Analytical Methods in Photoelectrochemical Treatment of Phenol

نویسندگان

  • Paulo R. M. Lopes
  • Renato N. Montagnolli
  • Ederio D. Bidoia
چکیده

O presente estudo visou o tratamento de efluente simulado, contendo fenol por processos fotocatalítico e fotolítico com análise toxicológica das soluções fenólicas. Dois sistemas de tratamento foram propostos com radiação UV, eletrodos maciços e potencial elétrico. No primeiro sistema (S1), a concentração de fenol foi determinada por espectrofotometria direta em 269 nm e o segundo (S2) por meio do método fotométrico direto (4-aminoantipirina). Testes de toxicidade foram realizados com dois microrganismos: Escherichia coli e Saccharomyces cerevisiae. Os resultados de S1 demonstraram que conclusões errôneas podem ser retiradas em relação ao aumento de absorbância no pico do fenol de acordo com o tempo de tratamento. Contudo, o método fotométrico direto foi capaz de identificar a redução do fenol em S2 e observou-se que os tratamentos propostos degradaram as moléculas de fenol em solução. Também, no tratamento com fonte ultravioleta de alta energia (UVC), a degradação fenólica deve-se principalmente à fotólise.

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تاریخ انتشار 2011