The role of soil components in synthetic mixtures during the adsorption and speciation changes of Cr(VI): Conjunction of the modeling approach with spectroscopic and isotopic investigations
This study investigates redox transitions associated with the adsorption of Cr(VI) on commonly occurring soil components (silicates, oxides and humic acids) and their synthetic mixtures by coupling the mechanistic surface complexation modeling with spectroscopic and isotopic analyses. The mixtures o...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-06-01
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| Series: | Environment International |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S016041201832943X |
| _version_ | 1818515184410427392 |
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| author | Veronika Veselská Hana Šillerová Jörg Göttlicher Zuzana Michálková Jamal A. Siddique Sylva Číhalová Vladislav Chrastný Ralph Steininger Stefan Mangold Michael Komárek |
| author_facet | Veronika Veselská Hana Šillerová Jörg Göttlicher Zuzana Michálková Jamal A. Siddique Sylva Číhalová Vladislav Chrastný Ralph Steininger Stefan Mangold Michael Komárek |
| author_sort | Veronika Veselská |
| collection | DOAJ |
| description | This study investigates redox transitions associated with the adsorption of Cr(VI) on commonly occurring soil components (silicates, oxides and humic acids) and their synthetic mixtures by coupling the mechanistic surface complexation modeling with spectroscopic and isotopic analyses. The mixtures of soil components were prepared to reflect the composition of the real anthroposol sample, determined by X-ray Powder Diffraction (XRD), total organic carbon (TOC) measurement and extraction methods. The effect of different initial Cr(VI) concentrations (2×10−2, 5×10−4, 10−4, 10−5, and 10−6M), background electrolyte (10−3, 10−2, and 10−1M KNO3), pH values (3–9), and sorbate/sorbent ratios (2g/L - 20g/L) were investigated. Maghemite and ferrihydrite were confirmed to be the main phases controlling Cr(VI) adsorption with increasing Cr(VI) concentration. Humic acids were primarily responsible for Cr(VI) reduction, especially at low pH values. The reduction of Cr(VI) was also proved in case of illite and kaolinite by XAS and isotopic analyses. Illite revealed higher reduction capacity in comparison with kaolinite based on XAS measurements. Chromium isotopic fractionation, resulting from Cr(VI) reduction, was the highest in the case of humic acids, followed by kaolinite and illite. However, a dissolution of intrinsic Cr originally present within kaolinite and illite might affect the final Cr isotopic composition of the supernatants due to its different Cr isotopic signature. In general, the combination of three different approaches was confirmed to offer more comprehensive information about Cr(VI) adsorption and/or reduction in soils. Detailed studies using soil mixtures can help to predict how the soil components affect Cr(VI) behavior in natural soils and possibly could improve the environmental remediation processes. Keywords: Chromate reduction, Soil component mixtures, Adsorption modeling, Cr isotopes, X-ray absorption spectroscopy |
| first_indexed | 2024-12-11T00:25:47Z |
| format | Article |
| id | doaj.art-01ab3241be25484d9036ae10b265045e |
| institution | Directory Open Access Journal |
| issn | 0160-4120 |
| language | English |
| last_indexed | 2024-12-11T00:25:47Z |
| publishDate | 2019-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Environment International |
| spelling | doaj.art-01ab3241be25484d9036ae10b265045e2022-12-22T01:27:32ZengElsevierEnvironment International0160-41202019-06-01127848857The role of soil components in synthetic mixtures during the adsorption and speciation changes of Cr(VI): Conjunction of the modeling approach with spectroscopic and isotopic investigationsVeronika Veselská0Hana Šillerová1Jörg Göttlicher2Zuzana Michálková3Jamal A. Siddique4Sylva Číhalová5Vladislav Chrastný6Ralph Steininger7Stefan Mangold8Michael Komárek9Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, CZ-16500 Prague, Czech Republic; Corresponding author.Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, CZ-16500 Prague, Czech RepublicInstitute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, DE-76344 Eggenstein-Leopoldshafen, GermanyDepartment of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, CZ-16500 Prague, Czech RepublicDepartment of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, CZ-16500 Prague, Czech RepublicDepartment of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, CZ-16500 Prague, Czech RepublicDepartment of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, CZ-16500 Prague, Czech RepublicInstitute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, DE-76344 Eggenstein-Leopoldshafen, GermanyInstitute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, DE-76344 Eggenstein-Leopoldshafen, GermanyDepartment of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, CZ-16500 Prague, Czech RepublicThis study investigates redox transitions associated with the adsorption of Cr(VI) on commonly occurring soil components (silicates, oxides and humic acids) and their synthetic mixtures by coupling the mechanistic surface complexation modeling with spectroscopic and isotopic analyses. The mixtures of soil components were prepared to reflect the composition of the real anthroposol sample, determined by X-ray Powder Diffraction (XRD), total organic carbon (TOC) measurement and extraction methods. The effect of different initial Cr(VI) concentrations (2×10−2, 5×10−4, 10−4, 10−5, and 10−6M), background electrolyte (10−3, 10−2, and 10−1M KNO3), pH values (3–9), and sorbate/sorbent ratios (2g/L - 20g/L) were investigated. Maghemite and ferrihydrite were confirmed to be the main phases controlling Cr(VI) adsorption with increasing Cr(VI) concentration. Humic acids were primarily responsible for Cr(VI) reduction, especially at low pH values. The reduction of Cr(VI) was also proved in case of illite and kaolinite by XAS and isotopic analyses. Illite revealed higher reduction capacity in comparison with kaolinite based on XAS measurements. Chromium isotopic fractionation, resulting from Cr(VI) reduction, was the highest in the case of humic acids, followed by kaolinite and illite. However, a dissolution of intrinsic Cr originally present within kaolinite and illite might affect the final Cr isotopic composition of the supernatants due to its different Cr isotopic signature. In general, the combination of three different approaches was confirmed to offer more comprehensive information about Cr(VI) adsorption and/or reduction in soils. Detailed studies using soil mixtures can help to predict how the soil components affect Cr(VI) behavior in natural soils and possibly could improve the environmental remediation processes. Keywords: Chromate reduction, Soil component mixtures, Adsorption modeling, Cr isotopes, X-ray absorption spectroscopyhttp://www.sciencedirect.com/science/article/pii/S016041201832943X |
| spellingShingle | Veronika Veselská Hana Šillerová Jörg Göttlicher Zuzana Michálková Jamal A. Siddique Sylva Číhalová Vladislav Chrastný Ralph Steininger Stefan Mangold Michael Komárek The role of soil components in synthetic mixtures during the adsorption and speciation changes of Cr(VI): Conjunction of the modeling approach with spectroscopic and isotopic investigations Environment International |
| title | The role of soil components in synthetic mixtures during the adsorption and speciation changes of Cr(VI): Conjunction of the modeling approach with spectroscopic and isotopic investigations |
| title_full | The role of soil components in synthetic mixtures during the adsorption and speciation changes of Cr(VI): Conjunction of the modeling approach with spectroscopic and isotopic investigations |
| title_fullStr | The role of soil components in synthetic mixtures during the adsorption and speciation changes of Cr(VI): Conjunction of the modeling approach with spectroscopic and isotopic investigations |
| title_full_unstemmed | The role of soil components in synthetic mixtures during the adsorption and speciation changes of Cr(VI): Conjunction of the modeling approach with spectroscopic and isotopic investigations |
| title_short | The role of soil components in synthetic mixtures during the adsorption and speciation changes of Cr(VI): Conjunction of the modeling approach with spectroscopic and isotopic investigations |
| title_sort | role of soil components in synthetic mixtures during the adsorption and speciation changes of cr vi conjunction of the modeling approach with spectroscopic and isotopic investigations |
| url | http://www.sciencedirect.com/science/article/pii/S016041201832943X |
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