The short-term reduction of uranium by nanoscale zero-valent iron (nZVI): role of oxide shell, reduction mechanism and the formation of U(v)-carbonate phases

2017 ◽  
Vol 4 (6) ◽  
pp. 1304-1313 ◽  
Author(s):  
Sergey Tsarev ◽  
Richard N. Collins ◽  
Eugene S. Ilton ◽  
Adam Fahy ◽  
T. David Waite
Keyword(s):  
Solid Phase ◽  
Zero Valent Iron ◽  
Oxide Shell ◽  
Reduction Mechanism ◽  
Short Term ◽  
Nanoscale Zero Valent Iron

Uranium(v) can be stabilized in a carbonate solid phase upon reaction with nanoscale zero-valent iron (nZVI).

Unveiling the Role of Sulfur in Rapid Defluorination of Florfenicol by Sulfidized Nanoscale Zero-Valent Iron in Water under Ambient Conditions

2021 ◽  
Vol 55 (4) ◽  
pp. 2628-2638
Author(s):  
Zhen Cao ◽  
Hao Li ◽  
Gregory V. Lowry ◽  
Xiaoyang Shi ◽  
Xiangcheng Pan ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Ambient Conditions ◽  
Nanoscale Zero Valent Iron

Transport of sucrose-modified nanoscale zero-valent iron in saturated porous media: role of media size, injection rate and input concentration

2015 ◽  
Vol 72 (9) ◽  
pp. 1463-1471 ◽  
Author(s):  
Hui Li ◽  
Yong-sheng Zhao ◽  
Zhan-tao Han ◽  
Mei Hong
Keyword(s):  
Porous Media ◽  
Packed Column ◽  
Injection Rate ◽  
Zero Valent Iron ◽  
Silica Sand ◽  
Saturated Porous Media ◽  
Input Concentration ◽  
K Value ◽  
Nanoscale Zero Valent Iron

The growing use of nanoscale zero-valent iron (NZVI) in the remediation of contaminated groundwater raises concerns regarding its transport in aquifers. Laboratory-scale sand-packed column experiments were conducted with bare and sucrose-modified NZVI (SM-NZVI) to improve our understanding of the transport of the nanoparticles in saturated porous media, as well as the role of media size, suspension injection rate and concentration on the nanoparticle behavior. As the main indicative parameters, the normalized effluent concentration was measured and the deposition rate coefficient (k) was calculated for different simulated conditions. Overall, compared to the high retention of bare NZVI in the saturated silica column, SM-NZVI suspension could travel through the coarse sand column easily. However, the transport of SM-NZVI particles was not very satisfactory in a smaller size granular matrix especially in fine silica sand. Furthermore, the value of k regularly decreased with the increasing injection rate of suspension but increased with suspension concentration, which could reflect the role of these factors in the SM-NZVI travel process. The calculation of k-value at the tests condition adequately described the experimental results from the point of deposition dynamics, which meant the assumption of first-order deposition kinetics for the transport of NZVI particles was reasonable and feasible.

Role of sulfide-modified nanoscale zero-valent iron on carbon nanotubes in nonradical activation of peroxydisulfate

2022 ◽  
Vol 422 ◽  
pp. 126949
Author(s):  
Libin Wu ◽  
Qintie Lin ◽  
Hengyi Fu ◽  
Haoyu Luo ◽  
Quanfa Zhong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

scholarly journals In Vitro Study of the Toxicity Mechanisms of Nanoscale Zero-Valent Iron (nZVI) and Released Iron Ions Using Earthworm Cells

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2189
Author(s):  
Jaroslav Semerad ◽  
Natividad Isabel Navarro Pacheco ◽  
Alena Grasserova ◽  
Petra Prochazkova ◽  
Martin Pivokonsky ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Reactive Oxygen Species ◽  
Reactive Oxygen ◽  
Zero Valent Iron ◽  
Oxygen Species ◽  
Iron Ions ◽  
Short Term ◽  
Nanoscale Zero Valent Iron ◽  
Toxicity Mechanisms

