Abstract
The use of photosensitizers immobilized on mesoporous materials to produce singlet oxygen (1O2) has opened a new way to synthetic and environmental applications due to the fast development of flow photochemistry and continuous-flow microreactors. 1O2-based photosensitized processes can be employed for the degradation of organic pollutants in an aqueous medium and the photosensitizer can be covalently attached to the support and separated from the effluent reducing the environmental impact. The aim of the present paper is to evaluate the 1O2 generation of Rose Bengal (RB) in homogeneous and heterogeneous systems using in-operando evaluation. Mesoporous SiO2 nanoparticles (MSNs) were successfully conjugated with RB (MSN-RB) and electron paramagnetic resonance (EPR) spectroscopy in combination with the spin trap TEMP was employed to obtain paramagnetic TEMPO via generated 1O2 when RB or MSN-RB are exposed to visible light. Additionally, EPR/DMPO was used to exclude the possible generation of other reactive oxygen species (ROS) by the functionalized nanoparticles. We found that in situ 1O2 generation was enhanced when the same amount of RB is immobilized inside of mesoporous SiO2.
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Acknowledgements
C. Mendoza acknowledges the French Community of Belgium for the financial support during his scientific stay at the ENS Lyon, France. The federation RENARD and the Département de Chimie Moleculaire, Université Grenoble Alpes, are also acknowledged for their support.
Funding
The research was funded through the ARC grant for Concerted Research Actions, financed by the French Community of Belgium, ARC-icFlow (Integrated Continous Flow Photoreactors) project
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Mendoza, C., Désert, A., Khrouz, L. et al. Heterogeneous singlet oxygen generation: in-operando visible light EPR spectroscopy. Environ Sci Pollut Res 28, 25124–25129 (2021). https://doi.org/10.1007/s11356-019-04763-5
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DOI: https://doi.org/10.1007/s11356-019-04763-5