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Electro-enhanced leaching method for the mobilization of Cr(VI) in contaminated groundwater aquifer

Removal of hexavalent chromium [Cr(VI)] from soils and water has been widely studied for its high toxicity. Although leaching method is viewed as an effective approach to eliminate Cr(VI) and some studies attempted to enhance leaching performance via the external electric field, there is little know...

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Autores principales: Hu, Liyang, Zhang, Tingting, Zhang, Dayi, Jiang, Mengyun, Tan, Jie, Li, Jie, Lin, Zuhong, Li, Zetang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093520/
https://www.ncbi.nlm.nih.gov/pubmed/32210249
http://dx.doi.org/10.1038/s41598-020-60896-5
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author Hu, Liyang
Zhang, Tingting
Zhang, Dayi
Jiang, Mengyun
Tan, Jie
Li, Jie
Lin, Zuhong
Li, Zetang
author_facet Hu, Liyang
Zhang, Tingting
Zhang, Dayi
Jiang, Mengyun
Tan, Jie
Li, Jie
Lin, Zuhong
Li, Zetang
author_sort Hu, Liyang
collection PubMed
description Removal of hexavalent chromium [Cr(VI)] from soils and water has been widely studied for its high toxicity. Although leaching method is viewed as an effective approach to eliminate Cr(VI) and some studies attempted to enhance leaching performance via the external electric field, there is little knowledge about the influential factor in electro-leaching system on Cr(VI) removal performance. In this study, an electro-leaching technology was developed for removing Cr(VI) from groundwater aquifer to comprehensively discuss the correlation between the operational parameters and Cr(VI) removal efficiency. When the applied voltage was 20 V and the initial Cr(VI) concentration was 40 mg/kg, Cr(VI) removal efficiency achieved 99.9% in 120 min in the electro-leaching system, 15% higher than the system without the electric field. Cr(VI) removal efficiencies increased with the voltage demonstrating the significant enhancement of the electro-leaching method in removing Cr(VI). When Cr(VI) concentration climbed to 120 mg/kg, Cr(VI) removal efficiency remained above 85%. The effects of different voltages, Cr(VI) concentrations, pollutant distribution and salt content of leaching solution on the leaching effect were also investigated. Meanwhile, the relationship between the current intensity change and the amount of removed Cr(VI) during the electro-leaching process was first investigated, and the relevant model was fitted. There is a quadratic linear correlation between the amount of current change and the amount of removed Cr(VI). This novel electro-enhanced leaching method can effectively remove Cr(VI) from contaminated groundwater aquifer by enhancing the migration of charged contaminant ions during the leaching process, and it is worthy of further study of heavy metal remediation.
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spelling pubmed-70935202020-03-27 Electro-enhanced leaching method for the mobilization of Cr(VI) in contaminated groundwater aquifer Hu, Liyang Zhang, Tingting Zhang, Dayi Jiang, Mengyun Tan, Jie Li, Jie Lin, Zuhong Li, Zetang Sci Rep Article Removal of hexavalent chromium [Cr(VI)] from soils and water has been widely studied for its high toxicity. Although leaching method is viewed as an effective approach to eliminate Cr(VI) and some studies attempted to enhance leaching performance via the external electric field, there is little knowledge about the influential factor in electro-leaching system on Cr(VI) removal performance. In this study, an electro-leaching technology was developed for removing Cr(VI) from groundwater aquifer to comprehensively discuss the correlation between the operational parameters and Cr(VI) removal efficiency. When the applied voltage was 20 V and the initial Cr(VI) concentration was 40 mg/kg, Cr(VI) removal efficiency achieved 99.9% in 120 min in the electro-leaching system, 15% higher than the system without the electric field. Cr(VI) removal efficiencies increased with the voltage demonstrating the significant enhancement of the electro-leaching method in removing Cr(VI). When Cr(VI) concentration climbed to 120 mg/kg, Cr(VI) removal efficiency remained above 85%. The effects of different voltages, Cr(VI) concentrations, pollutant distribution and salt content of leaching solution on the leaching effect were also investigated. Meanwhile, the relationship between the current intensity change and the amount of removed Cr(VI) during the electro-leaching process was first investigated, and the relevant model was fitted. There is a quadratic linear correlation between the amount of current change and the amount of removed Cr(VI). This novel electro-enhanced leaching method can effectively remove Cr(VI) from contaminated groundwater aquifer by enhancing the migration of charged contaminant ions during the leaching process, and it is worthy of further study of heavy metal remediation. Nature Publishing Group UK 2020-03-24 /pmc/articles/PMC7093520/ /pubmed/32210249 http://dx.doi.org/10.1038/s41598-020-60896-5 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Hu, Liyang
Zhang, Tingting
Zhang, Dayi
Jiang, Mengyun
Tan, Jie
Li, Jie
Lin, Zuhong
Li, Zetang
Electro-enhanced leaching method for the mobilization of Cr(VI) in contaminated groundwater aquifer
title Electro-enhanced leaching method for the mobilization of Cr(VI) in contaminated groundwater aquifer
title_full Electro-enhanced leaching method for the mobilization of Cr(VI) in contaminated groundwater aquifer
title_fullStr Electro-enhanced leaching method for the mobilization of Cr(VI) in contaminated groundwater aquifer
title_full_unstemmed Electro-enhanced leaching method for the mobilization of Cr(VI) in contaminated groundwater aquifer
title_short Electro-enhanced leaching method for the mobilization of Cr(VI) in contaminated groundwater aquifer
title_sort electro-enhanced leaching method for the mobilization of cr(vi) in contaminated groundwater aquifer
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093520/
https://www.ncbi.nlm.nih.gov/pubmed/32210249
http://dx.doi.org/10.1038/s41598-020-60896-5
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