Reactor photochemical characterization for application in advanced oxidative process

  • Ailton Jose Moreira Programa de Pós-Graduação em Química, Universidade Federal de São Carlos, São Paulo, São Carlos, CEP 13565-905, Brasil. http://orcid.org/0000-0003-0741-8840
  • Thales Martins Silva Programa de Pós-Graduação em Engenharia Química, Universidade Federal de Alfenas, Minas Gerais, Poços de Caldas, Brasil http://orcid.org/0000-0001-6500-7447
  • Gian Paulo Giovanni Freschi Programa de Pós-Graduação em Engenharia Química, Universidade Federal de Alfenas, Minas Gerais, Poços de Caldas, CEP 37715-400, Brasil http://orcid.org/0000-0001-8153-3543

Abstract

O presente estudo visa ampliar a compreensão dos processos fotoquímicos por meio do cálculo de eficiência quântica da lâmpada Hg-MDEL, além de discutir sobre a aplicação ambiental desse modelo de lâmpada em processos oxidativos avançados. Esse conjunto de informações são de imensa relevância para ampliar a aplicação das Hg-MDEL em estudos ambientais diversos. Deste modo, um reator fotoquímico composto por uma lâmpada de mercúrio sem eletrodos de descarga (Hg-MDEL) acionada por micro-ondas (MW) foi avaliado a partir de estudos actinométricos KI/KIO3. Os espectros de emissão foram caracterizados junto as regiões UV-A, UV-B, UV-C e visível por meio de um espectrorradiômetro, apresentando correlação linear com a variação de potência micro-ondas aplicada. A conversão fotoquímica de KI/KIO3 em I3- foi de até 0,073 mmol L-1 quando a concentração inicial de KI era de 0,1 mol L-1 e 0,65 mmol L-1 quando a concentração de KI era de 0,7 mol L-1, aplicando uma potência micro-ondas de 600 e 400 W, respectivamente. Estes resultados indicam que para potências mais elevadas, a emissão de fótons junto ao reator é mais significativa, contribuindo de modo ativo para a formação de I3-.

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Published
2019-09-30
How to Cite
MOREIRA, Ailton Jose; SILVA, Thales Martins; FRESCHI, Gian Paulo Giovanni. Reactor photochemical characterization for application in advanced oxidative process. Acta Brasiliensis, [S.l.], v. 3, n. 3, p. 124-130, sep. 2019. ISSN 2526-4338. Available at: <http://revistas.ufcg.edu.br/actabra/index.php/actabra/article/view/240>. Date accessed: 14 dec. 2024. doi: https://doi.org/10.22571/2526-4338240.
Section
Environmental Chemistry