Dynamic interactions between sulfidated zerovalent iron and dissolved oxygen: Mechanistic insights for enhanced chromate removal

Shao, Qianqian; Xu, Chao; Wang, Yahao; Huang, Shasha; Zhang, Bingliang; Huang, Lihui; Fan, Dimin; Tratnyek, Paul G.

doi:10.1016/j.watres.2018.02.030

Cited by 113 publications

(41 citation statements)

References 90 publications

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“…Conventionally, dynamic interactions between reactive materials (e.g., Fe 0 and FeS 2 .) and dissolved species (e.g., contaminants and O 2 ) are investigated by employing a suite of solution chemistry and solid-phase characterization approaches [49,86,[97][98][99][100]. The achieved results are then used to develop a time series correlation analysis justifying the contaminant removal or transformation in the Fe 0 /H 2 O system [99].…”

Section: Implications On Contaminant Removal Mechanismsmentioning

confidence: 99%

Validating the Efficiency of the FeS2 Method for Elucidating the Mechanisms of Contaminant Removal Using Fe0/H2O Systems

Xiao

Cui

et al. 2020

Processes

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There is growing interest in using pyrite minerals (FeS2) to enhance the efficiency of metallic iron (Fe0) for water treatment (Fe0/H2O systems). This approach contradicts the thermodynamic predicting suppression of FeS2 oxidation by Fe0 addition. Available results are rooted in time series correlations between aqueous and solid phases based on data collected under various operational conditions. Herein, the methylene blue method (MB method) is used to clarify the controversy. The MB method exploits the differential adsorptive affinity of MB onto sand and sand coated with iron corrosion products to assess the extent of Fe0 corrosion in Fe0/H2O systems. The effects of the addition of various amounts of FeS2 to a Fe0/sand mixture (FeS2 method) on MB discoloration were characterized in parallel quiescent batch experiments for up to 71 d (pH0 = 6.8). Pristine and aged FeS2 specimens were used. Parallel experiments with methyl orange (MO) and reactive red 120 (RR120) enabled a better discussion of the achieved results. The results clearly showed that FeS2 induces a pH shift and delays Fe precipitation and sand coating. Pristine FeS2 induced a pH shift to values lower than 4.5, but no quantitative MB discoloration occurred after 45 d. Aged FeS2 could not significantly shift the pH value (final pH ≥ 6.4) but improved the MB discoloration. The used systematic sequence of experiments demonstrated that adsorption and coprecipitation are the fundamental mechanisms of contaminant removal in Fe0/H2O systems. This research has clarified the reason why a FeS2 addition enhances the efficiency of Fe0 environmental remediation.

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Section: Implications On Contaminant Removal Mechanismsmentioning

confidence: 99%

Validating the Efficiency of the FeS2 Method for Elucidating the Mechanisms of Contaminant Removal Using Fe0/H2O Systems

Xiao

Cui

et al. 2020

Processes

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“…8a). The reason for this may be that 1,10-phenanthroline could form a complexation of Fe(II) that prevented Fe(II) from reducing Cr(VI) [47]. The removal capacity of Cr(VI) increased from 128 to 250 mg g -1 when EDTA was added to the Cr(VI) solution, which showed that EDTA enhanced Cr(VI) removal (Fig.…”

Section: Mechanism Of Cr(vi) Removal By Cu-nzvi/bcmentioning

confidence: 93%

Detoxification of Cr(VI) using biochar supported Cu/Fe bimetallic nanoparticles

Shao¹,

ShaoYu²,

Xu³

et al. 2019

DWT

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Nanoscale zero-valent iron (nZVI) has been proven to be more effective for the treatment of hexavalent chromium(Cr(VI)) when modified with the transition metal Cu. In this study, biochar-supported Cu/Fe bimetallic nanoparticles (Cu-nZVI/BC) were prepared and used for Cr(VI) removal from aqueous solution. The effects of the pH value, the initial concentration of Cr(VI), coexisting ions and humic acids (HA) were investigated. The compositional structures of Cu-nZVI/BC were analyzed by transmission electron microscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The maximum removal efficiency of Cr(VI) was 50.57% (126.41 ± 3.75 mg g-1) for Cu-nZVI/BC at pH 2. The adsorption kinetic data were in agreement with the pseudo-second-order model, which confirmed that the adsorption step was a chemical adsorption and reduction process. The presence of Ca 2+ and NO 3 had an inhibitory effect on Cr(VI) removal, while dHA increased the removal efficiency at high concentrations. This study proves that Cu-nZVI/BC removal of solution Cr(VI) is feasible and shows significant potential in practical applications.

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“…Recently, the research on contaminant removal by ZVI has greatly increased the dimensions of complexity in this area (Shao et al, 2018). Since Fe(II) and aerobic conditions are two of the most broadly relevant parameters, this section introduces the dynamic interactions between Fe(II) and O 2 on the reactivity and selectivity of ZVI towards Se(IV).…”

Section: Ferrous Ion Enhances the Reactivity And Selectivity Of Zvi Toward Se(vi) 531 Influence Of Fe(ii) On The Reactivity Of Zvi Towardmentioning

confidence: 99%

Reactivity and selectivity of zerovalent iron toward selenium oxyanions under aerobic conditions

Li¹,

Sun²,

Guan³

2021

Environmental Technologies to Treat Selenium Pollution

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Dynamic interactions between sulfidated zerovalent iron and dissolved oxygen: Mechanistic insights for enhanced chromate removal

Cited by 113 publications

References 90 publications

Validating the Efficiency of the FeS2 Method for Elucidating the Mechanisms of Contaminant Removal Using Fe0/H2O Systems

Validating the Efficiency of the FeS2 Method for Elucidating the Mechanisms of Contaminant Removal Using Fe0/H2O Systems

Detoxification of Cr(VI) using biochar supported Cu/Fe bimetallic nanoparticles

Reactivity and selectivity of zerovalent iron toward selenium oxyanions under aerobic conditions

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