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Degradação de corantes ácidos por processos oxidativos avançados usando um reator com disco rotatório de baixa velocidade

2008; Brazilian Chemical Society; Volume: 31; Issue: 6 Linguagem: Inglês

10.1590/s0100-40422008000600015

ISSN

1678-7064

Autores

Vilson Bedim Vianna, Alexandre Rodrigues Tôrres, Eduardo Bessa Azevedo,

Tópico(s)

Water Quality Monitoring and Analysis

Resumo

PROCESSES USING A LOW-SPEED ROTATING DISK REACTOR.Three technologies were tested (TiO 2 /UV, H 2 O 2 /UV, and TiO 2 /H 2 O 2 /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 H 2 O 2 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 TiO 2 /H 2 O 2 /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.

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