Degradation kinetics for blue acid 9 dye by advanced oxidization process with TiO2/uv

J.A. Cortés, M.T. Alarcón-Herrera, M. Villicaña-Méndez, J. González-Hernández, J.F. Pérez-Robles
Advanced Materials Research Center (CIMAV), MX


Advanced oxidation, colored waste water


The application of advanced oxidation processes TiO2/UV to degrade the blue acid 9 dye was applied. The initial concentrations of the catalyst and the dye have an important impact onto the degradation kinetic. Increases in dye concentrations increase degradation time of the chromophore group. There is a degradation maximizing catalyst concentration, from which there’s no noticeable increase in degradation speed. When both catalyst and dye concentrations are simultaneously increased, degradation time also increases from which we can infer that an increase in dye concentration yields a greater impact than catalyst’s concentration increase. High simultaneous concentration conditions for both catalyst and dye are capable of reducing reaction order by ½ point, the radiation intensity’s diminishment is attributable to the shadow effect generated by the synergic interception effect to the radiation by the dye’s secondary absorption band (410 nm) and the shadow effect of the catalyst’s own particles. Even though two synergic effects are present, the greatest impact is displayed by the increase in dye concentration. The act of overlapping absorption and emission bands shown in the process, allow us to visualize and plan strategies to increase degradation efficiency through better use of the ‘windows’ formed at minimal polluting agent absorption.

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