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

• Main Authors: Vilson Bedim Vianna, Alexandre Rodrigues Tôrres, Eduardo Bessa Azevedo
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2008-01-01
• Series: Química Nova
• Subjects: dyes; POA; TiO2; H2O2
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000600015

<abstract language="eng">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.