Nonmetallic modified zero-valent iron for remediating halogenated organic compounds and heavy metals: A comprehensive review DOI Creative Commons

Zimin Yan,

Jia Ouyang,

Bin Wu

et al.

Environmental Science and Ecotechnology, Journal Year: 2024, Volume and Issue: 21, P. 100417 - 100417

Published: March 21, 2024

Zero Valent Iron (ZVI), an ideal reductant treating persistent pollutants, is hampered by issues like corrosion, passivation, and suboptimal utilization. Recent advancements in nonmetallic modified ZVI (NM-ZVI) show promising potential circumventing these challenges modifying ZVI's surface internal physicochemical properties. Despite its promise, a thorough synthesis of research this domain remains elusive. Here we review the innovative methodologies, regulatory principles, reduction-centric mechanisms underpinning NM-ZVI's effectiveness against two prevalent pollutants: halogenated organic compounds heavy metals. We start evaluating different modification techniques, such as liquid-phase reduction, mechanical ball milling, pyrolysis, their respective advantages. The discussion progresses towards critical analysis current strategies used for NM-ZVI to enhance reactivity, electron selectivity, utilization efficiency. This achieved optimizing elemental compositions, content ratios, lattice constants, hydrophobicity, conductivity. Furthermore, propose novel approaches augmenting capability address complex pollution challenges. highlights alternative remediate water environments contaminated with or metals, contributing broader discourse on green remediation technologies.

Language: Английский

Dechlorination Helps Defluorination: Insights into the Defluorination Mechanism of Florfenicol by S-nZVI and DFT Calculations on the Reaction Pathways DOI
Zhenhuan Chen, Jingdan Chen,

Shendong Tan

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(5), P. 2542 - 2553

Published: Jan. 23, 2024

Defluorination is essential to eliminate the antibiotic resistance and detrimental effects of florfenicol (C12H14Cl2FNO4S, FF), which achievable by sulfidated nanoscale zerovalent iron (S-nZVI), yet a comprehensive understanding mechanism lacking. Herein, we used experimental data density functional theory calculations demonstrate four dechlorination-promoted defluorination pathways FF, depending on S-nZVI or not. FF was defluorinated in rapid then slow but continuous manner, accompanying consecutive dechlorination deschloro (dFF) dideschloro (ddFF). Unexpectedly, predominant occurs spontaneous hydrolysis ddFF form hydrolyzed byproduct (HO-ddFF), i.e., independent S-nZVI, initiated intramolecular attack from carbonyl O alkyl F thus limited for dFF owing diminished nucleophilicity electron-withdrawing Cl. The removal Cl also makes reductive amenable. other two minor more occur synergy with dFF, are mediated reactive carbanion intermediates generate HO-dFF HO-ddFF, respectively. reliability these dechlorination-facilitated verified consistency theoretical data, providing valuable insights into degradation fluorinated contaminants.

Language: Английский

Citations

17
Lattice-sulfur-impregnated zero-valent iron crystals for long-term metal encapsulation DOI
C.P. Chen,

Qianhai Zhou,

Zhongyuan Guo

et al.

Nature Sustainability, Journal Year: 2024, Volume and Issue: 7(10), P. 1264 - 1272

Published: Aug. 7, 2024

Language: Английский

Citations

14
Impacts of Perfluoroalkyl Substances on Aqueous and Nonaqueous Phase Liquid Dechlorination by Sulfidized Nanoscale Zerovalent Iron DOI
Du Chen, HU Xiao-hong, C.P. Chen

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(25), P. 11193 - 11202

Published: June 11, 2024

Per- and poly fluoroalkyl substances (PFASs) are often encountered with nonaqueous phase liquid (NAPL) in the groundwater at fire-fighting military training sites. However, it is unclear how PFASs affect dechlorination performance of sulfidized nanoscale zerovalent iron (S-nFe0), which an emerging promising NAPL remediation agent. Here, S-nFe0 synthesized controllable S speciation (FeS or FeS2) were characterized to assess their interactions for trichloroethylene (TCE-NAPL). Surface-adsorbed blocked materials' reactive sites inhibited aqueous TCE dechlorination. In contrast, PFASs-adsorbed particles improved hydrophobicity tended enrich NAPL–water interface, re-exposed after accumulation into accelerate This PFASs-induced phenomenon allowed materials present a higher reactivity (up 1.8-fold) high electron efficiency 99%) TCE-NAPL Moreover, nFe0-FeS2 was more readily enriched interface selective than nFe0-FeS, regardless coexisting PFASs. These results unveil that small amount yet previously overlooked can favor reductions by S-nFe0, highlighting importance transportation induced remediation.

Language: Английский

Citations

13
Mechanochemical nitridation of micron zero-valent iron for enhanced dechlorination of trichloroethylene: Mechanistic insights into nitrogen sources and ball milling conditions DOI

Yinghao Shi,

Dong Wang,

Feilong Gao

et al.

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 337, P. 126381 - 126381

Published: Jan. 14, 2024

Language: Английский

Citations

11
Nonmetallic modified zero-valent iron for remediating halogenated organic compounds and heavy metals: A comprehensive review DOI Creative Commons

Zimin Yan,

Jia Ouyang,

Bin Wu

et al.

Environmental Science and Ecotechnology, Journal Year: 2024, Volume and Issue: 21, P. 100417 - 100417

Published: March 21, 2024

Zero Valent Iron (ZVI), an ideal reductant treating persistent pollutants, is hampered by issues like corrosion, passivation, and suboptimal utilization. Recent advancements in nonmetallic modified ZVI (NM-ZVI) show promising potential circumventing these challenges modifying ZVI's surface internal physicochemical properties. Despite its promise, a thorough synthesis of research this domain remains elusive. Here we review the innovative methodologies, regulatory principles, reduction-centric mechanisms underpinning NM-ZVI's effectiveness against two prevalent pollutants: halogenated organic compounds heavy metals. We start evaluating different modification techniques, such as liquid-phase reduction, mechanical ball milling, pyrolysis, their respective advantages. The discussion progresses towards critical analysis current strategies used for NM-ZVI to enhance reactivity, electron selectivity, utilization efficiency. This achieved optimizing elemental compositions, content ratios, lattice constants, hydrophobicity, conductivity. Furthermore, propose novel approaches augmenting capability address complex pollution challenges. highlights alternative remediate water environments contaminated with or metals, contributing broader discourse on green remediation technologies.

Language: Английский

Citations

11