Effect of different sulfur precursors on efficient chromium(VI) removal by ZSM-5 zeolite supporting sulfide nano zero-valent iron

Zhou, Chundi; Han, Cuiping; Min, Xize; Yang, Ting

doi:10.1016/j.cej.2021.131515

Cited by 45 publications

(5 citation statements)

References 46 publications

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“…Besides, the XRD analysis also suggests that the lattice constant of the Fe 0 BCC structure expands to 2.865–2.867 Å by the nitridation (Figures b and S4b) compared to nZVI (2.861 Å). As a rule of thumb, a larger lattice constant means a larger interatomic distance, where the valence electrons tend to be released more readily, that is, a lower band energy gap and a faster electron transfer. , A similar phenomenon was also found in the sulfidation of Fe 0 when sulfur was incorporated into the Fe 0 BCC structure . This enlarged lattice is consistent with the result of the EIS measurement, which could assess the electron conduction performance of materials. , The Nyquist plot (Figure c) shows the smaller arc radii of the nitridated Fe 0 materials than that of nZVI (Figure c), suggesting their lower charge-transfer resistance .…”

Section: Resultssupporting

confidence: 74%

“…As a rule of thumb, a larger lattice constant means a larger interatomic distance, where the valence electrons tend to be released more readily, that is, a lower band energy gap and a faster electron transfer. 54,55 A similar phenomenon was also found in the sulfidation of Fe 0 when sulfur was incorporated into the Fe 0 BCC structure. 16 This enlarged lattice is consistent with the result of the EIS measurement, which could assess the electron conduction performance of materials.…”

Section: Resultssupporting

confidence: 59%

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Even Incorporation of Nitrogen into Fe⁰ Nanoparticles as Crystalline Fe₄N for Efficient and Selective Trichloroethylene Degradation

Meng

Dai

et al. 2022

Environ. Sci. Technol.

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Surface modification of microscale Fe powder with nitrogen has emerged recently to improve the reactivity of Fe0 for dechlorination. However, it is unclear how an even incorporation of a crystalline iron nitride phase into Fe0 nanoparticles affects their physicochemical properties and performance, or if Fe0 nanoparticles with a varied nitridation degree will act differently. Here, we synthesized nitridated Fe0 nanoparticles with an even distribution of N via a sol–gel and pyrolysis method. Nitridation expanded the Fe0 lattice and provided the Fe4N species, making the materials more hydrophobic and accelerating the electron transfer, compared to un-nitridated Fe0. These properties well explain their reactivity and selectivity toward trichloroethylene (TCE). The TCE degradation rate by nitridated Fe0 (up to 4.8 × 10–2 L m–2 h–1) was much higher (up to 27-fold) than that by un-nitridated Fe0, depending on the nitridation degree. The materials maintained a high electron efficiency (87–95%) due to the greatly suppressed water reactivity (109–127 times lower than un-nitridated Fe0). Acetylene was accumulated as the major product of TCE dechlorination via β-elimination. These findings suggest that the nitridation of Fe0 nanoparticles can change the materials’ physicochemical properties, providing high reactivity and selectivity toward chlorinated contaminants for in situ groundwater remediation.

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Section: Resultssupporting

confidence: 74%

Section: Resultssupporting

confidence: 59%

Even Incorporation of Nitrogen into Fe⁰ Nanoparticles as Crystalline Fe₄N for Efficient and Selective Trichloroethylene Degradation

Meng

Dai

et al. 2022

Environ. Sci. Technol.

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“…[22] Among these, the adsorption method is widely used in the cleaning of Cr (VI) contaminated water due to its wide range of raw materials and no by-products, easy recovery, simple operation, and high efficiency. The various adsorbents, including activated carbon, [23,24] zeolites, [25,26] clays, [27,28] doublelayered hydroxide, [29,30] chitosan, [18,31] conducting polymer, [7,32] biochar, [33,34] metal-organic frameworks, [35] graphene, [36,37] and metal phosphate, [12,13] had been utilized to remove Cr (VI) from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

2023

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The hexavalent chromium in water is extremely toxic to most living organisms and can cause many diseases. In this work, we developed Polypyrrole (PPy), Polypyrrole/graphene oxide (PPy/ GO) nanocomposite, and Polypyrrole/graphene oxide/zerovalent iron nanoparticles (PPy/GO/n-ZVI) nanocomposite for adsorption of Cr (VI) from water. PPy/GO nanocomposite showed the highest Cr (VI) removal capacity for 10 % (weight) loading of GO. PPy/GO/n-ZVI nanocomposite showed the highest Cr (VI) adsorption capacity for 50 % iron nanoparticle loading. Chemical kinetics data showed that Cr (VI) adsorption occurred with pseudo-second-order. The maximum adsorption capacity (q max ) was found to be 64.29 mg/g, 129.09 mg/g, and 171.04 mg/g on PPy, PPy/GO nanocomposite, and PPy/GO/n-ZVI nanocomposite respectively. The thermodynamic study showed a positive value of ΔS, and a negative value of ΔG indicated rise in the disorder at the adsorbate-adsorbent interface and spontaneous nature of Cr (VI) adsorption. ΔH was close to 21 kJ/mole indicating adsorption process occurred via physisorption. The recycling of the adsorbent was carried out by washing with sodium hydroxide and Cr (VI) removal efficiency decreased by around twenty % in the fifth cycle. The present study suggests that the PPy/GO/n-ZVI nanocomposite is an environment-friendly magnetic material and provides a simple, low-cost strategy for the adsorption of Cr (VI) from wastewater.

