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.
Kinetic study on the sunlight-induced degradation of acid azo dyes on silk / M. Massafra, E. Selli, S. Salsa, B. Marcandalli. - In: DYES AND PIGMENTS. - ISSN 0143-7208. - 40:2-3(1999), pp. 171-180.
Kinetic study on the sunlight-induced degradation of acid azo dyes on silk
E. SelliSecondo
;
1999
Abstract
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.
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