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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Simultaneous Sequestration of Humic Acid-Complexed Pb(II), Zn(II), Cd(II), and As(V) by Sulfidated Zero-Valent Iron: Performance and Stability of Sequestration Products

Environmental Science & Technology, Год журнала: 2022, Номер 56(5), С. 3127 - 3137

Опубликована: Фев. 17, 2022

Heavy metal(loid)s (HMs) such as Pb(II), Zn(II), Cd(II), and As(V) are ubiquitously present in co-contaminated soil shallow groundwater, where the humic acid (HA)-rich environments can significantly influence their sequestration. In this study, sulfidated zero-valent iron (S-ZVI) was found to be able simultaneously sequestrate these HA-complexed HMs. Specially, could completely removed by S-ZVI within 60 min, while only 35–50% of them sequestrated 72 h unsulfidated ZVI. Interestingly, different from corrosion behavior, kinetics HM sequestration consisted an initial slow reaction stage (or a lag phase) then fairly rapid process. Characterization results indicated that forming metal sulfides controlled at first stage, whereas enhanced ZVI thus-improved adsorption and/or coprecipitation hydroxides governed second stage. Both metal–oxygen metal–sulfur bonds solid phase confirmed X-ray photoelectron spectroscopy extended absorption fine structure analysis. Moreover, transformation S species SO42–, SO32–, S22– S2– under reducing conditions allow HMs remain stable over long period.

Язык: Английский

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Oxalated zero valent iron enables highly efficient heterogeneous Fenton reaction by self-adapting pH and accelerating proton cycle

Water Research, Год журнала: 2023, Номер 235, С. 119828 - 119828

Опубликована: Март 2, 2023

Язык: Английский

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Doped Cu0 and sulfidation induced transition from R-O• to •OH in peracetic acid activation by sulfidated nano zero-valent iron-copper

Water Research, Год журнала: 2024, Номер 256, С. 121621 - 121621

Опубликована: Апрель 20, 2024

Язык: Английский

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Biochar supporting and sulfidation synergistically affect reactivity of nanoscale zerovalent iron towards sulfamethoxazole

Chemical Engineering Journal, Год журнала: 2025, Номер 505, С. 159087 - 159087

Опубликована: Янв. 9, 2025

Язык: Английский

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Integrated application of nanoscale zero-valent iron for sulfide and methane control in sewers and improved wastewater treatment

Water Research, Год журнала: 2025, Номер 276, С. 123248 - 123248

Опубликована: Фев. 5, 2025

Sewer systems are critical water infrastructures for sewage collection and transportation services but frequently challenged by odour nuisance, corrosion greenhouse gas emissions, primarily driven sulfide methane production. This study investigated the effectiveness of multifunctional nanoscale zero-valent iron (nZVI) in controlling methane, along with its downstream impacts on wastewater treatment. Two continuous flow laboratory-scale reactor were used: sewer reactors sequencing batch (SBRs). Intermittent doses 50 mg Fe/L nZVI introduced daily a 6-h cycle experimental reactors. Results indicated reduced (by 8.5±0.5 S/L during dosing; 4.2±0.6 off-dosing) 16.6±1.9 COD/L 12.6±1.3 concentrations compared to control. reduction involved removal (0.12±0.01 g S/g Fe or 0.20±0.02 mol S/mol Fe) inhibition microbial sulfate-reducing methanogenic activities. Sulfate-reducing bacteria (SRB) archaea (MA) activities exhibited dynamic long-term addition (SRB: 58 % after first dose, 21 3 months; MA: 27 39 %). Additionally, sewer-dosed improved phosphorus (0.42±0.04 P/mg 0.76±0.07 P/mol enhanced sludge settleability dewaterability. These findings highlight potential intermittent dosing effective control sewers while delivering benefits integrated urban management.

Язык: Английский

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Biochar-supported nZVI for the removal of Cr(VI) from soil and water: Advances in experimental research and engineering applications

Journal of Environmental Management, Год журнала: 2022, Номер 316, С. 115211 - 115211

Опубликована: Май 11, 2022

Язык: Английский

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Enhanced reductive degradation of tetrabromobisphenol A by biochar supported sulfidated nanoscale zero-valent iron: Selectivity and core reactivity

Applied Catalysis B Environment and Energy, Год журнала: 2022, Номер 324, С. 122246 - 122246

Опубликована: Дек. 2, 2022

Язык: Английский

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Efficient degradation of sulfamethazine in a silicified microscale zero-valent iron activated persulfate process

Applied Catalysis B Environment and Energy, Год журнала: 2022, Номер 312, С. 121418 - 121418

Опубликована: Апрель 21, 2022

Язык: Английский

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Molecular Structure and Sulfur Content Affect Reductive Dechlorination of Chlorinated Ethenes by Sulfidized Nanoscale Zerovalent Iron

Environmental Science & Technology, Год журнала: 2022, Номер 56(9), С. 5808 - 5819

Опубликована: Апрель 20, 2022

Sulfidized nanoscale zerovalent iron (SNZVI) with desirable properties and reactivity has recently emerged as a promising groundwater remediation agent. However, little information is available on how the molecular structure of chlorinated ethenes (CEs) affects their dechlorination by SNZVI or whether sulfur content can alter pathway reactivity. Here, we show that (up to 30-fold) selectivity 70-fold) improvements (compared NZVI) toward CEs depended chlorine number, position, content. Low (i.e., vinyl chloride cis-1,2-dichloroethene) high (perchloroethene) tended be dechlorinated primarily via atomic H direct electron transfer, respectively, while could efficiently selectively dechlorinate trichloroethene trans-1,2-dichloroethene both pathways. Increasing sulfidation degree suppressed its ability produce but promoted transfer thus altered relative contributions CE dechlorination, resulting in different reactivities selectivities. These were indicated correlations rates descriptors, H2 evolution rates, indicators SNZVI. mechanistic insights indicate importance determining structure-specific materials target contaminants lead more rational design for situ various CEs.

Язык: Английский

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