Published: Jan. 1, 2024
Language: Английский
Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(35), P. 47974 - 47990
Published: July 17, 2024
This study investigated the role of ultraviolet (UV) radiation and oxidation in high-density polyethylene microplastics (2-15 μm) nanoplastics (0.2-9.9 (NMPs) on particle chemistry, morphology, reactivity with cadmium (Cd). Additionally, toxicity NMPs alone Cd was evaluated using RTgutGC cells, a model rainbow trout (Oncorhynchus mykiss) intestine. The bioaccumulation cells also evaluated. Dynamic light scattering indicated that after UV NPs agglomerated size increased from 0.8 to 28 µm, 8 µm when added. Oxidized MPs 11 7 46 27 non-UV- UV-aged oxidized adding Cd, respectively. Cd-coated particles exhibited generally significantly higher zeta potential than non-Cd-coated particles, while attenuated total reflectance-Fourier transform infrared spectroscopy showed functional chemistry modified being exposed radiation. Presence resulted significant decrease (100.5-87.9 ng Cd/mg protein) compared (138.1 protein), although this not quite for co-exposures (105.7 protein). No observed 24 h. Moreover, reduce Cd. Altogether these results show aging enhances NMP surface reactivity, increasing absorption solution, which reduction bioavailability toxicity.
Language: Английский
Citations
6
Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown
Published: March 8, 2025
The escalating environmental concern over secondary microplastics (SMPs) stems from their physicochemical evolution primary (PMPs), yet the contribution of varying transformations to ultimate risks remains unknown. In this study, a photomechanical degradation process was employed convert sunscreen-derived (SDMPs) into SDMPs. While mechanical caused physical fragmentation, photodegradation induced both and chemical alterations, introducing surface oxidation, bond scission, cross-linking Employing combination alkaline digestion pyrolysis GC-MS techniques, it observed that fragmentation photooxidation led heightened intracellular sequestration MPs. Although bioaccumulated SDMPs could be indicated by enlarged lysosomes fragmented mitochondria, toxicity at cellular level primarily driven post-photodegradation. A nontargeted analysis employing high-resolution mass spectrometry identified 46 plastic-associated compounds in leachate, with photodegradation-induced playing crucial role dissociation hydrophobic additives oxidative conversion leached compounds. leachate exacerbated photodegradation, mitochondrial serving as subcellular biomarker, indicative toxicity. This study elucidates pivotal augmenting cytotoxicity SDMPs, shedding light on intricate interplay between risks.
Language: Английский
Citations
0
Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown
Published: April 8, 2025
Coastal wetlands function as critical retention zones for environmental microplastics, potentially accelerating their degradation through unique hydrological conditions. This study conducted a comprehensive 24-month in situ experiment at the Chongming Dongtan National Nature Reserve, examining weathering processes of five morphologically distinct polyethylene (PE), polypropylene (PP), and polystyrene (PS) microplastics. Quarterly analyses revealed progressive surface deterioration all microplastics after initial exposure, followed by polymer-specific fragmentation patterns pollutant adherence. Surface elemental analysis showed rising O/C ratios, with intertidal exhibiting higher variance (0.0014-0.0096 vs 0.0006-0.0028 supratidal). Carbonyl index (CI) displayed fluctuating increases, PS showing highest CI rise (75.75%/year 61.77%/year Systematic comparisons identified three determinants: enhanced from mechanical-photochemical synergy; spherical particles degrading faster than films via larger area; polymer vulnerabilities dictating > PP PE rates. These findings demonstrate that microplastic coastal is collectively governed conditions, particle morphology, composition, providing crucial quantitative parameters assessing persistence ecological risks these sensitive transition ecosystems.
Language: Английский
Citations
0
Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 116645 - 116645
Published: April 1, 2025
Language: Английский
Citations
0
Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown
Published: April 28, 2025
Although previous studies have extensively explored the release of microplastics from masks, specific influence inorganic additives on microplastic emissions has remained unidentified. Herein, we performed a comparative analysis medical face masks (MFMs) with calcium carbonate (CaCO3) against those devoid CaCO3 to understand their roles in release. Briefly, our investigation employed surface-enhanced Raman spectroscopy (SERS) examine micro- and nanoplastic release, while stereoscopic characterization mixing states was accomplished through simulated scattering (SRS). We also pioneered three-dimensional imaging (3D imaging) method for investigating internal aging plastic using SRS, which clearly revealed link between inside polymers photoaging. found that substantially accelerate photoaging materials multiple pathways induce more small-sized microplastics. Follow-up radical quenching experiments confirmed radicals as main cause this phenomenon. Our research exposes hazardous potential amplify emission
Language: Английский
Citations
0
Journal of Applied Polymer Science, Journal Year: 2025, Volume and Issue: unknown
Published: April 30, 2025
ABSTRACT With increasing safety concerns of synthetic antioxidants, completely or partially substituting these compounds with natural ones is a potentially feasible approach. However, the stabilization effectiveness antioxidants alone was usually limited. In this work, it found that combination vitamin E (VE), antioxidant, hindered phenol antioxidant 1010 significantly enhanced thermal‐oxidative stability polypropylene (PP). The samples 0.2% VE and had an oxidation induction time (OIT) 6.3 20.5 min, respectively, while same total addition amount (0.1% 0.1% VE) markedly prolonged OIT to 55.5 min. results melt flow rate yellowing index alterations following processing‐induced aging carbonyl changes after oven indicated exhibited pronounced synergistic effect. Mechanistic research suggested effect attributable regeneration by 1010. This mechanism further demonstrated another 2,6‐di‐ tert ‐butyl‐hindered phenol, 1076. Our findings provided important foundation for developing efficient safe polymer products reducing use antioxidants.
Language: Английский
Citations
0
TrAC Trends in Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown, P. 118281 - 118281
Published: May 1, 2025
Language: Английский
Citations
0
Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(42), P. 19004 - 19015
Published: Oct. 10, 2024
Weathering is a significant process that alters the properties of microplastics (MPs) and consequently affects their environmental behaviors. In this study, we introduced novel approach based on polarized light scattering technique, which offers advantages in terms rapid, high-throughput, submicron-sized detection. This technique was successfully applied to characterize weathered MPs after 180-day laboratory simulation coastal environments. By employing polarization measurements, obtained 46-dimensional matrix data set for MP fragments subsequently processed them using backpropagation neural network. The successful extraction effective pulses confirmed presence within size range 0.2-60 μm, yielding total accuracies classification ranging from 78.9 86.9%. Furthermore, achieved an overall accuracy 93.8% classifying with different weathering degrees polymer types, revealing parameters associated morphological changes play dominant role characterizing MPs. Compared conventional approaches, holds great promise accurate characterization small sizes. findings study provided new insights into how change long-term aquatic
Language: Английский
Citations
2
RSC Advances, Journal Year: 2024, Volume and Issue: 14(48), P. 35336 - 35347
Published: Jan. 1, 2024
Proposed mechanism of graphene oxide (GO)/sulfur doped carbon nitride (SCN) nanocomposite demonstrating photocatalytic degradation BPA and LDPE microplastic films under visible light irradiation.
Language: Английский
Citations
1
Polymer Degradation and Stability, Journal Year: 2024, Volume and Issue: unknown, P. 111128 - 111128
Published: Dec. 1, 2024
Language: Английский
Citations
1