Producción + Limpia
versão impressa ISSN 1909-0455
GARCES GIRALDO, Luis Fernando. Photo degradation of dyed waste water analyzed by the response surfaces. Rev. P+L [online]. 2011, vol.6, n.1, pp. 50-65. ISSN 1909-0455.
Introduction. Textile dyes are very persistent in the environment and the classic methods to eliminate them are not useful because partial oxidations or reductions can create very toxic secondary products. Many of the dyes are not directly toxic for living organisms, but the strong coloring they bring to the aquatic environment can suppress photosynthesis in watercourses so their presence must be controlled. Objective. To select the optimal dose of photo sensitizer and oxidation agent to degrade novactive blue FHBRNS. Materials and methods. A synthetic sample with 300mg/L of novactive blue FHBRNS dye used in textiles was used. This is the most common concentration in effluents from the textile industries that use this dye. In the experiments, TiO2 and FeCl3 were used in 30 and 60 mg/L concentrations and as an oxidation agent H2O2 was used in concentrations between 0.5, 1.0 and 1.5 mg/L. Results.The dye is fastly degraded and mineralized with FeCL3. This happened in the test in which 60mg/L FeCL3 and 10 mL/L of H2O2 were used. Conclusion. Degradation percentages of 97.3% and 65.8%, respectively, were obtained.
Palavras-chave : photo degradation; Novactive blue FHBRNS; oxidation agent; photolysis; photocatalysis.