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Photochemical Treatment of Blue-Indigo using TiO2-Sunligth System in Heterogeneous Conditions.†
1  Technical University of Esmeraldas. Campus New Horizons. Faculty of Science & Technology, Chemical Engineering Coordination and Multidisciplinary Research Group-GIM-FACI. Esmeraldas, Republic of Ecuador


Abstract: Ecuador is one of the countries in the Latin American region with high textile production. However, chemical treatment strategies in the Ambato, Tungurahua and Quito areas are inefficient and not systematically applied, and the volumes of dyes and pigment-type contaminants generate serious environmental problems. The treatments of indigo textile wastewater and related indigo derivatives are very complex. Taking theses into consideration, was developed a simple photochemical protocol, in heterogeneous conditions, for degrading “blue-indigo” (Ambato textile group) in solution, using TiO2 (Degussa P25, with purity of ≈ 99 % and BET surface area 50 ± 15 m2/g) and solar light at lab scale. The photocatalytic oxidation of organic dye“blue indigo” in aqueous solution was assessed by solar irradiation, in the presence of TiO2 particles. The effect of indigo concentrations, pH and TiO2 loading for maximum degree of degradation were evaluated. The mineralization of “blue indigo” was reported by measuring COD-i and COD-f of the solution that was irradiated with sun light (60-100 minutes) under optimized conditions. Taking into consideration the results was proposed a probable mechanism of degradation .The results allows to re-design, in eco-sustainable conditions, for Ecuador, the strategies for controlling contamination in textile wastewaters.

Keywords: Photocatalysis; textile industrial effluents; titanium dioxide; sunlight.
Comments on this paper
Vincenzo Vaiano
Photocatalytic Removal of Blue-Indigo dye using TiO2-Sunligth System
The paper is very interesting.
My only comment is: why COD and color removal reached a stable value after about 20 min of treatment time?