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Title: Sorption of iodide on Cuprite (Cu{sub 2}O)

Abstract

The interactions of iodide ions with cuprite (Cu{sub 2}O) surfaces were studied by combining batch experiments and surface analyses. The evolution of iodide uptake with pH was investigated. The thermodynamical calculations and surface analyses (X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectroscopy, and electrochemistry) were used to show that two different pH-dependent mechanisms are responsible for the accumulation of the iodide species on Cu{sub 2}O. At pH values lower than 6.5, the precipitation of CuI occurs on the cuprite surface, while in more alkaline medium, the iodide adsorption takes place by substituting the surface hydroxyl groups of Cu{sub 2}O. The sorption processes were not affected by a 1000-fold excess of chloride ions, but they were limited to the potential range corresponding to the stability domain of Cu{sub 2}O (i.e., between {minus}10 and +190 mV/ENH at pH 8); thus no accumulation was observed either on metallic copper or on CuO.

Authors:
; ; ;
Publication Date:
Research Org.:
CNRS-Univ. H. Poincare Nancy I, Villers-les-Nancy (FR)
OSTI Identifier:
20080274
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 16; Journal Issue: 10; Other Information: PBD: 16 May 2000; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; IODIDES; COPPER OXIDES; RADIONUCLIDE MIGRATION; ABSORPTION

Citation Formats

Lefevre, G., Walcarius, A., Ehrhardt, J.J., and Bessiere, J. Sorption of iodide on Cuprite (Cu{sub 2}O). United States: N. p., 2000. Web. doi:10.1021/la9903999.
Lefevre, G., Walcarius, A., Ehrhardt, J.J., & Bessiere, J. Sorption of iodide on Cuprite (Cu{sub 2}O). United States. doi:10.1021/la9903999.
Lefevre, G., Walcarius, A., Ehrhardt, J.J., and Bessiere, J. Tue . "Sorption of iodide on Cuprite (Cu{sub 2}O)". United States. doi:10.1021/la9903999.
@article{osti_20080274,
title = {Sorption of iodide on Cuprite (Cu{sub 2}O)},
author = {Lefevre, G. and Walcarius, A. and Ehrhardt, J.J. and Bessiere, J.},
abstractNote = {The interactions of iodide ions with cuprite (Cu{sub 2}O) surfaces were studied by combining batch experiments and surface analyses. The evolution of iodide uptake with pH was investigated. The thermodynamical calculations and surface analyses (X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectroscopy, and electrochemistry) were used to show that two different pH-dependent mechanisms are responsible for the accumulation of the iodide species on Cu{sub 2}O. At pH values lower than 6.5, the precipitation of CuI occurs on the cuprite surface, while in more alkaline medium, the iodide adsorption takes place by substituting the surface hydroxyl groups of Cu{sub 2}O. The sorption processes were not affected by a 1000-fold excess of chloride ions, but they were limited to the potential range corresponding to the stability domain of Cu{sub 2}O (i.e., between {minus}10 and +190 mV/ENH at pH 8); thus no accumulation was observed either on metallic copper or on CuO.},
doi = {10.1021/la9903999},
journal = {Langmuir},
issn = {0743-7463},
number = 10,
volume = 16,
place = {United States},
year = {2000},
month = {5}
}