Sulfidated nano-scale zerovalent iron is able to effectively reduce in situ hexavalent chromium in a contaminated aquifer

Brumovský, Miroslav; Oborná, Jana; Lacina, Petr; Hegedüs, Michal; Šráček, Ondra; Kolařík, J; Petr, Martin; Kašlík, Josef; Hofmann, Thilo; Filip, Jan

doi:10.1016/j.jhazmat.2020.124665

Cited by 54 publications

(14 citation statements)

References 64 publications

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“…Especially, the removal efficiency of S-nZVI@H is 24.89% higher than that of nZVI@H at the 5th minute. During the reaction of Cr(VI) and S-nZVI@H, the sulfur species FeS enhances the transfer of electrons from the core to the surface of nZVI, thus increasing the probability of Cr(VI) reduction (Li et al 2018a;Brumovský et al 2021). Brumovský et al (2021) verified that S-nZVI was more effective in removing Cr(VI) than nZVI in laboratory conditions.…”

Section: Comparison Of Removal Of Cr(vi) Between Nzvi@h and S-nzvi@hmentioning

confidence: 84%

“…During the reaction of Cr(VI) and S-nZVI@H, the sulfur species FeS enhances the transfer of electrons from the core to the surface of nZVI, thus increasing the probability of Cr(VI) reduction (Li et al 2018a;Brumovský et al 2021). Brumovský et al (2021) verified that S-nZVI was more effective in removing Cr(VI) than nZVI in laboratory conditions. Additionally, Su et al (2015a) reported that S-nZVI had higher surface area rather than bare nZVI generating more metal ion adsorption binding sites.…”

Section: Comparison Of Removal Of Cr(vi) Between Nzvi@h and S-nzvi@hmentioning

confidence: 84%

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Response surface design for removal of Cr(VI) by hydrogel-supported sulfidated nano zero-valent iron (S-nZVI@H)

You

Tong

et al. 2021

Water Science and Technology

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In this study, a new sulfidated nanoscale zero valent iron (S-nZVI) supported on hydrogel (S-nZVI@H) was successfully synthesized for the removal of Cr(VI) from groundwater. The surface morphology, dispersion phenomenon and functional groups of novel S-nZVI@H were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Box-Behnken design (BBD) optimization technology based on response surface methodology (RSM) is applied to demonstrate the influence of the interaction of S-nZVI@H dose, initial Cr(VI) concentration, contact time, and initial pH with the Cr(VI) removal efficiency. The AVOVA results (F = 118.73, P < 0.0001, R2 = 0.9916) show that the quadratic polynomial model is significant enough to reflect the close relationship between the experimental and predicted values. The predicted optimum removal conditions are determined to be as follows: S-nZVI@H dose 9.46 g/L, initial Cr(VI) concentration 30 mg/L, contact time 40.7 min and initial pH 5.27, and the S-nZVI@H dose is the key factor affecting the removal of Cr(VI). The predicted value (99.76%) of Cr (VI) removal efficiency is in good agreement with the experimental value (97.75%), which verifies the validity of the quadratic polynomial model. This demonstrates that RSM with appropriate BBD can be considerably utilized to optimize the design of experiments for removal of Cr(VI).

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Section: Comparison Of Removal Of Cr(vi) Between Nzvi@h and S-nzvi@hmentioning

confidence: 84%

Section: Comparison Of Removal Of Cr(vi) Between Nzvi@h and S-nzvi@hmentioning

confidence: 84%

Response surface design for removal of Cr(VI) by hydrogel-supported sulfidated nano zero-valent iron (S-nZVI@H)

You

Tong

et al. 2021

Water Science and Technology

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“…Überlagerung der Cr-und Fe-Elementkartierung, (B) hochauflösende XPS Cr 2p-Spektren (angepasst von [7])…”

Section: Bild 1: Räumliche Entwicklung Der Cr(vi)-kontaminationsfahne: (A) Vor Der S-nzvi-zugabe (Juni 2018) (B) Zwei Monate Nach Der Zugunclassified

In‐situ‐Sanierung von Chrom(VI) mit sulfidiertem nanoskaligem nullwertigem Eisen

Brumovský¹,

Filip²,

Oborná³

et al. 2021

Vom Wasser

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“…ZVI and its modifications could effectively degrade or transform several water pollutants such as persistent pollutants [ 8 ], heavy metal [ 9 , 10 , 11 ], coloring dyestuff [ 12 ], and phosphate [ 13 ]. However, it is necessary to consider the corrosion of ZVI while focusing on the removal of contaminants, because there is a certain time interval between the synthesis and practical application of ZVI [ 1 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Spatial Distribution of nZVI on the Corrosion of nZVI Composites and Its Subsequent Cr(VI) Removal from Water

Huang

Song

et al. 2022

Nanomaterials

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There have been many studies on contaminant removal by fresh and aged nanoscale zero-valent iron (nZVI), but the effect of spatial distribution of nZVI on the corrosion behavior of the composite materials and its subsequent Cr(VI) removal remains unclear. In this study, four types of D201-nZVI composites with different nZVI distributions (named D1, D2, D3, and D4) were fabricated and pre-corroded in varying coexisting solutions. Their effectiveness in the removal of Cr(VI) were systematically investigated. The results showed acidic or alkaline conditions, and all coexisting ions studied except for H2PO4− and SiO32− enhanced the corrosion of nZVI. Additionally, the Cr(VI) removal efficiency was observed to decrease with increasing nZVI distribution uniformity. The corrosion products derived from nZVI, including magnetite, hematite, lepidocrcite, and goethite, were identified by XRD. The XPS results suggested that the Cr(VI) and Cr(III) species coexisted and the Cr(III) species gradually increased on the surface of the pre-corroded D201-nZVI with increasing iron distribution uniformity, proving Cr(VI) removal via a comprehensive process including adsorption/coprecipitation and reduction. The results will help to guide the selection for nZVI nanocomposites aged under different conditions for environmental decontamination.

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Sulfidated nano-scale zerovalent iron is able to effectively reduce in situ hexavalent chromium in a contaminated aquifer

Cited by 54 publications

References 64 publications

Response surface design for removal of Cr(VI) by hydrogel-supported sulfidated nano zero-valent iron (S-nZVI@H)

Response surface design for removal of Cr(VI) by hydrogel-supported sulfidated nano zero-valent iron (S-nZVI@H)

In‐situ‐Sanierung von Chrom(VI) mit sulfidiertem nanoskaligem nullwertigem Eisen

Effect of Spatial Distribution of nZVI on the Corrosion of nZVI Composites and Its Subsequent Cr(VI) Removal from Water

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