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Competitive sorption of Ni and Zn at the aluminum oxide/water interface: an XAFS study
Trace metals (e.g. Ni, Zn) leached from industrial and agricultural processes are often simultaneously present in contaminated soils and sediments. Their mobility, bioavailability, and ecotoxicity are affected by sorption and cosorption at mineral/solution interfaces. Cosorption of trace metals has...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer International Publishing
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5869350/ https://www.ncbi.nlm.nih.gov/pubmed/29589126 http://dx.doi.org/10.1186/s12932-018-0054-7 |
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author | Gou, Wenxian Siebecker, Matthew G. Wang, Zimeng Li, Wei |
author_facet | Gou, Wenxian Siebecker, Matthew G. Wang, Zimeng Li, Wei |
author_sort | Gou, Wenxian |
collection | PubMed |
description | Trace metals (e.g. Ni, Zn) leached from industrial and agricultural processes are often simultaneously present in contaminated soils and sediments. Their mobility, bioavailability, and ecotoxicity are affected by sorption and cosorption at mineral/solution interfaces. Cosorption of trace metals has been investigated at the macroscopic level, but there is not a clear understanding of the molecular-scale cosorption processes due to lack of spectroscopic information. In this study, Ni and Zn cosorption to aluminum oxides (γ-Al(2)O(3)) in binary-sorbate systems were compared to their sorption in single-sorbate systems as a function of pH using both macroscopic batch experiments and synchrotron-based X-ray absorption fine structure spectroscopy. At pH 6.0, Ni and Zn were sorbed as inner-sphere surface complexes and competed for the limited number of reactive sites on γ-Al(2)O(3). In binary-sorbate systems, Ni had no effect on Zn sorption, owning to its lower affinity for the metal oxide surface. In contrast, Zn had a higher affinity for the metal oxide surface and reduced Ni sorption. At pH 7.5, Ni and Zn were sorbed as mixed-metal surface precipitates, including Ni–Al layered double hydroxides (LDHs), Zn–Al LDHs, and likely Ni–Zn–Al layered triple/ternary hydroxides. Additionally, at pH 7.5, Ni and Zn do not exhibit competitive sorption effects in the binary system. Taken together, these results indicated that pH critically influenced the reaction products, and provides a crucial scientific basis to understand the potential mobility, bioavailability, and ecotoxicity of Ni and Zn in natural and contaminated geochemical environments. [Image: see text] |
format | Online Article Text |
id | pubmed-5869350 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Springer International Publishing |
record_format | MEDLINE/PubMed |
spelling | pubmed-58693502018-03-30 Competitive sorption of Ni and Zn at the aluminum oxide/water interface: an XAFS study Gou, Wenxian Siebecker, Matthew G. Wang, Zimeng Li, Wei Geochem Trans Research Article Trace metals (e.g. Ni, Zn) leached from industrial and agricultural processes are often simultaneously present in contaminated soils and sediments. Their mobility, bioavailability, and ecotoxicity are affected by sorption and cosorption at mineral/solution interfaces. Cosorption of trace metals has been investigated at the macroscopic level, but there is not a clear understanding of the molecular-scale cosorption processes due to lack of spectroscopic information. In this study, Ni and Zn cosorption to aluminum oxides (γ-Al(2)O(3)) in binary-sorbate systems were compared to their sorption in single-sorbate systems as a function of pH using both macroscopic batch experiments and synchrotron-based X-ray absorption fine structure spectroscopy. At pH 6.0, Ni and Zn were sorbed as inner-sphere surface complexes and competed for the limited number of reactive sites on γ-Al(2)O(3). In binary-sorbate systems, Ni had no effect on Zn sorption, owning to its lower affinity for the metal oxide surface. In contrast, Zn had a higher affinity for the metal oxide surface and reduced Ni sorption. At pH 7.5, Ni and Zn were sorbed as mixed-metal surface precipitates, including Ni–Al layered double hydroxides (LDHs), Zn–Al LDHs, and likely Ni–Zn–Al layered triple/ternary hydroxides. Additionally, at pH 7.5, Ni and Zn do not exhibit competitive sorption effects in the binary system. Taken together, these results indicated that pH critically influenced the reaction products, and provides a crucial scientific basis to understand the potential mobility, bioavailability, and ecotoxicity of Ni and Zn in natural and contaminated geochemical environments. [Image: see text] Springer International Publishing 2018-03-27 /pmc/articles/PMC5869350/ /pubmed/29589126 http://dx.doi.org/10.1186/s12932-018-0054-7 Text en © The Author(s) 2018 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Research Article Gou, Wenxian Siebecker, Matthew G. Wang, Zimeng Li, Wei Competitive sorption of Ni and Zn at the aluminum oxide/water interface: an XAFS study |
title | Competitive sorption of Ni and Zn at the aluminum oxide/water interface: an XAFS study |
title_full | Competitive sorption of Ni and Zn at the aluminum oxide/water interface: an XAFS study |
title_fullStr | Competitive sorption of Ni and Zn at the aluminum oxide/water interface: an XAFS study |
title_full_unstemmed | Competitive sorption of Ni and Zn at the aluminum oxide/water interface: an XAFS study |
title_short | Competitive sorption of Ni and Zn at the aluminum oxide/water interface: an XAFS study |
title_sort | competitive sorption of ni and zn at the aluminum oxide/water interface: an xafs study |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5869350/ https://www.ncbi.nlm.nih.gov/pubmed/29589126 http://dx.doi.org/10.1186/s12932-018-0054-7 |
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