Iron oxide shell mediated environmental remediation properties of nano zero-valent iron

Mu, Yi; Jia, Falong; Ai, Zhihui; Zhang, Lizhi

doi:10.1039/c6en00398b

Cited by 221 publications

(114 citation statements)

References 177 publications

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“…The fitting exercise produced R c = 19 nm and R t = 27 nm, which produces a shell length of 8 nm. This thickness is certainly consistent with an NZVI observed within 6 h after being synthesized [39]. This suggests that the behavior of the surface of NZVI should approximate the behavior of iron oxide nanoparticles, and also that the interactions of surfactants with the NZVI surface might be similar to that of surfactants with iron oxide.…”

Section: Dispersion Of Nzvi Suspensions With Surfactantssupporting

confidence: 80%

“…Zero-valent iron nanoparticles often have a layer of iron oxide, particularly when prepared by the aqueous borohydrate reduction used in this work. The thickness of the iron oxide layer of freshly prepared NZVI is close to 3 nm, and after 2 h of aging it can reach 6.5 nm, as determined via TEM images [39]. Yuvakkumar et al also indicated that the presence of iron oxide can be assessed via TEM images [40].…”

Section: Dispersion Of Nzvi Suspensions With Surfactantsmentioning

confidence: 99%

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Effect of Surfactants on Zero‐Valent Iron Nanoparticles (NZVI) Reactivity

Wang

Choi

Acosta

2017

J Surfact & Detergents

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Zero-valent iron nanoparticles (NZVI) were synthesized and dispersed in solutions of sodium oleate (SO), sodium laurate (SL), sodium dodecyl phosphonate (SDP), and sodium dodecyl sulfate (SDS). The reactivity of these dispersions was evaluated to assess the impact of surfactants on the reduction rate of hydrophilic reactive black 5 (RB5) and hydrophobic carbon tetrachloride (CT) model contaminants. SO and SL, used at their critical micelle concentration (CMC), lowered the reduction rate of RB5 by two and three orders of magnitude, respectively. SO and SL also decreased the reduction rate of CT by up to one order of magnitude. SDS and SDP, at their CMC, decreased the reduction rate of RB5 by approximately 50-fold, but increased the reduction rate of CT. The decrease in RB5 reduction rate might be explained by the formation of adsorbed surfactant species on the surface of NZVI that could hinder the transport of RB5 and other hydrophilic species. For SO and SL, the inhibition of RB5 and CT reduction might also be explained by the binding of carboxylates to NZVI. The increase in CT reduction rate with SDS and SDP suggests that providing a non-binding lipophilic environment on the surface of NZVI would improve the reduction rate and selectivity towards the reduction of hydrophobic contaminants.

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Section: Dispersion Of Nzvi Suspensions With Surfactantssupporting

confidence: 80%

Section: Dispersion Of Nzvi Suspensions With Surfactantsmentioning

confidence: 99%

Effect of Surfactants on Zero‐Valent Iron Nanoparticles (NZVI) Reactivity

Wang

Choi

Acosta

2017

J Surfact & Detergents

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“…It has a small size for in situ injection and dispersion, large surface area, and high surface reactivity for metal‐ion reduction and immobilization. The unique core–shell structure imparts nZVI the versatile properties of reduction by metallic iron and sorption via iron oxides …”

Section: Introductionmentioning

confidence: 99%

Enrichment of Precious Metals from Wastewater with Core–Shell Nanoparticles of Iron

2018

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Large-scale deployment of zero-valent iron nanoparticles for enrichment and recovery of gold from industrial wastewater is reported. Iron nanoparticles have a core-shell structure in which a metallic iron core is enclosed with a thin layer of iron oxides/hydroxides. The two nanocomponents offer synergistic functions for rapid separation, enrichment, and stabilization of metal ions such as Au, Ag, Ni, and Cu. Thanks to the advantages of small size, large surface area, and high reactivity, only a small amount of iron nanoparticles are needed. The recovered nanoparticles thus contain precious metals well above conventional metal ores (e.g., >100 g Au ton ). Cost-effective recovery of precious metals from trace-level sources such as wastewater looks promising.

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“…Besides this fact, the catalytic activities of heterogeneous Fenton systems depend on numbers of other parameters; mainly solution pH, catalyst dosage, substrate concentration, H 2 O 2 concentration and reaction time. [9][10][11] In the recent years, magnetic nanoparticles with low iron dissolution have gained attention as a catalyst for the degradation of organic dyes due to their remarkable features such as a large specic surface area and easy recovery of catalyst. 12 The application of magnetic Fe 3 O 4 particles are limited in different media as it has less number of surface active functional groups, tend to aggregate, formation of clusters and iron leaching which reduce their activity and stability.…”

Section: Introductionmentioning

confidence: 99%

Novel highly stable β-cyclodextrin fullerene mixed valent Fe-metal framework for quick Fenton degradation of alizarin

Gogoi

Navgire²,

Sarma

et al. 2017

RSC Adv.

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b-Cyclodextrin (b-CD) supported magnetic nanoscaled fullerene/Fe 3 O 4 (CDFMNPs) and fullerene/Fe 3 O 4 (FMNPs) composites were prepared and characterized. These composites can be utilized as heterogeneous catalysts for the Fenton oxidation reaction to degrade alizarin in aqueous solutions. The saturation magnetization (M s ) value of quasi-spherical CDFMNPs was found to be 13.16 emu g À1 and their diameter was in the range of 25-30 nm. The catalytic activities of the prepared materials were tested with varying conditions of pH, amount used and the concentration of H 2 O 2 for degradation of alizarin at room temperature. The exceptionally high degradation efficiency of CDFMNPs was observed for alizarin at pH 3 with 2.0 g L À1 catalyst and 25 mM of H 2 O 2 . The increased oxidative degradation efficiency is attributed mainly to the formation of active hydroxyl radicals (cOH) on the surface of the catalyst, which are generated by the active decomposition of H 2 O 2 by the solid heterogeneous catalyst and the promoting effect of b-CD. CDFMNPs can be magnetically separated and the catalyst was found to be reusable and stable for five successive runs with no significant loss of catalytic activity. In the magnetic environment of Fe 3 O 4 nanoparticles, fullerene has a crucial role to enhance the activity by increasing the stability with nominal iron leaching. Based on mass analysis of alizarin degradation, the formation of aliphatic acids and monocyclic compounds through phthalic anhydride and di-methyl phthalate established the proposed degradation path.

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Iron oxide shell mediated environmental remediation properties of nano zero-valent iron

Abstract: Nano zero-valent iron (nZVI) has attracted much more attention for its potential applications in the fields of environmental contaminant remediation and detoxification.

Cited by 221 publications

References 177 publications

Effect of Surfactants on Zero‐Valent Iron Nanoparticles (NZVI) Reactivity

Effect of Surfactants on Zero‐Valent Iron Nanoparticles (NZVI) Reactivity

Enrichment of Precious Metals from Wastewater with Core–Shell Nanoparticles of Iron

Novel highly stable β-cyclodextrin fullerene mixed valent Fe-metal framework for quick Fenton degradation of alizarin

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