Photochemical behavior of dissolved organic matter in environmental surface waters: A review

Eco-Environment & Health, Год журнала: 2024, Номер 3(4), С. 529 - 542

Опубликована: Июль 3, 2024

As an important group of widespread organic substances in aquatic ecosystems, dissolved matter (DOM) plays essential role carbon recycling and transformation processes. The photochemical behavior DOM is one the main ways it participates these processes, attracts extensive attention. However, due to a variety sources water conditions, including both freshwater seawater environments, properties exhibit great differences. Nowadays, large number studies have focused on generation process reactive species (RS) from sunlit DOM, while little effort has been made so far provide comprehensive summary especially fresh saline ecosystems. In this review, we analyzed research hotspot photochemistry over last 30 years, summarizing photoreactive natural environments containing (both seawater) listing factors affecting rate, yield, RS photoproduction. Compared with freshwater, unique characteristics such as high pH value, ionic strength, halide ions, which affect photogeneration RS, photoconversion process, well reaction pathways various environmental substances. general, DOM-induced surface impacts toxic effects pollutants can even contribute significantly Earth's cycle, would potential implications for human ecological health.

Язык: Английский

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Mechanistic Insight into Multiple Effects of Copper Ion on the Photoreactivity of Dissolved Organic Matter

Journal of Hazardous Materials, Год журнала: 2025, Номер 487, С. 137124 - 137124

Опубликована: Янв. 5, 2025

Язык: Английский

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Iron(II/III) Alters the Relative Roles of the Microbial Byproduct and Humic Acid during Chromium(VI) Reduction and Fixation by Soil-Dissolved Organic Matter

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 30, 2025

Though reduction of hexavalent chromium (Cr(VI)) to Cr(III) by dissolved organic matter (DOM) is critical for the remediation polluted soils, effects DOM chemodiversity and underlying mechanisms are not fully elucidated yet. Here, Cr(VI) immobilization mediated microbial byproduct (MBP)- humic acid (HA)-like components in (hot) water-soluble (WSOM), (H)WSOM, from four soil samples tropical subtropical regions China were investigated. It demonstrates that capacity decreases order WSOM > HWSOM MBP-enriched HA-enriched due higher contents low molecular weight saturated compounds CHO molecules former. The presence Fe(II/III) selectively coprecipitates with high (e.g., tannins, lignin, CHON-rich compounds) form ferrihydrite greatly inhibits transformation fixation but enhances DOM. This probably owing combined (1) increase electron-donating Fe(II) generation during reactions HA Fe(III), respectively; (2) enrichment phenolic carboxyl groups, aromatic compounds, carbon defects on surfaces; (3) acceleration decomposition MBP mineralization hydroxyl radicals. These findings enhance our understanding DOM, complex interactions between Cr(VI), Fe(II/III), can help design strategies contaminated environments.

Язык: Английский

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Use of Copper in Evaluating the Role of Phenolic Moieties in the Photooxidation of Dissolved Organic Matter

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Фев. 10, 2025

In a recent study, copper was shown to act as novel quencher for investigating the mechanism of photooxidation and photobleaching dissolved organic matter (DOM) by selectively quenching one-electron oxidizing intermediates DOM (DOMD•+). However, capture DOMD•+ Cu is possibly partially due strong competition from phenolic antioxidant moieties intrinsically present in quenching. this extent interaction between quantified measuring inhibitory effect on under varying pH (5.2-10.0) conditions. The increase facilitates formation deprotonated (pKa ∼ 9-10), increasing their capacity DOMD•+. Accordingly, our results indicate that loss electron-donating significantly decreased with an pH, suggesting more pronounced within DOM. Considering precursors also originate DOM, findings study provide important insights into long-distance charge transfer reactions occurring at different moiety sites during photooxidation.

Язык: Английский

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Fates of Terrigenous Dissolved Organic Carbon in the Gulf of Maine

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Фев. 7, 2024

A significant amount of organic carbon is transported in dissolved form from soils to coastal oceans via inland water systems, bridging land and ocean reservoirs. However, it has been discovered that the presence terrigenous (tDOC) relatively limited. Therefore, understanding fates tDOC essential account for sequestration through ecosystems ensure accurate regional budgeting. In this study, we developed a state-of-the-art modeling approach by coupling land-to-ocean flux simulation model tracking determine potential exported three primary drainage basins Gulf Maine (GoM). According our findings, over half year GoM, 56.4% was mineralized. Biomineralization responsible 90% amount, with remainder attributed photomineralization. Additionally, 37% remained suspended 6.6% buried marine sediment.

Язык: Английский

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Excellent antibiotic degradation through PMS activation via bio derived Fe-Mn oxides with tunable defect concentration: Synergy between singlet oxygen oxidation and electron transfer

Journal of environmental chemical engineering, Год журнала: 2024, Номер 12(6), С. 114338 - 114338

Опубликована: Окт. 2, 2024

Язык: Английский

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Spectroscopic investigation of the binding behavior of Cd2+, Cu2+, Cr3+ and Fe3+ with humic acid of varying molecular weights

Journal of Water Process Engineering, Год журнала: 2025, Номер 71, С. 107434 - 107434

Опубликована: Март 1, 2025

Язык: Английский

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Enhanced iodinated disinfection byproducts formation in iodide/iodate-containing water undergoing UV-chloramine sequential disinfection: machine learning-aided identification of reaction mechanisms

Water Research, Год журнала: 2024, Номер 272, С. 122975 - 122975

Опубликована: Дек. 14, 2024

Язык: Английский

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