A mild photochemical approach to the degradation of phenols from olive oil mill wastewater.
Photooxidation of cathecol (1) is carried out in aqueous solution at lambda > 300 nm using different sensitizers: rose bengal (RB), 9,10-dicyanoanthracene (DCA), 2,4,6-triphenylpyrylium tetrafluoroborate (Pyryl). The highest degradation is observed in the UV/RB-sensitized reaction (66% after 15 h of irradiation), mineralization and formation of dimers are the final events. This procedure has been extended to tyrosol (2), caffeic acid (3), vanillic acid (4), 4-hydroxycinnamic acid (5) and 4-hydroxybenzoic acid (6) as well as to a mixture of all phenols. A reduced toxicity of the UV/RB-irradiated solutions of cathecol and tyrosol towards alga Ankistrodesmus braunii is also verified.
Cermola
Flavio
F
Dipartimento di Chimica Organica e Biochimica, Università degli Studi di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, via Cinthia, I-80126 Napoli, Italy.
DellaGreca
Marina
M
Iesce
M Rosaria
MR
Montella
Stefania
S
Pollio
Antonino
A
Temussi
Fabio
F
D000704:Analysis of Variance; D000873:Anthracenes; D000460:Chlorophyta / Q000187:drug effects* / Q000378:metabolism; D000069463:Olive Oil; D010636:Phenols / Q000737:chemistry*; D010782:Photolysis; D010938:Plant Oils / Q000737:chemistry*; D012395:Rose Bengal; D013997:Time Factors; D036401:Toxicity Tests, Chronic; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
D000873:Anthracenes; D000069463:Olive Oil; D010636:Phenols; D010938:Plant Oils; D014874:Water Pollutants, Chemical; D014867:Water; D012395:Rose Bengal