Aging Significantly Affects Mobility and Contaminant-Mobilizing Ability of Nanoplastics in Saturated Loamy Sand

Environmental Science & Technology, Год журнала: 2019, Номер 53(10), С. 5805 - 5815

Опубликована: Апрель 23, 2019

Plastic debris, in particular, microplastics and nanoplastics, is becoming an emerging class of pollutants global concern. Aging can significantly affect the physicochemical properties plastics, therefore, may influence fate, transport, effects these materials. Here, we show that aging by UV or O3 exposure drastically enhanced mobility contaminant-mobilizing ability spherical polystyrene nanoplastics (PSNPs, 487.3 ± 18.3 nm diameter) saturated loamy sand. Extended Derjaguin–Landau–Verwey–Overbeek calculations pH-dependent transport experiments demonstrated greater aged PSNPs was mainly result surface oxidation which increased not only charge negativity, but more importantly, hydrophilicity The contributed to their elevated abilities. Moreover, binding both nonpolar polar contaminants, further increasing PSNPs. Interestingly, versus compounds via distinctly different mechanisms: contaminants (tested using pyrene) modification polymeric structure exacerbated slow desorption kinetics; for (4-nonylphenol), induced changes also resulted irreversible adsorption through interactions, such as hydrogen bonding. findings underline significant on environmental fate implications nanoplastics.

Язык: Английский

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Insights into the mechanism of persulfate activation with nZVI/BC nanocomposite for the degradation of nonylphenol

Chemical Engineering Journal, Год журнала: 2016, Номер 311, С. 163 - 172

Опубликована: Ноя. 12, 2016

Язык: Английский

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Degradation, Metabolism, and Bound-Residue Formation and Release of Tetrabromobisphenol A in Soil during Sequential Anoxic–Oxic Incubation

Environmental Science & Technology, Год журнала: 2013, Номер 47(15), С. 8348 - 8354

Опубликована: Июль 8, 2013

Tetrabromobisphenol A (TBBPA) is one of the most commonly used flame retardants and has become an environmental contaminant worldwide. We studied fate (14)C-labeled TBBPA in soil under static anoxic (195 days) sequential (125 days)-oxic (70 conditions. During incubation, dissipated with a half-life 36 days, yielding four debromination metabolites: bisphenol (BPA) mono-, di-, tribrominated BPA. At end all brominated BPAs completely disappeared, leaving BPA (54% initial TBBPA) as sole detectable organic metabolite. dissipation was accompanied by trace mineralization (<1.3%) substantial bound-residue formation (35%), probably owing to chemical binding matter. Subsequent oxic incubation effective degrading accumulated (half-life 11 through (6%) (62%). However, 42% anoxically formed bound residues released lower BPAs, which were then persistent during incubation. Our results provide first evidence for release alteration redox environment indicate that anoxic-oxic approaches-considered remediation environments containing halogenated xenobiotics-do not remove xenobiotics from matrices.

Язык: Английский

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Degradation and Metabolism of Tetrabromobisphenol A (TBBPA) in Submerged Soil and Soil–Plant Systems

Environmental Science & Technology, Год журнала: 2014, Номер 48(24), С. 14291 - 14299

Опубликована: Ноя. 17, 2014

Contamination by tetrabromobisphenol A (TBBPA), the most widely used brominated flame retardant, is a matter of environmental concern. Here, we investigated fate and metabolites (14)C-TBBPA in submerged soil with an anoxic-oxic interface planted or not rice (Oryza sativa) reed (Phragmites australis) seedlings. In unplanted soil, TBBPA dissipation (half-life 20.8 days) was accompanied mineralization (11.5% initial TBBPA) substantial formation (60.8%) bound residues. Twelve (10 7 soil) were formed via four interconnected pathways: oxidative skeletal cleavage, O-methylation, type II ipso-substitution, reductive debromination. The presence seedlings strongly reduced bound-residue stimulated debromination O-methylation. Considerable radioactivity accumulated (21.3%) (33.1%) seedlings, mainly on roots. While hardly affected it enhanced greatly reducing half-life (11.4 increasing monomethyl (11.3%). impact aerobic anaerobic transformation wetland plants profile dynamics should be considered phytoremediation strategies risk assessments soils.

