Irradiation and DOM mediate Lead Release from Polyvinyl Chloride Microplastics in Natural Surface Water

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 486, P. 137080 - 137080

Published: Jan. 1, 2025

Language: Английский

Efficient Production of Reactive Oxidants by Atmospheric Bacterial-Derived Organic Matter in the Aqueous Phase

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

Published: March 27, 2025

Hydroxyl radicals (•OH), singlet oxygen (1O2*), and organic triplet excited states (3C*) play key roles as oxidants ("reactive intermediates (RIs)") in forming oxidizing aqueous aerosols. Bioaerosols are ubiquitous the atmosphere, but little is known about their photochemical behavior contributions to atmospheric photochemistry. We investigated of aqueous-phase cellular matter (COM) extracellular polymeric substances (EPS) from cultured bacteria isolated PM2.5, focusing on production 3C*, 1O2*, •OH. The molecular size aromaticity chromophores fluorophores COM EPS increased with weight (MW). Apparent quantum yields (ΦRI) up 10% 5% were measured for 1O2* respectively, which upper range previously reported values. This indicated that contain photosensitizers highly efficient at producing 3C*. ΦRI concentrations ([RI]ss) decreased MW due higher-MW molecules engaging charge-transfer interactions disrupt processes oxidant production. Machine learning models used understand predict based measurable optical chemical properties EPS. study provides new insights into bioaerosols can

Language: Английский

Roles of Direct and Indirect Photodegradation in the Photochemical Fates of Three 3rd Generation Fluoroquinolones

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 136314 - 136314

Published: Oct. 30, 2024

Language: Английский