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Previous issue date: 2017-04-12 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Agrot?xicos s?o cotidianamente dispostos no meio ambiente atrav?s do uso indiscriminado em lavouras, elimina??o de esgoto bruto e efluentes de esta??es de tratamento, causando danos ? biota aqu?tica e terrestre. Formas de degrada??o que possibilitam a elimina??o completa destes poluentes, que agem oxidando-os a subst?ncias at?xicas, foram tema de investiga??o do presente trabalho. Os processos de oxida??o avan?ada (POAs) s?o apontados como uma inovadora tecnologia com potencial de obter excelentes resultados na oxida??o de subst?ncias org?nicas complexas, pois possibilitam a completa degrada??o de subst?ncias org?nicas oxidando-as a g?s carb?nico, ?gua e ?ons inorg?nicos ou possibilitam a transforma??o de subst?ncias complexas em outras mais biodegrad?veis. No presente trabalho estudamos a viabilidade dos POAs foto-Fenton e sistema UV/H2O2, assim como a fotodegrada??o por radia??o ultravioleta em tr?s pesticidas, sendo eles o 2,4-D (?cido 2,4-diclorofen?xiac?tico), o MSMA (Metilarsenato monoss?dico), e o Glifosato (N-fosfometil glicina). Foi observada a influ?ncia da varia??o de per?xido de hidrog?nio nas taxas de degrada??o dos processos estudados, assim como a efici?ncia da fotodegrada??o por luz UV. Em s?ntese, os melhores resultados se deram para o 2,4-D na concentra??o de 20 mg/L de per?xido de hidrog?nio atingindo aproximadamente 100% de degrada??o nos primeiros 60 minutos de ensaio e glifosato nos tr?s ensaios realizados, sendo o de propor??o [C] [OH-] [1]:[1] o mais efetivo em termos de taxa de degrada??o. Os experimentos apresentaram resultados de degrada??o importantes conferindo efetividade aos processos de oxida??o avan?ada estudados. / Agrochemicals are everyday in the environment by eliminating raw sewage, effluent from treatment plants and indiscriminate use in crops, causing damage to the aquatic and terrestrial biota. Forms of degradation that allow a complete elimination of these pollutants, which act by oxidizing them to substances in the subject, were the subject of research of the present work. Advanced oxidation methods (POAs) emerge as a new technology with the potential to obtain excellent results in the oxidation of complex organic substances, as they allow the complete degradation of organic substances by oxidizing them like carbon dioxide, water and inorganic ions or enabling a transformation of substances Complex in other more biodegradable. There is no work to study the feasibility of photo-Fenton POAs and UV / H2O2 system, as well as ultraviolet photodegradation in three pesticides, 2,4-D (2,4-dichlorophenoxyacetic acid), MSMA (Monosodium methylarsenate ), and Glyphosate (N-phosphonomethyl glycine). It was observed an influence of the hydrogen peroxide variation in the degradation rates of the studied processes, as well as an update of the photodegradation by UV light. Second, the best results were for 2,4-D at the concentration of 20 mg / L of hydrogen peroxide in approximately 100% degradation in the first 60 minutes of the test and glyphosate in the three tests carried out, [C] [OH-] [1]: [1] the most effective in terms of rate of degradation. The experiments showed important degradation results, giving effectiveness to the oxidation processes.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23554 |
| Date | 12 April 2017 |
| Creators | Batista, Mariana da Costa |
| Contributors | 02856940498, http://lattes.cnpq.br/1964398358506333, Santos, Helio Rodrigues dos, 75200252415, http://lattes.cnpq.br/9048384392428073, Rosenhaim, Raul, 95207317415, http://lattes.cnpq.br/9261819452666830, Sena, Rennio Felix de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA SANIT?RIA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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