Reference : Heterogeneous singlet oxygen generation: in-operando visible light EPR spectroscopy
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/233473
Heterogeneous singlet oxygen generation: in-operando visible light EPR spectroscopy
English
Mendoza Gallego, Carlos mailto [Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces >]
Désert, Anthony [Ecole Normale Supérieure de Lyon > > > >]
Khrouz, Lhoussain [Ecole Normale Supérieure de Lyon > > > >]
Pàez Martinez, Carlos mailto [Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces >]
Parola, Stéphane [Ecole Normale Supérieure de Lyon > > > >]
Heinrichs, Benoît mailto [Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces >]
1-Mar-2019
Environmental Science and Pollution Research
Springer
Yes (verified by ORBi)
International
0944-1344
1614-7499
Germany
[en] Singlet oxygen ; EPR ; TEMP ; Immobilization ; Rose Bengal ; Photosensitizer heterogenization
[en] 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 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.
http://hdl.handle.net/2268/233473
10.1007/s11356-019-04763-5

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