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Visible-light promoted photoprocesses on aqueous gallic acid in the presence of riboflavin. Kinetics and mechanism by Adriana Pajares; Mabel Bregliani; M. Paulina Montaña; Susana Criado; Walter Massad; José Gianotti; Isela Gutiérrez; Norman A. García is a Materials Science article available to read on EtoBox.
What is Visible-light promoted photoprocesses on aqueous gallic acid in the presence of riboflavin. Kinetics and mechanism about?
Within the frame of possible precursory photoreactions in the generation of humic substances, the visiblelight promoted interaction between riboflavin (Rf), a native photosensitizer in aqueous systems, and gallic acid (GA), a polyphenol naturally formed after lignin degradation, was investigated. A systematic kinetic and mechanistic study was conducted under aerobic conditions in aqueous media, through visiblelight continuous photolysis, polarographic detection of oxygen uptake, stationary and time resolved fluorescence spectroscopy, time resolved near-IR phosphorescence detection and laser flash photolysis techniques. GA is degraded relatively fast in pH 7 aqueous solutions, where singlet molecular oxygen (O 2 ( 1 g )), superoxide radical anion (O 2 •-) and hydrogen peroxide (H 2 O 2 ) -all three species photogenerated from triplet excited Rf -participate in the photoprocess. The general conclusion is that in natural waters GA can undergo spontaneous phototodegradation under environmental conditions. Radical species generated in the presence of Rf can participate in condensation or polymerization reactions promoting the natural synthesis of humic products.
Who reads Visible-light promoted photoprocesses on aqueous gallic acid in the presence of riboflavin. Kinetics and mechanism?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Adriana Pajares; Mabel Bregliani; M. Paulina Montaña; Susana Criado; Walter Massad; José Gianotti; Isela Gutiérrez; Norman A. García
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 1010-6030)
- Published
- 2010
- Language
- EN
- Field
- Materials Science (Physical Sciences)