During the last two decades, nanomaterials based on nanoscale zero-valent iron (nZVI) have ranked among the most utilized remediation technologies for soil and groundwater cleanup. The high reduction capacity of elemental iron (Fe0) allows for the rapid and cost-efficient degradation or transformation of many organic and inorganic pollutants. Although worldwide real and pilot applications show promising results, the effects of nZVI on exposed living organisms are still not well explored. The majority of the recent studies examined toxicity to microbes and to a lesser extent to other organisms that could also be exposed to nZVI via nanoremediation applications. In this work, a novel approach using amoebocytes, the immune effector cells of the earthworm Eisenia andrei, was applied to study the toxicity mechanisms of nZVI. The toxicity of the dissolved iron released during exposure was studied to evaluate the effect of nZVI aging with regard to toxicity and to assess the true environmental risks. The impact of nZVI and associated iron ions was studied in vitro on the subcellular level using different toxicological approaches, such as short-term immunological responses and oxidative stress. The results revealed an increase in reactive oxygen species production following nZVI exposure, as well as a dose-dependent increase in lipid peroxidation. Programmed cell death (apoptosis) and necrosis were detected upon exposure to ferric and ferrous ions, although no lethal effects were observed at environmentally relevant nZVI concentrations. The decreased phagocytic activity further confirmed sublethal adverse effects, even after short-term exposure to ferric and ferrous iron. Detection of sublethal effects, including changes in oxidative stress-related markers such as reactive oxygen species and malondialdehyde production revealed that nZVI had minimal impacts on exposed earthworm cells. In comparison to other works, this study provides more details regarding the effects of the individual iron forms associated with nZVI aging and the cell toxicity effects on the specific earthworms’ immune cells that represent a suitable model for nanomaterial testing.

Probing pollutants reactions at the iron surface: A case study of selenite reactions with nanoscale zero-valent iron

2021 ◽  
Author(s):  
Qing Huang ◽  
Tianhang Gu ◽  
Airong Liu ◽  
Jing Liu ◽  
Wei-Xian Zhang
Keyword(s):  
Reaction Mechanism ◽  
Solid Phase ◽  
Zero Valent Iron ◽  
Iron Surface ◽  
High Efficacy ◽  
Redox Transformations ◽  
Nanoscale Zero Valent Iron

Nanoscale zero-valent iron (nZVI) has shown a high efficacy for removing selenite (Se(IV)) from water, yet the reaction mechanism in solid phase, especially the redox transformations of selenite in the...

Role of oxidative stress in inactivation of Escherichia coli BW25113 by nanoscale zero-valent iron

2016 ◽  
Vol 565 ◽  
pp. 857-862 ◽  
Author(s):  
Krittanut Chaithawiwat ◽  
Alisa Vangnai ◽  
John M. McEvoy ◽  
Birgit Pruess ◽  
Sita Krajangpan ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Escherichia Coli ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

scholarly journals Magnetic solid phase extraction based on graphene oxide/nanoscale zero-valent iron for the determination of tetracyclines in water and milk by using HPLC-MS/MS

RSC Advances ◽  
2017 ◽  
Vol 7 (70) ◽  
pp. 44578-44586 ◽  
Author(s):  
Dan Wei ◽  
Shuchao Wu ◽  
Yan Zhu
Keyword(s):  
Graphene Oxide ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
Zero Valent Iron ◽  
Phase Extraction ◽  
Tetracycline Antibiotics ◽  
Nanoscale Zero Valent Iron ◽  
Magnetic Solid

A magnetic solid-phase extraction (MSPE) based on graphene oxide/nanoscale zero-valent iron (GO/nZVI) coupled with HPLC-MS/MS was proposed for the determination of trace tetracycline antibiotics (TCs) in water and milk.

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