Resumo

ARROYAVE ROJAS, Joan Amir; GARCES GIRALDO, Luis Fernando  e  ARANGO RUIZ, Álvaro. Mineralization of the Tartrazine dye by an advanced oxidation process. Rev. Lasallista Investig. [online]. 2009, vol.6, n.2, pp.46-53. ISSN 1794-4449.

Introduction. The importance of treating waste waters is based on removing the contaminants and the mineralization of the components into compounds harmless for the environment, aiming to reduce the impact and the environmental misbalance generated by the presence of undesired substances in the aqueous ecosystems. Objective. To evaluate the mineralization of the Tartrazine dye by the use of heterogeneous photo catalysis with titanium dioxide and an ultra violet light lamp. Materials and methods. An experimental randomized factorial design was used. In the experiments, an ultra violet light lamp, a glass reservoir to store the aqueous solution sample and a pump to re-circulate the solution, were used. The mineralization was determined by the ultra violet /visible espectrophotometry, using sulfates for the parameter, and the removal of sulfates was calculated at different concentration times. Results. Mineralization percentages of the Tartrazine dye above 92.8% were achieved. Nevertheless, when technical and economic factors were analyzed, it was considered that the most adequate experimental combination to achieve the dye's mineralization corresponds to a combination of 0mg/L of TiO₂ and 0,2 % v/ v of the hydrogen peroxide oxidation agent, which represents a chemical oxidation process. Conclusion. Advanced oxidation processes, such as chemical oxidation with hydrogen peroxide, are beneficial for the mineralization of the Tartrazine dye.

Palavras-chave : Photo degradation; Mineralization; Tartrazine; Azo dyes; Titanium dioxide; Hydrogen peroxide; Food industries.

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