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Kinetics of the biacetyl‐sensitised photo‐oxidation of CI Acid Orange 7
Author(s) -
Neevel J G,
Peereboom M,
Graaf B
Publication year - 1993
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1993.tb01540.x
Subject(s) - singlet oxygen , photochemistry , chemistry , flash photolysis , quenching (fluorescence) , quantum yield , oxygen , photodegradation , orange (colour) , kinetics , reaction rate constant , fluorescence , catalysis , organic chemistry , photocatalysis , physics , food science , quantum mechanics
A kinetic model for the biacetyl‐sensitised photo‐oxidation of Cl Acid Orange 7 in aqueous solution during continuous irradiation at 365 nm is presented. Biacetyl was taken as a model for naturally occurring carbonyl species in polymers such as oxidised celluloseand lignin involved in photosensitised degradation of azo dyes. Quenching of triplet biacetyl by the dye and by oxidation products as well as quenching of singlet oxygen by waterand by oxidation products was accounted for. The equations derived from the model describe the relationship between the measured quantum yield of dye fading and dye concentration, as well as that between measured quantum yield of oxygen demand and dye concentration. Reaction rate parameters were calculated by a nonlinear least squares method, and were in accordance with literature values and values measured by flash photolysis. The relative amount of dye faded by singlet oxygen was estimated as 1.4–14%, indicating that singlet oxygen was of minor importance as an oxidative species.