Removal of hazardous dyes, toxic metal ions and organic pollutants from wastewater by using porous hyper-cross-linked polymeric materials: A review of recent advances

Journal of Environmental Management, Год журнала: 2021, Номер 287, С. 112360 - 112360

Опубликована: Март 20, 2021

Язык: Английский

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Recent Advances in Sulfidated Zerovalent Iron for Contaminant Transformation

Environmental Science & Technology, Год журнала: 2021, Номер 55(13), С. 8464 - 8483

Опубликована: Июнь 25, 2021

2021 marks 10 years since controlled abiotic synthesis of sulfidated nanoscale zerovalent iron (S-nZVI) for use in site remediation and water treatment emerged as an area active research. It was then expanded to microscale ZVI (S-mZVI) together with S-nZVI, they are collectively referred S-(n)ZVI. Heightened interest S-(n)ZVI stemmed from its significantly higher reactivity chlorinated solvents heavy metals. The extremely promising research outcomes during the initial period (2011-2017) led renewed (n)ZVI-based technologies treatment, explosion new last four (2018-2021) that is building understanding novel complex role sulfides enhancing (n)ZVI. Numerous studies have focused on exploring different approaches, colloidal, surface, (electrochemistry, contaminant selectivity, corrosion) properties. This review provides a critical overview recent milestones technology development: (i) clear insights into transformation long-term aging, (ii) impact sulfidation methods particle characteristics reactivity, (iii) broader range treatable contaminants, (iv) complete decontamination, (v) ecotoxicity, (vi) field implementation. In addition, this discusses major knowledge gaps future avenues opportunities.

Язык: Английский

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Iron and Sulfur Precursors Affect Crystalline Structure, Speciation, and Reactivity of Sulfidized Nanoscale Zerovalent Iron

Environmental Science & Technology, Год журнала: 2020, Номер 54(20), С. 13294 - 13303

Опубликована: Сен. 23, 2020

The reactivity of sulfidized nanoscale zerovalent iron (SNZVI) is affected by the amount and species sulfur in materials. Here, we assess impact Fe (Fe2+ Fe3+) S (S2O42–, S2–, S62–) precursors used to synthesize both NZVI SNZVI on resulting physicochemical properties selectivity with water trichloroethene (TCE). X-ray diffraction indicated that altered crystalline structure SNZVI. materials made from Fe3+ precursor had an expanded lattice Fe0 body-centered-cubic (BCC) lower electron-transfer resistance, providing higher (∼2–3 fold) TCE (∼5–13 than those Fe2+ precursor. choice controlled speciation particles, as absorption spectroscopy. Iron disulfide (FeS2) was main S2O42–, whereas sulfide (FeS) S2–/S62–. former more hydrophobic, reactive with, selective for compared latter These results suggest can be select conditions synthesis process provide selected (e.g., speciation, hydrophobicity, structure), reactivity,

Язык: Английский

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Sulfide-modified zero-valent iron activated periodate for sulfadiazine removal: Performance and dominant routine of reactive species production

Water Research, Год журнала: 2022, Номер 220, С. 118676 - 118676

Опубликована: Май 26, 2022

Язык: Английский

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Mechanistic insights into adsorptive and oxidative removal of monochlorobenzene in biochar-supported nanoscale zero-valent iron/persulfate system

Chemical Engineering Journal, Год журнала: 2020, Номер 400, С. 125811 - 125811

Опубликована: Июнь 9, 2020

Язык: Английский

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Sulfidized Nanoscale Zero-Valent Iron: Tuning the Properties of This Complex Material for Efficient Groundwater Remediation

