High-efficiency photocatalytic CO2 reduction enabled by interfacial Ov and isolated Ti3+ of g-C3N4/TiO2 Z-scheme heterojunction

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 663, С. 891 - 901

Опубликована: Март 2, 2024

Язык: Английский

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PFAS-Contaminated Soil Site in Germany: Nontarget Screening before and after Direct TOP Assay by Kendrick Mass Defect and FindPFΔS

Environmental Science & Technology, Год журнала: 2023, Номер 57(16), С. 6647 - 6655

Опубликована: Апрель 14, 2023

Soil contaminations with per- and polyfluoroalkyl substances (PFAS) are of great concern due to their persistence, leading continuous, long-term groundwater contamination. A composite sample from contaminated agricultural soil northwestern Germany (Brilon-Scharfenberg, North Rhine-Westphalia) was investigated in depth nontarget screening (NTS) (Kendrick mass defect MS2 fragment differences FindPFΔS). Several years ago, selected PFCAs PFSAs were identified on this site by detection nearby surface drinking water. We 10 further PFAS classes 7 C8-based (73 single PFAS) previously unknown including some novel PFAS. All except for one class comprised sulfonic acid groups semi-quantified PFSA standards which ∼97% perfluorinated not expected be degradable. New identifications made up >75% the prior known concentration, estimated >30 μg/g. Pentafluorosulfanyl (-SF5) dominant (∼40%). Finally, oxidized direct TOP (dTOP) assay, revealing PFAA precursors that covered a large extent H-containing additional TPs (perfluoroalkyl diacids) detected after dTOP. In soil, however, dTOP + target analysis covers <23% occurring PFAS, highlighting importance NTS characterize more comprehensively.

Язык: Английский

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Further Insight into Extractable (Organo)fluorine Mass Balance Analysis of Tap Water from Shanghai, China

Environmental Science & Technology, Год журнала: 2023, Номер 57(38), С. 14330 - 14339

Опубликована: Сен. 15, 2023

The ubiquitous occurrence of per- and polyfluoroalkyl substances (PFAS) the detection unexplained extractable organofluorine (EOF) in drinking water have raised growing concerns. A recent study reported inorganic fluorinated anions German river systems, therefore, some samples, EOF may include anions. Thus, it might be more appropriate to use term "extractable fluorine (EF) analysis" instead analysis. In this study, tap samples (n = 39) from Shanghai were collected assess levels EF/EOF, 35 target PFAS, two (tetrafluoroborate (BF4-) hexafluorophosphate (PF6-)), novel PFAS through suspect screening potential oxidizable precursors oxidative conversion. results showed that ultra-short largest contributors accounting for up 97% ΣPFAS. To best our knowledge, was first time bis(trifluoromethanesulfonyl)imide (NTf2) China, p-perfluorous nonenoxybenzenesulfonate (OBS) also identified screening. Small amounts can oxidatively converted PFCAs noted after EF mass balance analysis revealed could only explain less than 36% EF. However, greatly reduced when BF4- PF6- included. These compounds further explained 44% EF, indicating role

Язык: Английский

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Production of perfluoroalkyl acids (PFAAs) from precursors in contaminated agricultural soils: Batch and leaching experiments

The Science of The Total Environment, Год журнала: 2023, Номер 902, С. 166555 - 166555

Опубликована: Авг. 24, 2023

Язык: Английский

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Investigation of pH-dependent extraction methods for PFAS in (fluoropolymer-based) consumer products: A comparative study between targeted and sum parameter analysis

Chemosphere, Год журнала: 2024, Номер 351, С. 141200 - 141200

Опубликована: Янв. 14, 2024

Here, we report a comparative study of different sum parameter analysis methods for the extraction per- and polyfluoroalkyl substances (PFAS) from manufactured consumer products, which can be measured by combustion ion chromatography (CIC). Therefore, hydrolysis-based method was further developed, accounts addition hydrolyzable covalently bound polyfluoroalkylated side-chain polymers (SFPs) to extractable organic fluorine portion mass balance proposed as "hydrolyzable organically fluorine" (HOF). To test this hypothesis, applied 39 products containing fluoropolymers or monomeric PFAS taken four categories: outdoor textiles, paper packaging, carpeting, permanent baking sheets. We also evaluated method's efficiency extracting synthesized fluorotelomer polyacrylate reference compounds. The total (TF) (EOF) values were through CIC using established protocols. TF ranged sub-ppb %-levels, depending on compound class. All samples showed results hydrolyzed organofluorine (HOF) between 0.03 76.3 μg/g, while most EOF lower (

