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Photodegradation of Azo Dyes in Textile Wastewater

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Neamtu M., Siminiceanu I., Macoveanu M., Yediler A., Kettrup A.

Editorial: Dyes and Pigments, 53, p.93-99, 2002.


The photodegradation of three non hydrolysed reactive azo dyes (Reactive red 120, Reactive black 5, Reactive yellow 84) in aqueous solution was investigated in a laboratory-scale batch photoreactor equipped with an immersed lowpressure mercury lamp. Six different doses of hydrogen peroxide, at constant initial concentration of the substrate (100 mg/l) were used. The pseudo-first order rate constants have been calculated from the experimental kinetic curves, for the three azo dyes. These rate constants have extreme values of the order of 0.1 1/min at a H2O2 dose of 24.5 mmol/l.
The effectiveness of the UV/H2O2 process has been evaluated by the degree mineralization of the total organic carbon (TOC), as a complementary indicator of the treatment efficiencies. Our results confirm the suitability of the UV/H2O2
process as a textile wastewater pre-treatment step, once optimum operating conditions and cost effectiveness of the
method are established.

Cuvinte cheie: photodegradation, azo dyes, rate constants