Accounts of Materials Research, Год журнала: 2021, Номер 2(6), С. 420 - 431

Опубликована: Июнь 1, 2021

ConspectusGroundwater contamination by halogenated organic compounds, especially chlorinated and fluorinated ones, threatens freshwater sources globally. Nanoscale zero-valent iron (NZVI) has been extensively studied (>5000 publications) deployed for in situ groundwater remediation, but NZVI selectivity contaminants is poor, reactive lifetimes are short, it cannot promote defluorination reactions. Recently, sulfidized (SNZVI) emerged, revitalized academic industrial interests this material remediation. Sulfidation broadens the range of contaminants, significantly increases lifetime 2 orders magnitude, while inhibiting undesirable H2 evolution reaction between Fe0 water. This Account provides a state-of-the-art understanding chemical properties controlling reactivity SNZVI will advance field toward rational design efficient remediation materials.SNZVI complex mixture body-centered cubic (BCC) metallic unspecified sulfides. Most published research aimed at exploring breadth its various environmental rather than factors that influence materials. Recent works from our laboratory have tuning synthesis conditions to control amount speciation sulfur structure, elucidating how these structural changes result physicochemical (e.g., hydrophobicity, electron-transfer resistance, H adsorption sites) provide desirable important contaminants.This explains reasons more compared NZVI. The degradation pathways, sites (Fe or S species (direct electron transfer atomic H) dechlorination trichloroethene florfenicol determined batch experiments, theoretical calculations, analysis products. A better why with C–F bonds under ambient may also use derivatives emerging contaminants.Finally, guidance measuring reporting SNZVI. enable comparisons future studies elucidate differences synthesized different groups. Overall, unveils structure–property–performance relationships SNZVI, makes strides controlled robust tailored specific application scenarios, mechanistic insights into materials contaminants.

Язык: Английский

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Unveiling the Role of Sulfur in Rapid Defluorination of Florfenicol by Sulfidized Nanoscale Zero-Valent Iron in Water under Ambient Conditions

Environmental Science & Technology, Год журнала: 2021, Номер 55(4), С. 2628 - 2638

Опубликована: Фев. 2, 2021

Groundwater contamination by halogenated organic compounds, especially fluorinated ones, threatens freshwater sources globally. Sulfidized nanoscale zero-valent iron (SNZVI), which is demonstrably effective for dechlorination of groundwater contaminants, has not been well explored defluorination. Here, we show that SNZVI nanoparticles synthesized via a modified post-sulfidation method provide rapid (∼1100 μmol m–2 day–1) and relatively fast defluorination (∼6 emerging contaminant (florfenicol) under ambient conditions, the fastest rates have ever reported Fe0-based technologies. Batch reactivity experiments, material characterizations, theoretical calculations indicate coating S onto metallic Fe surface provides highly chemically reactive changes primary pathway from atomic H (NZVI) to electron transfer SNZVI. sites are responsible direct H-mediated reaction, respectively, β-elimination pathway. Notably, Cl atoms in florfenicol make more defluorination, either increasing adsorption or electronic effects. The rate ∼132–222 times higher with chlorine attached compared absence molecule. These mechanistic insights could lead new materials situ remediation contaminants.

Язык: Английский

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Increasing the electron selectivity of nanoscale zero-valent iron in environmental remediation: A review

Journal of Hazardous Materials, Год журнала: 2021, Номер 421, С. 126709 - 126709

Опубликована: Июль 21, 2021

Язык: Английский

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Current advances in microalgae-based bioremediation and other technologies for emerging contaminants treatment

The Science of The Total Environment, Год журнала: 2021, Номер 772, С. 144918 - 144918

Опубликована: Янв. 29, 2021

Язык: Английский

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Engineering Self‐Supported Hydrophobic–Aerophilic Air Cathode with CoS/Fe₃S₄ Nanoparticles Embedded in S, N Co‐Doped Carbon Plate Arrays for Long‐Life Rechargeable Zn–Air Batteries

Advanced Energy Materials, Год журнала: 2023, Номер 13(10)

Опубликована: Янв. 25, 2023

Abstract The highly sluggish kinetics of oxygen reduction/evolution reactions (ORR/OER) at air cathodes lead to problems such as low power density and unsatisfactory cycling life with rechargeable Zn–air batteries (RZABs). To engineer the reaction cathodes, a hydrophobic–aerophilic strategy is developed fabricate self‐supported cathode based on CoS/Fe 3 S 4 nanoparticles encapsulated in S, N co‐doped carbon plate arrays (CoS/Fe @SNCP). It experimentally shown that situ growth bimetallic sulfides improves intrinsic electrocatalytic activity electron conduction cathode. Meanwhile, ab initio molecular dynamics simulations reveal surface can repel water molecules create abundant solid–liquid–gas three‐phase interfaces well expose Fe‐sites, which consequently promote diffusion reactive molecules/ions across interface adsorption. As result, @SNCP electrode exhibits excellent OER ORR activities smaller potential gap 0.65 V. For engineered hydrophobicity catalyst, RZAB demonstrates high 272 mW cm −2 , narrow discharge/charge 0.75 V 10 mA long‐term stability over 1400 h, outperforming its hydrophilic CoS@SNCP counterparts.

Язык: Английский

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