Degradation of tetracycline by peroxymonosulfate activated with Mn0.85Fe2.15O4-CNTs: Key role of singlet oxygen

Peng, Xueer; Zhou, Chenyang; Li, Xuelian; Qi, Kai; Gao, Lili

doi:10.1016/j.envres.2023.115750

Cited by 15 publications

(1 citation statement)

References 61 publications

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“…These PPRIs participate in sunlight-driven reactions in surface waters that lead to the phototransformation of pollutants and photoinactivation of pathogens. Among the PPRIs, 1 O 2 is especially important for its ability to target electron-rich organic pollutants and viruses. , One way to quantify the amount of 1 O 2 produced by CDOM is through its quantum yield (Φ Δ ), defined as the moles of 1 O 2 produced per mole of photons absorbed by CDOM. Φ Δ values can be used to compare 1 O 2 production from CDOM of different sources and predict the steady-state 1 O 2 concentrations ([ 1 O 2 ] ss ) in surface waters, informing photochemical models that predict pollutant degradation rates and lifetimes.…”

Section: Introductionmentioning

confidence: 99%

Singlet Oxygen Quantum Yields of Pyrogenic Dissolved Organic Matter from Lab-Prepared and Wildfire Chars

Madhiyan,

Moor

2023

Environ. Sci. Technol.

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Wildfires or prescribed fires release pyrogenic dissolved organic matter (pyDOM) into the environment, which can photochemically produce singlet oxygen ( 1 O 2 ) in sun-lit surface waters. 1 O 2 quantum yields (Φ Δ ) are well-studied for non-pyrogenic DOM, but little is understood about the 1 O 2 generation from pyDOM, especially the Φ Δ values from real wildfire samples and their wavelength dependence. In this study, time-resolved 1 O 2 phosphorescence was used to determine the wavelength-dependent Φ Δ values for pyDOM generated from wildfire char and a series of lab-prepared chars produced by combusting oak and pine wood. Wildfire and most lab-prepared pyDOM generally had similar Φ Δ values (2.1−2.7%) at 365 nm compared to the reference Suwannee River Natural Organic Matter (SRNOM) isolate (2.4%). Interestingly, pyDOM from the highest combustion temperature char was found to possess extremely low Φ Δ values compared to SRNOM and other pyDOM at all excitation wavelengths. In addition, it was revealed that the predicted steady-state concentration of 1 O 2 from pyDOM was similar to that from SRNOM, indicating that the addition of pyDOM from wood chars may not strongly impact surface water photochemistry.

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Section: Introductionmentioning

confidence: 99%