XAFS study of Cu(II) at the water-goethite (alpha-FeOOH) interface
(1997) In Journal de Physique IV 7. p.819-820- Abstract
- Cu(II) complexation at the water-goethite (alpha-FeOOH) interface was studied by XAFS, potentiometry, and sorption experiments. Thermodynamic data indicate that the initial Cu(II) sorption is not accompanied by release of a H+. As pH is raised, hydrolysis occurs, and a maximum of two H+ are released per sorbed ion. Sorption experiments also show that Cu(II) complexation is insensitive to variation in ionic strength, indicating inner-sphere Cu complexes. The Cu K-edge XAFS suggest that the Cu(II) surface complexes are Jahn-Teller distorted with an equatorial plane of oxygens at approximately 1.95 Angstrom. At pH 5, no 2nd coordination shell is observed. However, at pH 8 there is a well-defined 2nd shell which is best modeled with two Cu... (More)
- Cu(II) complexation at the water-goethite (alpha-FeOOH) interface was studied by XAFS, potentiometry, and sorption experiments. Thermodynamic data indicate that the initial Cu(II) sorption is not accompanied by release of a H+. As pH is raised, hydrolysis occurs, and a maximum of two H+ are released per sorbed ion. Sorption experiments also show that Cu(II) complexation is insensitive to variation in ionic strength, indicating inner-sphere Cu complexes. The Cu K-edge XAFS suggest that the Cu(II) surface complexes are Jahn-Teller distorted with an equatorial plane of oxygens at approximately 1.95 Angstrom. At pH 5, no 2nd coordination shell is observed. However, at pH 8 there is a well-defined 2nd shell which is best modeled with two Cu atoms at 2.96 Angstrom. The appearance of a 2nd coordination shell at higher pH is attributed to the formation of hydroxo-bridged Cu(II) surface polymers. (Less)
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https://lup.lub.lu.se/record/4332664
- author
- Bochatay, L. ; Persson, Per LU ; Lovgren, L. and Brown, G. E.
- publishing date
- 1997
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal de Physique IV
- volume
- 7
- pages
- 819 - 820
- publisher
- EDP Sciences
- ISSN
- 1155-4339
- DOI
- 10.1051/jp4:1997246
- language
- English
- LU publication?
- no
- additional info
- C2
- id
- a68f4934-ac70-4910-aa5c-88a6e7b47268 (old id 4332664)
- date added to LUP
- 2016-04-01 12:17:26
- date last changed
- 2020-01-16 10:58:06
@article{a68f4934-ac70-4910-aa5c-88a6e7b47268, abstract = {{Cu(II) complexation at the water-goethite (alpha-FeOOH) interface was studied by XAFS, potentiometry, and sorption experiments. Thermodynamic data indicate that the initial Cu(II) sorption is not accompanied by release of a H+. As pH is raised, hydrolysis occurs, and a maximum of two H+ are released per sorbed ion. Sorption experiments also show that Cu(II) complexation is insensitive to variation in ionic strength, indicating inner-sphere Cu complexes. The Cu K-edge XAFS suggest that the Cu(II) surface complexes are Jahn-Teller distorted with an equatorial plane of oxygens at approximately 1.95 Angstrom. At pH 5, no 2nd coordination shell is observed. However, at pH 8 there is a well-defined 2nd shell which is best modeled with two Cu atoms at 2.96 Angstrom. The appearance of a 2nd coordination shell at higher pH is attributed to the formation of hydroxo-bridged Cu(II) surface polymers.}}, author = {{Bochatay, L. and Persson, Per and Lovgren, L. and Brown, G. E.}}, issn = {{1155-4339}}, language = {{eng}}, pages = {{819--820}}, publisher = {{EDP Sciences}}, series = {{Journal de Physique IV}}, title = {{XAFS study of Cu(II) at the water-goethite (alpha-FeOOH) interface}}, url = {{http://dx.doi.org/10.1051/jp4:1997246}}, doi = {{10.1051/jp4:1997246}}, volume = {{7}}, year = {{1997}}, }