu 2+ sorption samples are consistent with the presence of Jahn-Teller distorted Cu 2+ (O,OH) 6 octahedra, with four equatorial Cu-O bonds (1.95 Å) and two longer axial bonds; the axial Cu-O bonds are difficult to characterize quantitatively by XAFS spectroscopy. Cu 2+ sorbed on amorphous SiO 2 was found to have Cu second and third neighbors at 2.95 Å

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Author

Sing-Foong Cheah; Gordon E. Brown; George A. Parks

Publisher

Mineralogical Society of America

Published

2000

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)