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Steering Energy Transfer Pathways through Mn-Doping in Perovskite Nanocrystals.
J Am Chem Soc
January 2025
Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States.
Modulation of singlet and triplet energy transfer from excited semiconductor nanocrystals to attached dye molecules remains an important criterion for the design of light-harvesting assemblies. Whereas one can consider the selection of donor and acceptor with favorable energetics, spectral overlap, and kinetics of energy transfer as a means to direct the singlet and triplet energy transfer pathways, it is not obvious how to control the singlet and triplet characteristics of the donor semiconductor nanocrystal itself. By doping CsPb(ClBr) nanocrystals with Mn, we have now succeeded in increasing the triplet characteristics of semiconductor nanocrystals.
View Article and Find Full Text PDFOxidative degradation of sulfamethazine by manganese oxide supported biochar activated periodate: Effect and mechanism.
Ecotoxicol Environ Saf
January 2025
State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Nanjing, Jiangsu, 210042, China. Electronic address:
In this study, manganese oxide supported biochar (MBC) was used as a catalyst of periodate (PI) for the oxidative degradation of sulfonamide antibiotic sulfamethazine (SMZ). The degradation rate of 10 mg/L SMZ reached 99 % in 60 min in the MBC/PI system, and the optimal condition was pH 3.5, 0.
View Article and Find Full Text PDFDynamics of hydrogen shift reactions between peroxy radicals.
Phys Chem Chem Phys
January 2025
The Fritz Haber Center for Molecular Dynamics, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Peroxy radicals are key intermediates in many atmospheric processes. Reactions between such radicals are of particular interest as they can lead to accretion products capable of participating in new particle formation (NPF). These reactions proceed through a tetroxide intermediate, which then decomposes to a complex of two alkoxy radicals and O, with spin conservation dictating that the complex must be formed in the triplet state.
View Article and Find Full Text PDFA Complete Description of the Ultrafast Proton Transfer Dynamics in the Excited State of D-Luciferin.
J Phys Chem B
January 2025
UM-DAE Centre for Excellence in Basic Sciences, Kalina Campus of Mumbai University, Santacruz (E), Mumbai 400098, India.
Excited-state proton transfer (ESPT) in organic photoacids is a widely studied phenomenon in which D-luciferin is of special mention, considering the fact that apart from its phenolic OH group, the nitrogen atoms at either of the two thiazole moieties could also participate in hydrogen bonding interactions with a proton-donating solvent during ESPT. As a result, several transient species could appear during the ESPT process. We hereby deploy subpicosecond time-resolved fluorescence upconversion (FLUP) and transient absorption (TA) spectroscopic techniques to understand the detailed photophysics of D-luciferin in water as well as in dimethyl sulfoxide (DMSO) and ethanol.
View Article and Find Full Text PDFCatalytic degradation of diclofenac by ZnO-CoO: identification of major intermediates and degradation pathway.
Environ Sci Pollut Res Int
January 2025
Centre de Recherche Scientifique Et Technique en Analyses Physico-Chimiques, CP 42004, Bou-Ismail, Tipaza, Algeria.
Article Synopsis
- The ZnO-CoO catalyst, synthesized through the co-precipitation method, demonstrated high efficiency for removing diclofenac sodium (DCF) by activating peroxymonosulfate (PMS), achieving nearly 99% removal under optimal conditions.
- Quenching experiments highlighted that the reactive oxygen species, singlet oxygen, and superoxide radicals were crucial for DCF degradation in the ZnO-CoO/PMS system, with catalyst stability being confirmed through negligible cobalt leaching and consistent degradation rates over multiple cycles.
- Eight degradation products of DCF were identified and assessed for toxicity, indicating that the ZnO-CoO/PMS system is a viable option for degrading organic pollutants effectively.
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