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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Ecological and Health Risk Mediated by Micro(nano)plastics Aging Process: Perspectives and Challenges

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

Published: March 19, 2025

Aged micro(nano)plastics (MNPs) are normally the ultimate state of plastics in environment after aging. The changes physical and chemical characteristics aged MNPs significantly influence their environmental behavior by releasing additives, forming byproducts, adsorbing contaminants. However, a systematic review is lacking on effects ecological human health regarding increasing but scattered studies results. This Review first summarizes unique methods for quantifying aging degree. Then we focused potential impacts organisms, ecosystems, health, including "Trojan horse" under real conditions. Through combining meta-analysis analytic hierarchy process (AHP) model, demonstrated that, compared to virgin MNPs, would result biomass decrease oxidative stress increase organisms lead total N/P greenhouse gas emissions ecosystems while causing cell apoptosis, antioxidant system reaction, inflammation health. Within framework risk assessment, used quotient (RQ) physiologically based pharmacokinetic (PBK) models as examples illustrate importance considering degree data acquisition, model building, formula evaluation. Given risks our urgent call more understand hazards real-world environments.

Language: Английский

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Scalable, Flexible, and UV-Resistant Bacterial Cellulose Composite Film for Daytime Radiative Cooling

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

Radiative cooling, a passive cooling technology, functions by reflecting the majority of solar radiation (within spectrum 0.3-2.5 μm) and emitting thermal atmospheric windows 8-13 μm 16-20 μm). Predominantly, synthetic polymers are effectively utilized for radiative while posing potential environmental hazards due to their complex components, toxicity, or nonbiodegradation. Bacterial cellulose, natural renewable biopolymer, stands out its environmentally friendly, scalability, high purity, significant infrared emissivity. In this work, we developed bacterial cellulose-based composite film (BCF) with cross-linked network structure facile agitation spraying method achieve enhanced sustainable performance. The BCF exhibited superior optical properties tolerance, notable emissivity 94.6%. As result, emitter demonstrates substantial subambient capacity (11:00 13:00, maximum drop 7.15 °C, average 4.85 °C; 22:00 2:00, 2.7 2.32 °C). Additionally, maintained stable after 240 h continuous UV irradiation. Furthermore, can preserve freshness fruits under intense Hence, performance presents broad application prospect in building energy conservation, cells efficiency enhancement, food transportation packaging.

Language: Английский

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Effect of Low‐Temperature Torrefaction Pretreatment on the Energy–Mass Co‐Benefit of Corn Straws

Energy Science & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: April 4, 2025

ABSTRACT To explore the effects of low‐temperature torrefaction on physicochemical properties and energy–mass co‐benefit corn straws, products obtained after at different low temperatures were studied. Through proximate analysis, ultimate scanning electron microscopy, higher calorific value, straws The results showed as follows: After pretreatment, with decrease volatile matter, H/C ratio decreased by 21.59%, O/C 19.05%, value increased 14.78% from 19.42 to 22.29 MJ·kg −1 . Therefore, pretreatment can promote volatilization light components in significantly increase fixed carbon content, then improve mass density energy quality into high‐grade fuels. improvement is convenient for storage transportation, improving combustion.

Language: Английский

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