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Previous issue date: 2016-07-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A ind?stria t?xtil gera um grande volume de efluentes que, muitas vezes, s?o descartados no meio ambiente sem estarem devidamente tratados. Esses efluentes s?o formados de mol?culas org?nicas e caracterizam-se por apresentar cor, que alteram as propriedades da ?gua deixando-a impr?pria para o consumo. Para o tratamento desses efluentes, a utiliza??o de processos catal?ticos heterog?neos de custo baixo pode ser vantajoso. As argilas v?m sendo bastante estudadas como suportes catal?ticos em raz?o de sua abund?ncia na crosta terrestre e seu baixo custo. Portanto, neste trabalho as argilas vermiculita e bentonita foram usadas como suporte para o catalisador oxihidr?xido de ni?bio e pelo m?todo de deposi??o-precipita??o foram obtidos comp?sitos formados por esses materiais. Os comp?sitos Nb/argila foram caracterizados e as principais t?cnicas mostraram que ocorreu uma modifica??o em cada argila. Os resultados de difratrometria de raios X (DRX) indicaram que ocorreu uma diminui??o da intensidade da reflex?o e um deslocamento do pico principal de ambas as argilas quando o oxihidr?xido de ni?bio ? adicionado na estrutura. As an?lises de espectroscopia na regi?o do infravermelho mostram bandas de adsor??o de ambos os materiais nos comp?sitos Nb/argila, dando a indicativa de que o comp?sito foi realmente formado. As imagens de microscopia eletr?nica de varredura tamb?m confirmaram essa modifica??o de estrutura. Foram realizados testes de oxida??o e oxida??o fotocatal?tica com os comp?sitos obtidos e o teste de oxida??o fotocatal?tica foi o que apresentou melhores resultados, pois o comp?sito de vermiculita (Nb/V0) apresentou uma maior atividade fotocatal?tica removendo 98% da cor do corante alaranjado de metila em 90 minutos de rea??o enquanto que o material comp?sito de bentonita (Nb/B0) removeu apenas 63% durante o mesmo tempo de rea??o. Essa atividade ? devido o comp?sito Nb/V0 ter apresentado um menor valor de band gap (3,08eV) que o comp?sito Nb/B0 (3,33eV). / The textile industry produces a large volume of waste that often is discarded into the environment without being properly treated. These effluents are made of organic molecules and are characterized by their color that alter the properties of water which leave it unfit for consumption. For the treatment of these effluents, the use of heterogeneous catalytic processes of low cost can be advantageous. Clays have been widely studied as catalyst supports because of their abundance in the Earth's crust and its low cost. Therefore, in this study the clays vermiculite and bentonite were used as support for the catalyst oxyhydroxide niobium and by the method of deposition-precipitation it was obtained composites formed from these materials. The composite Nb/clay were characterized and the main techniques showed that was changes in each clay. The results X-ray diffractometer (XRD) showed that there was a decrease in reflection intensity and a shift of the main peak of both clays when oxyhydroxide niobium is added to the structure. The spectroscopic analyzes show infrared adsorption bands of in both materials composite Nb/clay which indicates that the composite was actually formed. The scanning electron microscopy images also confirmed that structure modification. Oxidation and photocatalytic oxidation tests were performed with the obtained composite and photocatalytic oxidation test showed the best results, because the vermiculite composite (Nb/V0) showed higher photocatalytic activity by removing 98% of the color orange dye methyl in 90 minutes of reaction while the composite material of bentonite (Nb/B0) removed only 63% over the same reaction time. This activity is due to the composite Nb/V0 have presented a smaller value of band gap (3,08eV) than the composite Nb/B0 (3,33eV).
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21866 |
| Date | 25 July 2016 |
| Creators | Ara?jo, Marcella Jordanna Silva Montoril |
| Contributors | 03330987499, http://lattes.cnpq.br/5738717177200782, Gondim, Amanda Duarte, 03014598437, http://lattes.cnpq.br/6738828245487480, Fernandes, Glauber Jos? Turolla, 72074442491, http://lattes.cnpq.br/6067867622712912, Guedes, Ana Paula de Melo Alves |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM QU?MICA, 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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