Molecular Weights of Dissolved Organic Matter Significantly Affect Photoaging of Microplastics

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(31), P. 13973 - 13985

Published: July 24, 2024

The fate of ubiquitous microplastics (MPs) is largely influenced by dissolved organic matter (DOM) in aquatic environments, which has garnered significant attention. reactivity DOM reported to be greatly regulated molecular weights (MWs), yet little known about the effects different MW on MP aging. Here, aging behavior polystyrene MPs (PSMPs) presence fulvic acids (FAs) and humic (HAs) was systematically investigated. Under ultraviolet (UV) illumination, O/C PSMPs aged for 96 h surged from 0.008 0.146 lower FA (FA<1kDa) treatment, suggesting PSMP However, exhibited a stronger effect facilitating photoaging than HA, can attributed fact that FA<1kDa contains more quinone phenolic moieties, demonstrating higher redox capacity. Meanwhile, compared other fractions, actively involved increase reactive species yields 50–290%, including •OH, plays key role photoaging, contributed 25% electron-donating capacity (EDC). This study lays theoretical foundation better understanding environmental MPs.

Language: Английский

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Differential photodegradation processes of adsorbed polychlorinated biphenyls on biochar colloids with various pyrolysis temperatures

Water Research, Journal Year: 2024, Volume and Issue: 251, P. 121174 - 121174

Published: Jan. 21, 2024

Language: Английский

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Ultrasound catalytic ozonation to remove 5-hydroxy-1,3-phthalic acid from strongly alkaline and high-salt solutions: Aiding nuclear waste disposal and human health

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 345, P. 127352 - 127352

Published: April 3, 2024

Language: Английский

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Thermal Hydrolysis-Induced Molecular Transformations in Sludge: Implications for Photochemical Reactivity and Dissolved Antibiotics Photodissipation

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: unknown, P. 137985 - 137985

Published: March 1, 2025

Language: Английский

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Photodegradation Mechanism of UV-328 in Natural Organic Matter Contexts Under Simulated Solar Irradiation

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

2-(Benzotriazol-2-yl)-4,6-bis(2-methylbutan-2-yl)phenol (UV-328), a widely utilized UV absorber in plastics and diverse products, has been frequently detected the environment; yet, research on its photochemical degradation is scarce. Dissolved organic matter (DOM) particulate (POM), as important components of natural matter, can produce photosensitization by absorbing photons. This study examined influence DOM from various sources photodegradation UV-328 under simulated daylight conditions. Experiments revealed that excited triplet (3DOM*) primary factor enhancing UV-328. Utilizing excitation-emission matrix spectroscopy combined with parallel analysis (EEMs-PARAFAC) seawater ultrafiltration experiments, it was demonstrated high molecular weight DOM, particularly autochthonous produced seawater, could more rapidly photodegrade Additionally, suspended (SPM) influenced inorganic ions, acids, contributing to positive feedback effect process. The pathways products were first elucidated using ultraperformance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF-MS), supplemented density functional theory (DFT) calculations. provides novel insights into mechanisms combining POM for time.

Language: Английский

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Ultrafast photosensitized degradation of xanthates by using methylene blue as photosensitizer under simulated and natural solar light irradiation: Operational parameters, mechanism and toxicity evolution

Journal of Water Process Engineering, Journal Year: 2024, Volume and Issue: 60, P. 105200 - 105200

Published: April 1, 2024

Language: Английский

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Measurement of Permanganate Index in Environmental Water via Indirect Phase-Conversion Strategy

Journal of Chromatography A, Journal Year: 2024, Volume and Issue: 1728, P. 464987 - 464987

Published: May 10, 2024

Language: Английский

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Elucidating the photodegradation mechanism of octylisothiazolinone and dichlorooctylisothiazolinone in surface water: An in-depth comprehensive analysis

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 946, P. 174185 - 174185

Published: June 21, 2024

Language: Английский

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YOLO-PBESW: A Lightweight Deep Learning Model for the Efficient Identification of Indomethacin Crystal Morphologies in Microfluidic Droplets

Micromachines, Journal Year: 2024, Volume and Issue: 15(9), P. 1136 - 1136

Published: Sept. 6, 2024

Crystallization is important to the pharmaceutical, chemical, and materials fields, where morphology of crystals one key factors affecting quality crystallization. High-throughput screening based on microfluidic droplets a potent technique accelerate discovery development new crystal morphologies with active pharmaceutical ingredients. However, massive morphologies’ datum needs be identified completely accurately, which time-consuming labor-intensive. Therefore, effective detection small-target tracking are essential for high-efficiency experiments. In this paper, improved algorithm YOLOv8 (YOLO-PBESW) detecting indomethacin different proposed. We enhanced its capability in small targets through integration high-resolution feature layer P2, adoption BiFPN structure. Additionally, adding EMA mechanism before P2 head was implemented improve network attention towards global features. Furthermore, we utilized SimSPPF replace SPPF mitigate computational costs reduce inference time. Lastly, CIoU loss function substituted WIoUv3 performance. The experimental findings indicate that model attained advancements, achieving AP metrics 93.3%, 77.6%, 80.2%, 99.5% wire, rod, sheet, jelly-like phases, respectively. also achieved precision 85.2%, recall 83.8%, an F1 score 84.5%, mAP 87.6%. terms efficiency, model’s dimensions operational efficiency reported as 5.46 MB, it took 12.89 ms process each image speed 77.52 FPS. Compared state-of-the-art lightweight object models such FFCA-YOLO series, our proposed YOLO-PBESW improvements morphologies, particularly sheets rods. demonstrated values exceeded L-FFCA-YOLO by 7.4% 3.9% rods, while delivering superior F1-score. maintained lower complexity, parameters only 11.8 GFLOPs 2.65 M, higher These outcomes collectively demonstrate method balance between speed.

Language: Английский

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Concentration and compositional controls on degradation of permafrost‐derived dissolved organic matter on the Qinghai–Tibetan Plateau

Limnology and Oceanography Letters, Journal Year: 2024, Volume and Issue: 9(5), P. 563 - 572

Published: April 9, 2024

Abstract Understanding the fate of permafrost‐derived dissolved organic matter (DOM) is critical for unraveling its role in carbon cycling. However, it remains unclear whether high lability DOM can be attributed to intrinsic chemical properties or elevated concentrations. We investigated dynamics permafrost from Qinghai–Tibetan Plateau using both biodegradation and photodegradation experiments. Biodegradation exhibited distinct qualitative preferences specific groups (i.e., peptide‐like aromatics, respectively). Notably, reducing initial concentration (DOC) by half a quarter resulted shifts biodegradable DOC content 11.2% 11.5% 8.5%, respectively, accompanied corresponding decrease rate 0.11 0.06 0.03. This insight highlights importance recognizing interplay between quality bears broader significance our understanding natural ecosystems.

Language: Английский

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