Nitrite reduction and formation of corrosion coatings in zerovalent iron systems

Huang, Yong; Zhang, Tian C.

doi:10.1016/j.chemosphere.2006.01.025

Cited by 59 publications

(44 citation statements)

References 20 publications

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“…It is likely that the increase in ORP is caused by nitrite reduction, and the increase-maximum-decrease trend is caused by the difference in nitrite reduction rate. Nitrite reduction rate is accelerated by Fe 2+ ions [55] in the second phase. Notably, this correlates with the time Fe 2+ in ferrite is consumed, leading to ferrite deterioration and release of Pb 2+ .…”

Section: Mechanisms Of Formation and Transformation Of Pb-containing mentioning

confidence: 99%

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Effects of nitrate on the treatment of lead contaminated groundwater by nanoscale zerovalent iron

Adeleye

Zhou

et al. 2014

Journal of Hazardous Materials

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Section: Mechanisms Of Formation and Transformation Of Pb-containing mentioning

confidence: 99%

“…In the second phase, accumulated nitrite (from nitrate reduction by Fe 0 ) is reduced with the electrons donated by Fe 0 (in excess Fe 0 conditions) or Fe 2+ (in excess nitrate conditions) [55]. ORP does not change much in excess Fe 0 conditions because the Fe 0 film remains on the electrode.…”

Section: Mechanisms Of Formation and Transformation Of Pb-containing mentioning

confidence: 99%

Effects of nitrate on the treatment of lead contaminated groundwater by nanoscale zerovalent iron

Adeleye

Zhou

et al. 2014

Journal of Hazardous Materials

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“…Zero-valent metal (Fe 0 , Al 0 ) will remove [5,38,40] nitrates [41][42][43][44][45][46][47][48][49][50][51][52][53][54], nitrites [55,56], bromates [54], chlorates [54], organic compounds (including organo-halides [4][5][6][7]16,[57][58][59][60][61][62][63]) and metals (Ag [64], Al [5], As [40,65,66], Ba [5], Cd [12,64], Co [40], Cr [5,63], Cu [5,42], Fe [5], Hg [64], Mn [5], Ni [42], Pb …”

Section: Space Velocitymentioning

confidence: 99%

Sustainable Zero-Valent Metal (ZVM) Water Treatment Associated with Diffusion, Infiltration, Abstraction, and Recirculation

Antia¹

2010

Sustainability

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Socio-economic, climate and agricultural stress on water resources have resulted in increased global demand for water while at the same time the proportion of potential water resources which are adversely affected by sodification/salinisation, metals, nitrates, and organic chemicals has increased. Nano-zero-valent metal (n-ZVM) injection or placement in aquifers offers a potential partial solution. However, n-ZVM application results in a substantial reduction in aquifer permeability, which in turn can reduce the amount of water that can be abstracted from the aquifer. This study using static diffusion and continuous flow reactors containing n-ZVM and m-ZVM (ZVM filaments, filings and punchings) has established that the use of m-ZVM does not result in a reduction in aquifer permeability. The experimental results are used to design and model m-ZVM treatment programs for an aquifer (using recirculation or static diffusion). They also provide a predictive model for water quality associated with specific abstraction rates and infiltration/injection into an aquifer. The study demonstrates that m-ZVM treatment requires 1% of the weight required for n-ZVM treatment for a specific flow rate. It is observed that 1 t Fe 0 will process 23,500 m 3 of abstracted or infiltrating water. m-ZVM is able to remove >80% of nitrates from flowing water and adjust the water composition (by reduction) in an aquifer to optimize removal of nitrates, metals and organic compounds. The experiments demonstrate that ZVM treatment of an aquifer can be used to reduce groundwater salinity by 20 -> 45% and that an aquifer remediation program can be designed to desalinate an aquifer. Modeling indicates that widespread application of m-ZVM water treatment may reduce global socio-economic, climate and agricultural stress on water resources. The rate of oxygen formation during water reduction OPEN ACCESSSustainability 2010, 2 2989[by ZVM (Fe 0 , Al 0 and Cu 0 )] controls aquifer permeability, the associated aquifer pH, aquifer Eh and the degree of water treatment that occurs.

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“…In fact, nitrite or nitrate is a strong oxidant and the production of nitrogen species depends on the form of iron corrosion, and availability of the adsorbed surface [19]. The XANES spectra may provide information of electronic configuration, stereochemistry and the oxidation states of Fe atoms in the ZVIN being investigated [20][21][22][23].…”

Section: Mechanisms and Surface Reaction On Zvinmentioning

confidence: 99%

“…Reduction of nitrite/nitrate using ZVIN is deemed the most cost-effective option in many studies [13][14][15]. Therefore, innovative applications of the ZVIN for in-situ groundwater remediation or for the treatment of industrial waste streams contaminated with redox active toxic material can often be found [16][17][18][19]. However, the reaction mechanism of nitrite/nitrate removals is significantly dependent on pH, both in buffered and unbuffered solutions [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Fine structure characterization of zero-valent iron nanoparticles for decontamination of nitrites and nitrates in wastewater and groundwater

Lin

Chang

Chuang

2008

Science and Technology of Advanced Materials

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The main objectives of the present study were to investigate the chemical reduction of nitrate or nitrite species by zero-valent iron nanoparticle (ZVIN) in aqueous solution and related reaction kinetics or mechanisms using fine structure characterization. This work also exemplifies the utilization of field emission-scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), and x-ray diffraction (XRD) to reveal the speciation and possible reaction pathway in a very complex adsorption and redox reaction process. Experimentally, ZVIN of this study was prepared by sodium borohydride reduction method at room temperature and ambient pressure. The morphology of as-synthesized ZVIN shows that the nearly ball and ultrafine particles ranged of 20-50 nm were observed with FE-SEM or TEM analysis. The kinetic model of nitrites or nitrates reductive reaction by ZVIN is proposed as a pseudo first-order kinetic equation. The nitrite and nitrate removal efficiencies using ZVIN were found 65-83% and 51-68%, respectively, based on three different initial concentrations. Based on the XRD pattern analyses, it is found that the quantitative relationship between nitrite and Fe(III) or Fe(II) is similar to the one between nitrate and Fe(III) in the ZVIN study. The possible reason is due to the faster nitrite reduction by ZVIN. In fact, the occurrence of the relative faster nitrite reductive reaction suggested that the passivation of the ZVIN have a significant contribution to iron corrosion. The extended x-ray absorption fine structure (EXAFS) or x-ray absorption near edge structure (XANES) spectra show that the nitrites or nitrates reduce to N 2 or NH 3 while oxidizing the ZVIN to Fe 2 O 3 or Fe 3 O 4 electrochemically. It is also very clear that decontamination of nitrate or nitrite species in groundwater via the in-situ remediation with a ZVIN permeable reactive barrier would be environmentally attractive.

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Nitrite reduction and formation of corrosion coatings in zerovalent iron systems

Cited by 59 publications

References 20 publications

Effects of nitrate on the treatment of lead contaminated groundwater by nanoscale zerovalent iron

Effects of nitrate on the treatment of lead contaminated groundwater by nanoscale zerovalent iron

Sustainable Zero-Valent Metal (ZVM) Water Treatment Associated with Diffusion, Infiltration, Abstraction, and Recirculation

Fine structure characterization of zero-valent iron nanoparticles for decontamination of nitrites and nitrates in wastewater and groundwater

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