The effect of common groundwater anions on the aqueous corrosion of zero-valent iron nanoparticles and associated removal of aqueous copper and zinc

Pullin, Huw; Crane, Richard A.; Morgan, David; Scott, Thomas Bligh

doi:10.1016/j.jece.2017.01.038

Cited by 48 publications

(35 citation statements)

References 35 publications

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“…Most of the published literature to date has addressed the impact of synthesis methods 107 and both organic and inorganic compounds 4,33,80,[108][109][110][111][112][113][114][115][116][117] on the reactivity of NZVI with respect to target contaminants in the context of groundwater or wastewater remediation.…”

Section: Factors Influencing Nzvi Passivationmentioning

confidence: 99%

“…33 Using the same concentrations of the anionic species, NZVI H2 particles have also been found to undergo corrosion into different iron phases after 16 weeks. 80 For example, HCO 3 − produced goethite , NO 3 − resulted in the formation of magnetite/maghemite and SO 4 2− and Cl − produced a mixture of magnetite/maghemite, lepidocrocite and goethite ( Figure S4). 80 suspensions.…”

Section: Effect Of Inorganic Compoundsmentioning

confidence: 99%

“…80 For example, HCO 3 − produced goethite , NO 3 − resulted in the formation of magnetite/maghemite and SO 4 2− and Cl − produced a mixture of magnetite/maghemite, lepidocrocite and goethite ( Figure S4). 80 suspensions. In addition, XRD analyses suggested that the loss in reactivity in NOsuspensions resulted from Fe(0) conversion into magnetite, whereas the formation of iron carbonate hydroxide limited reactivity in the HCO 3 suspensions (Figure 4) or Ni 2+ ions to their elemental forms is thermodynamically favorable.…”

Section: Effect Of Inorganic Compoundsmentioning

confidence: 99%

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Advances in Surface Passivation of Nanoscale Zerovalent Iron: A Critical Review

Bae

Collins

Waite

et al. 2018

Environ. Sci. Technol.

271

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Nanoscale zerovalent iron (NZVI) is one of the most extensively studied nanomaterials in the fields of wastewater treatment and remediation of soil and groundwater. However, rapid oxidative transformations of NZVI can result in reduced NZVI reactivity. Indeed, the surface passivation of NZVI is considered one of the most challenging aspects in successfully applying NZVI to contaminant degradation. The oxidation of NZVI can lead to the formation of Fe II-bearing phases (e.g., Fe II O, Fe II (OH) 2 , Fe II Fe III 2 O 4) on the NZVI surface or complete oxidation to ferric (oxyhydr)oxides (e.g., Fe III OOH). This corrosion phenomenon is dependent upon various factors including the composition of NZVI itself, the type and concentration of aqueous species, reaction time and oxic/anoxic environments. As such, the coexistence of different Fe oxidation states on NZVI surfaces may also, in some instances, provide a unique reactive microenvironment to promote the adsorption of contaminants and their subsequent transformation via redox reactions. Thus, an understanding of passivation chemistry, and its related mechanisms, is essential not only for effective NZVI application but also for accurately assessing the positive and negative effects of NZVI surface passivation. The aim of this review is to discuss the nature of the passivation processes that occur and the passivation byproducts that form in various environments. In particular, the review presents: i) the strengths and limitations of state-of-the-art techniques (e.g., electron microscopies and X-ray based spectroscopies) to identify passivation byproducts; ii) the passivation mechanisms proposed to occur in anoxic and oxic environments; and iii) the effects arising from synthesis procedures and the presence of inorganics/organics on the nature of the passivation byproducts that form. In addition, several depassivation strategies that may assist in increasing and/or maintaining the reactivity of NZVI are considered, thereby enhancing the effectiveness of NZVI in contaminant degradation.

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Section: Factors Influencing Nzvi Passivationmentioning

confidence: 99%

Section: Effect Of Inorganic Compoundsmentioning

confidence: 99%

Section: Effect Of Inorganic Compoundsmentioning

confidence: 99%

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Advances in Surface Passivation of Nanoscale Zerovalent Iron: A Critical Review

Bae

Collins

Waite

et al. 2018

Environ. Sci. Technol.

271

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show abstract

“…Spring and autumn seasons have the highest concentrations, including most of the wells, indicating that the high concentration are not affected by the nature of the region, and we find these high concentrations in well water, which are located within the aquifers, which have the characteristics of rocky geology in the surface layers and also in the deep layers, Layers are aerobic. The data of the iron concentration showed in [23]. The copper concentration (0.20 mg/l) is lower than the maximum permissible limit set by the Egyptian government (3 mg/l) Table 3-3a, b, fig.…”

mentioning

confidence: 87%

Spectroscopic Determination of Some Heavy Metals and Their Effect on the Quality of Groundwater.

Elaal¹,

Hegazy²,

Ibrahem³

et al. 2017

IJAR

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“…Permeable reactive barrier technology is an in situ remediation technique that involves the use of tools to dig out soil and then ll a reactive medium to treat the soil and groundwater. 13,14 Currently, the PRB technology is oen used with zerovalent iron as the medium to treat contaminated soil and groundwater, and it has been proven as an effective technique to treat several contaminants. The reliability of this technique was proven by Natale et al where they used an activated carbon PRB for the removal of cadmium from a contaminated shallow aquifer.…”

Section: Introductionmentioning

confidence: 99%