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“…The chemical reduction method [6] is commonly employed to remediate Cr(VI)-contaminated soil, with the critical process involving the conversion of highly toxic Cr(VI) to Cr(III) precipitate via reduction reactions using reducing agents such as FeSO 4 [6,7], Fe 0 [8][9][10], and CaS 4 [11][12][13]. This method effectively diminishes the migration ability and bioavailability of Cr(VI).…”

Section: Introductionmentioning

confidence: 99%

Adsorption-Reduction Behavior of Cr(VI) by Ferrihydrite-Fulvic Acid Complexes with Different C/Fe Mole Ratios

Zhang,

Chen,

et al. 2023

Adsorption Science & Technology

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Ferrihydrite and fulvic acid are prevalent components of soils and can significantly influence the environmental behavior of Cr(VI) in these matrices. Prior research has investigated the sorption behavior of Cr(VI) by ferrihydrite and fulvic acid independently; however, the sorption-reduction capacity of Cr(VI) by the ferrihydrite-fulvic acid complex, which is ubiquitously present in soils, has been less explored. In this study, ferrihydrite-fulvic acid complexes (Fh-FA) with varying C/Fe mole ratios were synthesized, and the adsorption-reduction behaviors of Cr(VI) on Fh-FA were examined using batch experiments, FTIR, BET, XRD, SEM-EDS, and XPS. The results demonstrate that the pseudo-second-order kinetic model can accurately describe the adsorption process of Fh-FA on Cr(VI), which can be delineated into three stages: rapid adsorption (0-30 min), slow adsorption (30-120 min), and reaction equilibrium (>120 min). The adsorption of Cr(VI) on Fh-FA primarily occurs through chemisorption. FTIR and XPS analyses revealed that Cr(VI) is initially adsorbed by Fe-OH on the Fh-FA surface. However, as the C/Fe mole ratio of Fh-FA increases, more Fe-OH is complexed by -COOH from FA, resulting in a decrease in the adsorption capacity of Cr(VI) by Fh-FA. The number of phenolic hydroxyl groups from FA also increases, providing additional electrons to reduce Cr(VI) to Cr(III) with increasing C/Fe mole ratio. This study not only emphasizes the adsorption-reduction behavior of Cr(VI) by ferrihydrite-fulvic acid complexes but also uncovers the interplay between C/Fe mole ratios and Cr(VI) adsorption-reduction, contributing to a more comprehensive understanding of the relative roles of Fe hydroxides and natural organic matter in soil environments. These findings have significant implications for Cr(VI) management in soils, enhancing our capability to protect and sustain the environmental quality.

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Effect of different sulfur precursors on efficient chromium(VI) removal by ZSM-5 zeolite supporting sulfide nano zero-valent iron

Cited by 45 publications

References 46 publications

Even Incorporation of Nitrogen into Fe⁰ Nanoparticles as Crystalline Fe₄N for Efficient and Selective Trichloroethylene Degradation

Even Incorporation of Nitrogen into Fe⁰ Nanoparticles as Crystalline Fe₄N for Efficient and Selective Trichloroethylene Degradation

Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

Adsorption-Reduction Behavior of Cr(VI) by Ferrihydrite-Fulvic Acid Complexes with Different C/Fe Mole Ratios

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Effect of different sulfur precursors on efficient chromium(VI) removal by ZSM-5 zeolite supporting sulfide nano zero-valent iron

Cited by 45 publications

References 46 publications

Even Incorporation of Nitrogen into Fe0 Nanoparticles as Crystalline Fe4N for Efficient and Selective Trichloroethylene Degradation

Even Incorporation of Nitrogen into Fe0 Nanoparticles as Crystalline Fe4N for Efficient and Selective Trichloroethylene Degradation

Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

Adsorption-Reduction Behavior of Cr(VI) by Ferrihydrite-Fulvic Acid Complexes with Different C/Fe Mole Ratios

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Even Incorporation of Nitrogen into Fe⁰ Nanoparticles as Crystalline Fe₄N for Efficient and Selective Trichloroethylene Degradation

Even Incorporation of Nitrogen into Fe⁰ Nanoparticles as Crystalline Fe₄N for Efficient and Selective Trichloroethylene Degradation