Identification of Active Hydrogen Species on Palladium Nanoparticles for an Enhanced Electrocatalytic Hydrodechlorination of 2,4-Dichlorophenol in Water

Environmental Science & Technology, Год журнала: 2017, Номер 51(13), С. 7599 - 7605

Опубликована: Май 25, 2017

Clarifying hydrogen evolution and identifying the active species are crucial to understanding of electrocatalytic hydrodechlorination (EHDC) mechanism. Here, monodisperse palladium nanoparticles (Pd NPs) used as a model catalyst demonstrate potential-dependent evolutions three species, including adsorbed atomic (H*ads), absorbed (H*abs), molecular (H2) on Pd NPs, then their effect EHDC 2,4-dichlorophenol (2,4-DCP). Our results show that H*ads, H*abs, H2 all emerge at -0.65 V (vs Ag/AgCl) have increased amounts more negative potentials, except for H*ads exhibits reversed trend with potential varying from -0.85 -0.95 V. Overall, concentrations these evolve in an order H*abs < range V, -1.00 -1.10 By correlating each 2,4-DCP kinetics efficiency, we find is inert, while bubbles detrimental reaction. Accordingly, efficient reaction, moderate desired yield sufficient limit effect. work presents systematic investigation reaction mechanism catalysts, which should advance application technology practical environmental remediation.

Язык: Английский

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Neurotoxicity of polychlorinated biphenyls and related organohalogens

Acta Neuropathologica, Год журнала: 2019, Номер 138(3), С. 363 - 387

Опубликована: Апрель 11, 2019

Язык: Английский

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Analytical approaches for screening of per- and poly fluoroalkyl substances in food items: A review of recent advances and improvements

Environmental Pollution, Год журнала: 2023, Номер 329, С. 121705 - 121705

Опубликована: Апрель 26, 2023

Язык: Английский

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Organic contaminants in human breast milk identified by non-targeted analysis

Chemosphere, Год журнала: 2019, Номер 238, С. 124677 - 124677

Опубликована: Авг. 26, 2019

Язык: Английский

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Uptake and translocation of brominated flame retardants in tomato plants (Solanum lycopersicum L.): Results from a standard soil-based biotest

Chemosphere, Год журнала: 2024, Номер 353, С. 141594 - 141594

Опубликована: Март 1, 2024

The uptake and translocation of four polybrominated diphenyl ethers (PBDEs) novel brominated flame retardants (NBFRs) in tomato plants (Solanum lycopersicum L.) were investigated via the RHIZOtest, a standard soil-based biotest, optimized for organic compounds. Tomato exposed to soil samples spiked with 0 (i.e. control), 5.00 or 50.00 ng g−1dw each compound. Compared those control, exposure increasing spiking concentrations resulted average reductions 13% 26% (w/w) plant biomass. Higher NBFRs analyzed both roots, ranging from 0.23 8.01 PBDEs 1.25 18.51 NBFRs, shoots, 0.09 5.58 0.47 7.78 respectively. This corresponded an 5% 9% at lower soil-spiking level, 3% 6% higher level. Consequently, among initial levels, soil-root concentration factor (RCF) values on (0.13 ± 0.05 g dw roots) than (0.33 0.16 roots). Conversely, nondifferent root-shoot transfer (TF) calculated (0.54 0.13 roots shoots) (0.49 0.24 shoots). differences similarities reported RCF TF between within two groups compounds can be explained by their properties. exhibited decreasing trend as number bromine atoms increased. Additionally, robust negative linear correlation was observed respective logKow PBDEs, levels. root hydrophobicity; however, this not context root-to-shoot transfer. presence second aromatic ring appears key influencing variations biphenyl (BTBPE DBDPE) characterized reduced potential monophenyl PBEB HBB. Understanding these crops, especially near plastic recycling waste sites, is crucial understanding risks inclusion human food chain.

Язык: Английский

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A review of halogenated natural products in Arctic, Subarctic and Nordic ecosystems

