The effects of solar irradiation on the two azo dyes CI Acid Red 1 and CI Acid Orange 8 were investigated both on dyed silk and in aqueous solution at pH 2-4.5. When absorbed on silk, the dyes were more photoreactive, both undergoing photodegradation, though at different rates, and displaying a protective action towards the fibre substrate, as evidenced by viscosimetric analysis. In aqueous solution CI Acid Orange 8 underwent photodegradation, with a quantum yield around 10(-3) mol einstein(-1), while the predominant reaction occurring from CI Acid Red 1 was photocyclization, especially at low pH.
|Titolo:||Kinetic study on the sunlight-induced degradation of acid azo dyes on silk|
SELLI, ELENA (Secondo)
|Parole Chiave:||Acid azo dyes; Photodegradation; Silk; Sunlight irradiation|
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||1999|
|Digital Object Identifier (DOI):||10.1016/S0143-7208(98)00045-X|
|Appare nelle tipologie:||01 - Articolo su periodico|