X-ray standing wave investigation of the surface structure of selenite anions adsorbed on calcite

Likwan Cheng; Paul F. Lyman; Neil C. Sturchio; Michael J. Bedzyk

doi:10.1016/S0039-6028(97)00167-2

X-ray standing wave investigation of the surface structure of selenite anions adsorbed on calcite

Likwan Cheng, Paul F. Lyman, Neil C. Sturchio, Michael J. Bedzyk^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

The adsorption of selenite ions (SeO^2-₃) from a dilute aqueous solution onto a freshly-cleaved calcite (1014) surface was studied with the X-ray standing wave (XSW) technique. The complex ion SeO^2-₃ is found to selectively adsorb at the CO^2-₃ site via ionic exchange, forming a two-dimensional solid-solution of the form Ca(SeO₃)_x(CO₃)_1-x at the interface. The calcite (1014), (0006) and (1120) Bragg reflections were used to triangulate the Se position with respect to the calcite lattice. The local surface structure at the SeO^2-₃ adsorbate site, derived from the XSW results, is consistent with a model in which the base of the SeO^2-₃ trigonal pyramid aligns with (and replaces) the CO^2-₃ equilateral triangular group. The SeO^2-₃ adsorption saturated at a coverage of 0.02 monolayers. Under identical chemical conditions, selenate (SeO^2-₄) adsorption was inhibited.

Original language	English (US)
Pages (from-to)	L690-L695
Journal	Surface Science
Volume	382
Issue number	1-3
DOIs	https://doi.org/10.1016/S0039-6028(97)00167-2
State	Published - Jun 20 1997

Keywords

Adsorption
CaCO3
Calcite
Low-index single crystal surfaces
SeO
Selenite
Surface structure
X-ray standing waves (XSW)

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/S0039-6028(97)00167-2

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title = "X-ray standing wave investigation of the surface structure of selenite anions adsorbed on calcite",

abstract = "The adsorption of selenite ions (SeO2-3) from a dilute aqueous solution onto a freshly-cleaved calcite (1014) surface was studied with the X-ray standing wave (XSW) technique. The complex ion SeO2-3 is found to selectively adsorb at the CO2-3 site via ionic exchange, forming a two-dimensional solid-solution of the form Ca(SeO3)x(CO3)1-x at the interface. The calcite (1014), (0006) and (1120) Bragg reflections were used to triangulate the Se position with respect to the calcite lattice. The local surface structure at the SeO2-3 adsorbate site, derived from the XSW results, is consistent with a model in which the base of the SeO2-3 trigonal pyramid aligns with (and replaces) the CO2-3 equilateral triangular group. The SeO2-3 adsorption saturated at a coverage of 0.02 monolayers. Under identical chemical conditions, selenate (SeO2-4) adsorption was inhibited.",

keywords = "Adsorption, CaCO3, Calcite, Low-index single crystal surfaces, SeO, Selenite, Surface structure, X-ray standing waves (XSW)",

author = "Likwan Cheng and Lyman, {Paul F.} and Sturchio, {Neil C.} and Bedzyk, {Michael J.}",

note = "Funding Information: This research was supported by the Geoscience and Materials Science Research Programs of the Office of Basic Energy Sciences, U.S. Department of Energy, under contract W-31-109-Eng-38 to Argonne National Laboratory and DOE contract DE-AC02-76CH00016 to the National Synchrotron Light Source at Brookhaven National Labor~ttory, and by the National Science Foundation under contract DMR-9632472 to the Materials Research Center at Northwestern University.",

year = "1997",

month = jun,

day = "20",

doi = "10.1016/S0039-6028(97)00167-2",

language = "English (US)",

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pages = "L690--L695",

journal = "Surface Science",

issn = "0039-6028",

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number = "1-3",

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TY - JOUR

T1 - X-ray standing wave investigation of the surface structure of selenite anions adsorbed on calcite

AU - Cheng, Likwan

AU - Lyman, Paul F.

AU - Sturchio, Neil C.

AU - Bedzyk, Michael J.

N1 - Funding Information: This research was supported by the Geoscience and Materials Science Research Programs of the Office of Basic Energy Sciences, U.S. Department of Energy, under contract W-31-109-Eng-38 to Argonne National Laboratory and DOE contract DE-AC02-76CH00016 to the National Synchrotron Light Source at Brookhaven National Labor~ttory, and by the National Science Foundation under contract DMR-9632472 to the Materials Research Center at Northwestern University.

PY - 1997/6/20

Y1 - 1997/6/20

N2 - The adsorption of selenite ions (SeO2-3) from a dilute aqueous solution onto a freshly-cleaved calcite (1014) surface was studied with the X-ray standing wave (XSW) technique. The complex ion SeO2-3 is found to selectively adsorb at the CO2-3 site via ionic exchange, forming a two-dimensional solid-solution of the form Ca(SeO3)x(CO3)1-x at the interface. The calcite (1014), (0006) and (1120) Bragg reflections were used to triangulate the Se position with respect to the calcite lattice. The local surface structure at the SeO2-3 adsorbate site, derived from the XSW results, is consistent with a model in which the base of the SeO2-3 trigonal pyramid aligns with (and replaces) the CO2-3 equilateral triangular group. The SeO2-3 adsorption saturated at a coverage of 0.02 monolayers. Under identical chemical conditions, selenate (SeO2-4) adsorption was inhibited.

AB - The adsorption of selenite ions (SeO2-3) from a dilute aqueous solution onto a freshly-cleaved calcite (1014) surface was studied with the X-ray standing wave (XSW) technique. The complex ion SeO2-3 is found to selectively adsorb at the CO2-3 site via ionic exchange, forming a two-dimensional solid-solution of the form Ca(SeO3)x(CO3)1-x at the interface. The calcite (1014), (0006) and (1120) Bragg reflections were used to triangulate the Se position with respect to the calcite lattice. The local surface structure at the SeO2-3 adsorbate site, derived from the XSW results, is consistent with a model in which the base of the SeO2-3 trigonal pyramid aligns with (and replaces) the CO2-3 equilateral triangular group. The SeO2-3 adsorption saturated at a coverage of 0.02 monolayers. Under identical chemical conditions, selenate (SeO2-4) adsorption was inhibited.

KW - Adsorption

KW - CaCO3

KW - Calcite

KW - Low-index single crystal surfaces

KW - SeO

KW - Selenite

KW - Surface structure

KW - X-ray standing waves (XSW)

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DO - 10.1016/S0039-6028(97)00167-2

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SN - 0039-6028

VL - 382

SP - L690-L695

JO - Surface Science

JF - Surface Science

IS - 1-3

ER -

X-ray standing wave investigation of the surface structure of selenite anions adsorbed on calcite

Abstract

Keywords

ASJC Scopus subject areas

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