Interactions of Selenate with Copper(I) Oxide Particles
| Autor: | Devoy J, Jacques Bessière, Alain Walcarius |
|---|---|
| Přispěvatelé: | Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (LCPME), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Cuprite
Copper(I) oxide Inorganic chemistry chemistry.chemical_element 010501 environmental sciences 01 natural sciences Selenate Redox chemistry.chemical_compound Adsorption [CHIM.ANAL]Chemical Sciences/Analytical chemistry Electrochemistry General Materials Science Dissolution Spectroscopy 0105 earth and related environmental sciences Aqueous solution 04 agricultural and veterinary sciences Surfaces and Interfaces Condensed Matter Physics Copper chemistry visual_art 040103 agronomy & agriculture visual_art.visual_art_medium 0401 agriculture forestry and fisheries |
| Zdroj: | Langmuir Langmuir, American Chemical Society, 2004, 20 (15), pp.6335-6343. ⟨10.1021/la0496136⟩ |
| ISSN: | 0743-7463 1520-5827 |
| Popis: | International audience; The chemical mechanisms responsible for the immobilization of selenate (SeO42-) from aqueous solutions on cuprite (Cu2O) particles were determined from batch experiments. This was achieved by performing both solution-phase analyses and characterization of solid particles by X-ray photoelectron spectroscopy and transmission electron microscopy techniques, after equilibration of cuprite particles with selenate-containing solutions at various pH values, solid-to-solution ratios, and ionic strengths. Two distinct mechanisms have been pointed out. In the acidic medium, where the acid-catalyzed dissolution of cuprite into CuI species occurs, the immobilization of selenate implies a redox reaction with transient CuI leading to the precipitation of copper(II) selenite, CuSeO3. In the absence of protons added in the medium, Cu2O is chemically stable and immobilization of SeO42- is essentially due to adsorption in the form of an outer-sphere surface complex. The uptake level of selenate by Cu2O is markedly lower than that observed for selenite species in the same conditions. |
| Databáze: | OpenAIRE |
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