Язык: Английский

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Bi-element gradient doped B/N-TiO2-x synthesized by one-step solvothermal method enhances the photocatalysis of Cr(VI)

Applied Surface Science, Год журнала: 2024, Номер 657, С. 159817 - 159817

Опубликована: Март 1, 2024

Язык: Английский

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Tracing per- and polyfluoroalkyl substances (PFASs) in the aquatic environment: Target analysis and beyond

TrAC Trends in Analytical Chemistry, Год журнала: 2023, Номер 169, С. 117351 - 117351

Опубликована: Окт. 11, 2023

Per- and polyfluoroalkyl substances (PFASs) have been manufactured used for decades. The aquatic environment is a critical transportation transformation compartment PFASs. Target analysis the most method of tracing PFASs in but powerless large amounts unknown This review summarizes advantages three target supplementary approaches, including extractable organofluorine (EOF) analysis, high-resolution mass spectrometry (HRMS) screening, PFAS precursor oxidative conversion. For known PFASs, more targets, emerging isomers, ultrashort-chain cationic/zwitterionic should be considered. organofluorines, developing comprehensive low-contaminated sample treatment strategies essential yet challenging. We propose screened via HRMS at CL 3 above EOF balance 4 samples collected from "known source". Appropriate approaches applied to investigate beyond comprehensively.

Язык: Английский

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PFAS in Landfill Leachate: Practical Considerations for Treatment and Characterization

Journal of Hazardous Materials, Год журнала: 2024, Номер unknown, С. 136685 - 136685

Опубликована: Ноя. 1, 2024

Язык: Английский

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Non-extractable PFAS in functional textiles – characterization by complementary methods: oxidation, hydrolysis, and fluorine sum parameters

Environmental Science Processes & Impacts, Год журнала: 2023, Номер 25(8), С. 1298 - 1310

Опубликована: Янв. 1, 2023

Per- and polyfluoroalkyl substances (PFAS) are widely used for durable water-repellent finishing of different fabrics textiles such as outdoor clothing, carpets, medical more. Existing PFAS extraction techniques followed by target analysis often insufficient detecting side-chain fluorinated polymers (SFPs) that barely or non-extractable. SFPs typically copolymers consisting a non-fluorinated backbone with perfluoroalkyl side-chains to obtain desired properties. We compared the accessible analytical information performance complementary based on oxidation (dTOP PhotoTOP assays), hydrolysis (THP assay), standard extraction, extractable organic fluorine (EOF), total (TF) five functional characterized 7 further only oxidation. The results show when applied directly textile samples, dTOP also (THP) able capture large fractions TF in form present while methods relying extracts (EOF, non-target analysis) yield much lower (e.g., factor ∼25-50 lower). conversion measured into PFCAs FTOHs from side chains is contrast previous studies. Concentrations ranged

Язык: Английский

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Cost-Effective and Highly Efficient Manganese-Doped MoS₂ Nanosheets as Visible-Light-Driven Photocatalysts for Wastewater Treatment

Langmuir, Год журнала: 2023, Номер 39(20), С. 7109 - 7121

Опубликована: Май 8, 2023

One of the main objectives in wastewater treatment and sustainable energy production is to find photocatalysts that are favorably efficient cost-effective. Transition-metal dichalcogenides (TMDs) promising photocatalytic materials; out all, MoS2 extensively studied as a cocatalyst TMD library due its exceptional activity for degradation organic dyes distinctive morphology, adequate optical absorption, rich active sites. However, sulfur ions on edges facilitate catalytic MoS2. On basal planes, catalytically inactive. Injecting metal atoms into lattice handy approach triggering surface planes enriching Effective band gap engineering, edges, improved absorption Mn-doped nanostructures improving their charge separation photostimulated dye activity. The percentage MB under visible-light irradiations was found be 89.87 100% pristine 20% 150 90 min, respectively. increased when doping concentration from 5 20%. kinetic study showed first-order model described photodegradation mechanism well. After four cycles, catalysts maintained comparable efficacy, indicating excellent stability. results demonstrated exhibit visible-light-driven could perform well catalyst industrial treatment.

Язык: Английский

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