Chemical pathways of Nanoscale Zero-Valent Iron (NZVI) during its transformation in aqueous solutions

Osama Eljamal, Relebohile Mokete, Nobuhiro Matsunaga, Yuji Sugihara

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The current application of Nanoscale Zero-Valent Iron (NZVI) is subject to the countermeasure of water contamination that escalates with increasing population. Some of the NZVI advantages include; environmental friendliness, high reactivity and cost-effectiveness. NZVI was synthesized through the reduction of a ferric ion by sodium borohydride in anoxic medium and the resulting particles were characterized by the Transmission Electron Microscope with Energy-dispersive X-ray (TEM-EDX). The NZVI evolution and dissolution in water were examined through a series of batch experiments conducted in varying experimental conditions which include; pH, temperature, dosage, oxygen and interferences. The dissolution of iron was enhanced in the acidic pH due to the presence of H+ ions thus favoring release of hydrogen gas. More iron ions were present in the lowest temperature (5 °C) due to decreased crystallization and proton assisted dissolution. Furthermore, highest NZVI dosage (3 g/L) resulted in the highest iron ions concentrations in solution due to the increased number of nanoparticles hence providing surface-active sites. Ultimately, more iron ions were present in limited oxygen supply condition involving initial air saturation showed due to decreased crystallization and precipitation which were favored in continuous supply. These results are a useful guidance during real-life application of NZVI.

Original languageEnglish
Pages (from-to)6207-6220
Number of pages14
JournalJournal of Environmental Chemical Engineering
Volume6
Issue number5
DOIs
Publication statusPublished - Oct 1 2018

Fingerprint

Iron
aqueous solution
ion
iron
dissolution
Ions
crystallization
Dissolution
oxygen
Crystallization
chemical
iron nanoparticle
Oxygen supply
Hydrogen
sodium
hydrogen
saturation
Water
electron
water

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

Cite this

Chemical pathways of Nanoscale Zero-Valent Iron (NZVI) during its transformation in aqueous solutions. / Eljamal, Osama; Mokete, Relebohile; Matsunaga, Nobuhiro; Sugihara, Yuji.

In: Journal of Environmental Chemical Engineering, Vol. 6, No. 5, 01.10.2018, p. 6207-6220.

Research output: Contribution to journalArticle

@article{90475071393f49c6b6ef974faff2240f,
title = "Chemical pathways of Nanoscale Zero-Valent Iron (NZVI) during its transformation in aqueous solutions",
abstract = "The current application of Nanoscale Zero-Valent Iron (NZVI) is subject to the countermeasure of water contamination that escalates with increasing population. Some of the NZVI advantages include; environmental friendliness, high reactivity and cost-effectiveness. NZVI was synthesized through the reduction of a ferric ion by sodium borohydride in anoxic medium and the resulting particles were characterized by the Transmission Electron Microscope with Energy-dispersive X-ray (TEM-EDX). The NZVI evolution and dissolution in water were examined through a series of batch experiments conducted in varying experimental conditions which include; pH, temperature, dosage, oxygen and interferences. The dissolution of iron was enhanced in the acidic pH due to the presence of H+ ions thus favoring release of hydrogen gas. More iron ions were present in the lowest temperature (5 °C) due to decreased crystallization and proton assisted dissolution. Furthermore, highest NZVI dosage (3 g/L) resulted in the highest iron ions concentrations in solution due to the increased number of nanoparticles hence providing surface-active sites. Ultimately, more iron ions were present in limited oxygen supply condition involving initial air saturation showed due to decreased crystallization and precipitation which were favored in continuous supply. These results are a useful guidance during real-life application of NZVI.",
author = "Osama Eljamal and Relebohile Mokete and Nobuhiro Matsunaga and Yuji Sugihara",
year = "2018",
month = "10",
day = "1",
doi = "10.1016/j.jece.2018.09.012",
language = "English",
volume = "6",
pages = "6207--6220",
journal = "Journal of Environmental Chemical Engineering",
issn = "2213-3437",
publisher = "Elsevier BV",
number = "5",

}

TY - JOUR

T1 - Chemical pathways of Nanoscale Zero-Valent Iron (NZVI) during its transformation in aqueous solutions

AU - Eljamal, Osama

AU - Mokete, Relebohile

AU - Matsunaga, Nobuhiro

AU - Sugihara, Yuji

PY - 2018/10/1

Y1 - 2018/10/1

N2 - The current application of Nanoscale Zero-Valent Iron (NZVI) is subject to the countermeasure of water contamination that escalates with increasing population. Some of the NZVI advantages include; environmental friendliness, high reactivity and cost-effectiveness. NZVI was synthesized through the reduction of a ferric ion by sodium borohydride in anoxic medium and the resulting particles were characterized by the Transmission Electron Microscope with Energy-dispersive X-ray (TEM-EDX). The NZVI evolution and dissolution in water were examined through a series of batch experiments conducted in varying experimental conditions which include; pH, temperature, dosage, oxygen and interferences. The dissolution of iron was enhanced in the acidic pH due to the presence of H+ ions thus favoring release of hydrogen gas. More iron ions were present in the lowest temperature (5 °C) due to decreased crystallization and proton assisted dissolution. Furthermore, highest NZVI dosage (3 g/L) resulted in the highest iron ions concentrations in solution due to the increased number of nanoparticles hence providing surface-active sites. Ultimately, more iron ions were present in limited oxygen supply condition involving initial air saturation showed due to decreased crystallization and precipitation which were favored in continuous supply. These results are a useful guidance during real-life application of NZVI.

AB - The current application of Nanoscale Zero-Valent Iron (NZVI) is subject to the countermeasure of water contamination that escalates with increasing population. Some of the NZVI advantages include; environmental friendliness, high reactivity and cost-effectiveness. NZVI was synthesized through the reduction of a ferric ion by sodium borohydride in anoxic medium and the resulting particles were characterized by the Transmission Electron Microscope with Energy-dispersive X-ray (TEM-EDX). The NZVI evolution and dissolution in water were examined through a series of batch experiments conducted in varying experimental conditions which include; pH, temperature, dosage, oxygen and interferences. The dissolution of iron was enhanced in the acidic pH due to the presence of H+ ions thus favoring release of hydrogen gas. More iron ions were present in the lowest temperature (5 °C) due to decreased crystallization and proton assisted dissolution. Furthermore, highest NZVI dosage (3 g/L) resulted in the highest iron ions concentrations in solution due to the increased number of nanoparticles hence providing surface-active sites. Ultimately, more iron ions were present in limited oxygen supply condition involving initial air saturation showed due to decreased crystallization and precipitation which were favored in continuous supply. These results are a useful guidance during real-life application of NZVI.

UR - http://www.scopus.com/inward/record.url?scp=85054505155&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054505155&partnerID=8YFLogxK

U2 - 10.1016/j.jece.2018.09.012

DO - 10.1016/j.jece.2018.09.012

M3 - Article

AN - SCOPUS:85054505155

VL - 6

SP - 6207

EP - 6220

JO - Journal of Environmental Chemical Engineering

JF - Journal of Environmental Chemical Engineering

SN - 2213-3437

IS - 5

ER -