Incorporation of Monovalent Cations in Sulfate Green Rust

被引：29

作者：

Christiansen, B. C. ^{[1
]}

Dideriksen, K. ^{[1
]}

Katz, A. ^{[1
]}

Nedel, S. ^{[1
]}

Bovet, N. ^{[1
]}

Sorensen, H. O. ^{[1
]}

Frandsen, C. ^{[2
]}

Gundlach, C. ^{[2
]}

Andersson, M. P. ^{[1
]}

Stipp, S. L. S. ^{[1
]}

机构：

[1] Univ Copenhagen, Dept Chem, Nanosci Ctr, DK-2100 Copenhagen, Denmark

[2] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark

来源：

INORGANIC CHEMISTRY | 2014年 / 53卷 / 17期

基金：

英国工程与自然科学研究理事会;

关键词：

INFRARED-SPECTRA; FREE-ENERGY; REDUCTION; SPECTROSCOPY; HYDROXIDE; CORROSION; TRANSFORMATION; MECHANISMS; PRODUCTS; MINERALS;

D O I：

10.1021/ic500495a

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Green rust is a naturally occurring layered mixed-valent ferrous-ferric hydroxide, which can react with a range of redox-active compounds. Sulfate-bearing green rust is generally thought to have interlayers composed of sulfate and water. Here, we provide evidence that the interlayers also contain monovalent cations, using X-ray photoelectron spectroscopy and synchrotron X-ray scattering. For material synthesized with Na+, K+, Rb+, or Cs+, interlayer thickness derived from basal plane spacings correlates with the radius of the monovalent cation. In addition, sequential washing of the materials with water showed that Na+ and K+ were structurally fixed in the interlayer, whereas Rb+ and Cs+ could be removed, resulting in a decrease in the basal layer spacing. The incorporation of cations in the interlayer opens up new possibilities for the use of sulfate green rust for exchange reactions with both anions and cations: e.g., radioactive Cs.

引用

页码：8887 / 8894

页数：8

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