degradação de corantes ácidos por processos oxidativos avançados usando um reator com disco rotatório de baixa velocidade acid dyes degradation by advanced oxidation processes using a low-speed rotating disk reactor
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degradação de corantes ácidos por processos oxidativos avançados usando um reator com disco rotatório de baixa velocidade acid dyes degradation by advanced oxidation processes using a low-speed rotating disk reactor

;Vilson Bedim Vianna;Alexandre Rodrigues Tôrres;Eduardo Bessa Azevedo
greece and rome 2008 Vol. 31 pp. 1353-1358
184
vianna2008qumicadegradao

Abstract

Three technologies were tested (TiO2/UV, H2O2/UV, and TiO2/H2O2/UV) for the degradation and color removal of a 25 mg L-1 mixture of three acid dyes: Blue 9, Red 18, and Yellow 23. A low speed rotating disc reactor (20 rpm) and a H2O2 concentration of 2.5 mmol L-1 were used. The dyes did not significantly undergo photolysis, although they were all degraded by the studied advanced oxidation processes. With the TiO2/H2O2/UV process, a strong synergism was observed (color removal reached 100%). Pseudo first order kinetic constants were estimated for all processes, as well as the respective apparent photonic efficiencies.

Keywords

dyes tio2

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DOI:
10.1590/S0100-40422008000600015
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