Язык: Английский

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Photoelectrocatalytic degradation of 4-nonylphenol in water with WO3/TiO2 nanotube array photoelectrodes

Chemical Engineering Journal, Год журнала: 2014, Номер 242, С. 162 - 169

Опубликована: Янв. 4, 2014

Язык: Английский

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A unified approach for including non-extractable residues (NER) of chemicals and pesticides in the assessment of persistence

Environmental Sciences Europe, Год журнала: 2018, Номер 30(1)

Опубликована: Дек. 1, 2018

All chemicals form non-extractable residues (NER) to various extents in environmental media like soil, sediment, plants and animals. NER can be quantified fate studies using isotope-labeled (such as 14C or 13C) tracer compounds. Previous definitions have led a mismatch of legislation state knowledge research: the are assumed either irreversibly bound degradation products at least parts these released. In latter assumption, soils sediments long-term source slowly released residues. We here present conceptual experimental modeling approach characterize provide guidance how they should considered persistence assessment pesticides. Three types experimentally discriminated: sequestered entrapped (type I), containing parent substance xenobiotic transformation both having potential released, which has indeed been observed. Type II that covalently organic matter biological tissue organisms being strongly with very low remobilization rates humic rates. III comprises biogenic (bioNER) after chemical anabolic formation natural biomolecules amino acids phospholipids, other biomass developed microbial turnover (MTB) model predict bioNER based on structural properties chemicals. Further, we proposed an extraction sequence obtain matrix only NER. Finally, summarized methods distinguish three types. I type potentially remobilizable but probability release is much lower than NER, i.e., soil “operationally spoken” minute amounts slow rates, if all. The evaluated by chemical, physical methods. BioNER no concern and, therefore, assessed such assessment. general concept presented consider total amount minus xenoNER, + II. If clear differentiation possible, for calculation half-life not degraded product(s). On contrary, may generally (at temporarily) removed. Providing proof most critical issue requires additional research. characterization information available, it recommended assess remobilizable. propose our unified evaluation implemented into hazard strategies REACH biocides, human veterinary pharmaceuticals, pesticides, irrespective different regulatory frameworks.

Язык: Английский

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Application of Conducting Polymer Nanostructures to Electrochemical Biosensors

Molecules, Год журнала: 2020, Номер 25(2), С. 307 - 307

Опубликована: Янв. 12, 2020

Over the past few decades, nanostructured conducting polymers have received great attention in several application fields, including biosensors, microelectronics, polymer batteries, actuators, energy conversion, and biological applications due to their excellent conductivity, stability, ease of preparation. In bioengineering field, were reported as matrixes for functionalization various molecules thus enhanced performances biosensors. addition, combinations metals or metal oxides nanostructures with result enhancing stability sensitivity biosensing platform. Therefore, methods been developing homogeneous metal/metal oxide thin layer on surfaces. This review will introduce fabrications different composites shapes. We exhibit techniques that can be used develop investigate chemical, physical topographical effects. Among we focus polymer-integrated electrochemical biosensors monitoring important targets such DNA, proteins, peptides, other biomarkers, addition cell-based chips. Furthermore, fabrication molecularly imprinted polymer-based addressed this review.

Язык: Английский

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Titanium dioxide and polypyrrole molecularly imprinted polymer nanocomposites based electrochemical sensor for highly selective detection of p-nonylphenol

Analytica Chimica Acta, Год журнала: 2019, Номер 1080, С. 84 - 94

Опубликована: Июнь 27, 2019

Язык: Английский

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Analysis, toxicity, occurrence and biodegradation of nonylphenol isomers: A review

Environment International, Год журнала: 2014, Номер 73, С. 334 - 345

Опубликована: Сен. 16, 2014

Over the last two decades, nonylphenols (NPs) have become to be known as a priority hazardous substance due primarily its estrogenicity and ubiquitous occurrence in environment. Nonylphenols are commonly treated single compound evaluation of their environmental occurrence, fate transport, treatment or toxicity. However, technical (tNPs) fact mixture more than 100 isomers congeners. Recent studies showed that some these behaved significantly differently biodegradability. The most estrogenic isomer was about 2 4 times active tNP. Moreover, half lives recalcitrant were 3 long those readily-biodegradable isomers. Negligence NP's specificity may result inaccurate assessment ecological health effects. In this review, we summarized recent publications on analysis, toxicity biodegradation NP at level highlighted future research needs improve our understanding isomer-specificity NP.

Язык: Английский

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Distribution of atrazine and its phytoremediation by submerged macrophytes in lake sediments

Chemosphere, Год журнала: 2016, Номер 168, С. 1515 - 1522

Опубликована: Дек. 5, 2016

Язык: Английский

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