Nanoscale Zero-Valent Iron Modified by Bentonite with Enhanced Cr(VI) Removal Efficiency, Improved Mobility, and Reduced Toxicity

The aggregation of nanoscale zero-valent iron (nZVI) particles and their limited transport ability in environmental media hinder their application in environmental remediation. In this study, the Cr(VI) removal efficiency, transport performance, and toxicity of nZVI and bentonite-modified nZVI (B-nZ...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2021-09, Vol.11 (10), p.2580
Main Authors: Ye, Jien, Luo, Yating, Sun, Jiacong, Shi, Jiyan
Format: Article
Language:English
Subjects:
Bacteria
Bentonite
Chromium
Efficiency
Environmental cleanup
Environmental restoration
Ethanol
Ethylenediaminetetraacetic acids
Experiments
Flow rates
Flow velocity
Gas absorption
hexavalent chromium
Iron
Luminous bacteria
Nanoparticles
nanoscale zerovalent iron (nZVI)
Oxidative stress
Pollutants
Potassium
Quartz
Radiation
Remediation
Sand
Sand transport
Seeds
Soil sciences
Toxicity
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Sun, Jiacong
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description The aggregation of nanoscale zero-valent iron (nZVI) particles and their limited transport ability in environmental media hinder their application in environmental remediation. In this study, the Cr(VI) removal efficiency, transport performance, and toxicity of nZVI and bentonite-modified nZVI (B-nZVI) were investigated. Compared with nZVI, B-nZVI improved the removal efficiency of Cr(VI) by 10%, and also significantly increased the transport in quartz sand and soil. Increasing the flow rate can enhance the transport of nZVI and B-nZVI in the quartz sand columns. The transport of the two materials in different soils was negatively correlated with the clay composition. Besides, modification of nZVI by bentonite could reduce toxicity to luminous bacteria (Photobacterium phosphereum T3) and ryegrass (Lolium perenne L.). Compared with Fe-EDTA, the transfer factors of nZVI and B-nZVI were 65.0% and 66.4% lower, respectively. This indicated that although iron nanoparticles accumulated in the roots of ryegrass, they were difficult to be transported to the shoots. The results of this study indicate that B-nZVI has a strong application potential in in situ environmental remediation.
doi_str_mv 10.3390/nano11102580
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In this study, the Cr(VI) removal efficiency, transport performance, and toxicity of nZVI and bentonite-modified nZVI (B-nZVI) were investigated. Compared with nZVI, B-nZVI improved the removal efficiency of Cr(VI) by 10%, and also significantly increased the transport in quartz sand and soil. Increasing the flow rate can enhance the transport of nZVI and B-nZVI in the quartz sand columns. The transport of the two materials in different soils was negatively correlated with the clay composition. Besides, modification of nZVI by bentonite could reduce toxicity to luminous bacteria (Photobacterium phosphereum T3) and ryegrass (Lolium perenne L.). Compared with Fe-EDTA, the transfer factors of nZVI and B-nZVI were 65.0% and 66.4% lower, respectively. This indicated that although iron nanoparticles accumulated in the roots of ryegrass, they were difficult to be transported to the shoots. The results of this study indicate that B-nZVI has a strong application potential in in situ environmental remediation.</description><identifier>ISSN: 2079-4991</identifier><identifier>EISSN: 2079-4991</identifier><identifier>DOI: 10.3390/nano11102580</identifier><identifier>PMID: 34685019</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Bacteria ; Bentonite ; Chromium ; Efficiency ; Environmental cleanup ; Environmental restoration ; Ethanol ; Ethylenediaminetetraacetic acids ; Experiments ; Flow rates ; Flow velocity ; Gas absorption ; hexavalent chromium ; Iron ; Luminous bacteria ; Nanoparticles ; nanoscale zerovalent iron (nZVI) ; Oxidative stress ; Pollutants ; Potassium ; Quartz ; Radiation ; Remediation ; Sand ; Sand transport ; Seeds ; Soil sciences ; Toxicity</subject><ispartof>Nanomaterials (Basel, Switzerland), 2021-09, Vol.11 (10), p.2580</ispartof><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. 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In this study, the Cr(VI) removal efficiency, transport performance, and toxicity of nZVI and bentonite-modified nZVI (B-nZVI) were investigated. Compared with nZVI, B-nZVI improved the removal efficiency of Cr(VI) by 10%, and also significantly increased the transport in quartz sand and soil. Increasing the flow rate can enhance the transport of nZVI and B-nZVI in the quartz sand columns. The transport of the two materials in different soils was negatively correlated with the clay composition. Besides, modification of nZVI by bentonite could reduce toxicity to luminous bacteria (Photobacterium phosphereum T3) and ryegrass (Lolium perenne L.). Compared with Fe-EDTA, the transfer factors of nZVI and B-nZVI were 65.0% and 66.4% lower, respectively. This indicated that although iron nanoparticles accumulated in the roots of ryegrass, they were difficult to be transported to the shoots. The results of this study indicate that B-nZVI has a strong application potential in in situ environmental remediation.</abstract><cop>Basel</cop><pub>MDPI AG</pub><pmid>34685019</pmid><doi>10.3390/nano11102580</doi><oa>free_for_read</oa></addata></record>
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subjects Bacteria
Bentonite
Chromium
Efficiency
Environmental cleanup
Environmental restoration
Ethanol
Ethylenediaminetetraacetic acids
Experiments
Flow rates
Flow velocity
Gas absorption
hexavalent chromium
Iron
Luminous bacteria
Nanoparticles
nanoscale zerovalent iron (nZVI)
Oxidative stress
Pollutants
Potassium
Quartz
Radiation
Remediation
Sand
Sand transport
Seeds
Soil sciences
Toxicity
title Nanoscale Zero-Valent Iron Modified by Bentonite with Enhanced Cr(VI) Removal Efficiency, Improved Mobility, and Reduced Toxicity
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