Emerging contaminants, Год журнала: 2019, Номер 5, С. 89 - 115

Опубликована: Янв. 1, 2019

Halogenated natural products (HNPs) are organic compounds containing bromine, chlorine, iodine, and rarely fluorine. HNPs comprise many classes of compounds, ranging in complexity from halocarbons to higher molecular weight which often contain oxygen and/or nitrogen atoms addition halogens. Many biosynthesized by marine bacteria, macroalgae, phytoplankton, tunicates, corals, worms, sponges other invertebrates. This paper reviews Arctic, Subarctic Nordic ecosystems is based on sections Chapter 2.16 the Arctic Monitoring Assessment Program (AMAP) assessment Chemicals Emerging Concern (AMAP, 2017) deal with HNPs. Material updated expanded include more examples. Much chapter devoted "bromophenolic" HNPs, viz bromophenols (BPs) transformation bromoanisoles (BAs), hydroxylated methoxylated bromodiphenyl ethers (OH-BDEs, MeO-BDEs) polybrominated dibenzo-p-dioxins (PBDDs), since these most frequently reported. Others discussed 2,2′-dimethoxy-3,3′,5,5′-tetrabromobiphenyl (2,2′-dimethoxy-BB80), polyhalogenated 1′-methyl-1,2′-bipyrroles (PMBPs), 1,1′-dimethyl-2,2′-bipyrroles (PDBPs), N-methylpyrroles (PMPs), N-methylindoles (PMIs), bromoheptyl- bromooctyl pyrroles, (1R,2S,4R,5R,1′E)-2-bromo-1-bromomethyl-1,4-dichloro-5-(2′-chloroethenyl)-5-methylcyclohexane (mixed halogenated compound MHC-1), hexahydroxanthene derivatives (PBHDs) carbazoles (PHCs). Aspects covered physicochemical properties, sources production, processes, concentrations trends physical environment biota (marine freshwater). Toxic properties some a discussion how climate change might affect production distribution also included. The review concludes summary research needs better understand role as "chemicals emerging concern".

Язык: Английский

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Occurrence of Halogenated Organic Pollutants in Hadal Trenches of the Western Pacific Ocean

Environmental Science & Technology, Год журнала: 2020, Номер 54(24), С. 15821 - 15828

Опубликована: Ноя. 19, 2020

The hadal trenches are the most remote and inaccessible habitats on earth were once believed to be pristine. A recent study has reported detection of high levels persistent organic pollutants (POPs), including polybrominated diphenyl ethers (PBDEs) polychlorinated biphenyls (PCBs), in endemic amphipods from two (Mariana Kermadec) Western Pacific, implicating that indeed polluted. However, a fundamental question remains unanswered, if what extent such physical environment is polluted by POPs. In this study, we sampled Mariana, Mussau, New Britain analyzed samples amphipods, sediment, suspended particulate matter (SPM). Our results show contained elevated PCBs PBDEs, comparable those earlier study. We also detected significantly concentrations (up 1343 ng g–1 lw) chlorinated pesticides, as dichlorodiphenyltrichloroethanes chlordanes. Furthermore, four brominated natural products (BNPs), which structurally resembled methoxylated or biphenyls, identified amphipods. neither POPs nor BNPs sediments SPM. Taken together, propose likely resulted bioaccumulation feeding large detritus (e.g., carrion) falling trench bottoms surface ocean.

Язык: Английский

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Apex marine predators and ocean health: Proactive screening of halogenated organic contaminants reveals ecosystem indicator species

Chemosphere, Год журнала: 2019, Номер 221, С. 656 - 664

Опубликована: Янв. 9, 2019

Язык: Английский

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Toward an integrated framework for assessing micropollutants in marine mammals: Challenges, progress, and opportunities

Critical Reviews in Environmental Science and Technology, Год журнала: 2020, Номер 51(23), С. 2824 - 2871

Опубликована: Авг. 17, 2020

As apex predators, marine mammals play a key role in maintaining community structure and functioning ecosystems. Hence, decline mammal populations may have negative effects on the ecosystem function services. The discharge of anthropogenic chemicals particles (micropollutants) into environment threatens health mammals. Traditional approaches for assessing impact micropollutants are limited by complexity (e.g., low concentrations, unknown contaminants, transformation products, mixture effect) complex physiology, life history, multiple stressors, logistical challenges) environment. Recently developed (bio)analytical tools that can integrate chemical biological assessment such as non-target suspect screening, direct effect analysis, multiomics metabolomics, lipidomics, proteomics, transcriptomics) offer critical insights (i) risks 'known' 'unknown' mammals, (ii) link between exposure population effects, (iii) identification priority micropollutants. This review highlights challenges current progress risk posed to A tired integrated chemical-ecological-biological framework from research practices is offered effective micropollutant

Язык: Английский

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Characterization of Mining-Related Aromatic Contaminants in Active and Abandoned Metal(loid) Tailings Ponds

Environmental Science & Technology, Год журнала: 2020, Номер 54(23), С. 15097 - 15107

Опубликована: Ноя. 9, 2020

This study reports on the compositional diversity of organic compounds in metal(loid)-bearing tailings samples from both active and abandoned ponds. Tailings were qualitatively analyzed by comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GC × GC-TOFMS). In addition, priority PAHs (16), PAEs (6), phenols (2) quantitatively using chromatography–mass (GC-MS). We attribute presence some aromatic organics studied ponds to particular sources. Mineral floatation reagents are likely major sources small-ring aromatics ponds, products metallurgical processing burning fossil fuels mining area or further afield also possible contributors might be main source large-ring aromatics. found that for decades can still have concentrations at levels concern. Large-ring generally more toxic than other contaminants, these abundant suggests do not readily decompose biodegrade into less byproducts, as volatiles many compounds. Our contaminants database provides an important starting point researchers investigate compare similar present emphasizes necessity considering their transformations over time.

Язык: Английский

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