Caffeine-photosensitized degradation has been studied in the presence of bio-based materials derived from urban biowaste after aerobic aging. A peculiar fraction (namely bio-based substances (BBSs)), soluble in all the pH range, has been used as photosensitizing agent. Several caffeine photodegradation tests have been performed, and positive results have been obtained in the presence of BBSs and H2O2, without and with additional Fe(II) (photo-Fenton-like process). Moreover, hybrid magnetite-BBS nanoparticles have been synthesized and characterized, in order to improve the sensitizer recovery and reuse after the caffeine degradation. In the presence of such nanoparticles and H2O2 and Fe(II), the complete caffeine degradation has been attained in very short time. Both homogeneous and heterogeneous processes were run at pH = 5, milder condition compared to the classic photo-Fenton process.
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This work was performed with the financial support for academic interchange by the Marie Sklodowska-Curie Research and Innovation Staff Exchange project funded by the European Commission H2020-MSCA-RISE-2014 within the framework of the research project MAT4TREAT (project number 645551). Compagnia di San Paolo and University of Torino are gratefully acknowledged for funding Project Torino_call2014_L2_126 through “Bando per il finanziamento di progetti di ricerca di Ateneo – anno 2014” (Project acronym: Microbusters). Additionally, authors would like to acknowledge Dr. Flavio R. Sives (La Plata, Argentina) for magnetization measurements.
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Bianco Prevot, A., Baino, F., Fabbri, D. et al. Urban biowaste-derived sensitizing materials for caffeine photodegradation. Environ Sci Pollut Res 24, 12599–12607 (2017). https://doi.org/10.1007/s11356-016-7763-1
- Caffeine photodegradation
- Bio-based substances
- Photo-Fenton, magnetic nanoparticles
- Urban waste