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Previous issue date: 2012-01-30 / Volatile Organic Compounds are pollutants coming mainly from activities that use fossil fuels. Within this class are the BTEX (benzene, toluene, ethylbenzene and xylenes) compounds that are considered hazardous. Among the various existing techniques for degradation of pollutants, there is advanced oxidation using H2O2 generating hidoxil radical ( OH). In this work, the mesoporous material of MCM-41 was synthesized by hydrothermal
method and then was used as support, the impregnation of titanium by the method of synthesis with excess solvent to obtain the catalyst Ti-MCM-41. The catalyst was used in the
reaction catalyzed removal of BTEX in water using H2O2 as oxidant. The materials were characterized by: XRD, TG/DTG, FTIR, nitrogen adsorption-desorption and FRX-EDX, in
order to verify the method of impregnation of the mesoporous titanium support was effective. Catalytic tests were carried out in reactors of 20 mL containing BTEX (100.0 μg/L), H2O2
(2.0 M) and Ti-MCM-41 (2.0 g/L) in acid medium. The reaction occurred for 5 h at 60 ?C and analysis were performed by gas chromatography with photoionization detector and static
headspace sampler. The characterizations have proven the effectiveness of the synthesis method used and the incorporation of titanium lt in the support. The catalytic tests showed satisfactory results with conversion of more than 95 % for the studied compounds, where the catalyst 48% Ti-MCM-41 showed a higher removal efficiency of the compounds under study / Os Compostos Org?nicos Vol?teis s?o poluentes oriundos, principalmente, de atividades que utilizam combust?veis fosseis. Dentro desta classe encontram-se os BTEX (benzeno, tolueno, etilbenzeno e xilenos) que s?o compostos considerados perigosos. Dentre as varias t?cnicas existentes para degrada??o de poluentes, destaca-se a oxida??o avan?ada utilizando H2O2 para gera??o do radical hidoxil ( OH). Neste trabalho, o material mesoporoso do tipo MCM-41 foi sintetizado atrav?s do m?todo hidrot?rmica e em seguida foi utilizado como suporte, na impregna??o de tit?nio pelo m?todo p?s-s?ntese com excesso de solvente para a obten??o do catalisador Ti-MCM-41. O catalisador foi utilizado na cat?lise da rea??o de remo??o dos
BTEX em meio aquoso utilizando H2O2 como oxidante. Os materiais obtidos foram caracterizados por: DRX, TG/DTG, FTIR, adsor??o/dessor??o de N2, FRX-EDX, com o objetivo de verificar se o m?todo de impregna??o do tit?nio no suporte mesoporoso foi eficiente. Os testes catal?ticos foram realizados em reatores de 20 mL contendo solu??o aquosa de BTEX (100,0 μg/L), H2O2 (0,1 M) e Ti-MCM-41 (2,0 g/L) em meio acido. A rea??o ocorreu por 5 h a 60 ?C e as analises foram feitas por cromatografia a g?s com detector de fotoionizacao e amostrador por headspace est?tico. As caracteriza??es comprovaram a efic?cia do m?todo de s?ntese utilizado, assim como a incorpora??o do tit?nio no suporte. Os testes catal?ticos apresentaram resultados satisfat?rios na remo??o de mais de 95 % para os compostos
estudados, onde o catalisador 48% Ti-MCM-41 apresentou uma maior efici?ncia na remo??o dos compostos em estudo
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17656 |
| Date | 30 January 2012 |
| Creators | Morais, Lidiane Alves de |
| Contributors | CPF:35530502415, http://lattes.cnpq.br/9770622597949866, Guedes, Ana Paula de Melo Alves, CPF:03330987499, http://lattes.cnpq.br/5738717177200782, Castro, Francisco Laerte de, CPF:77862589491, http://lattes.cnpq.br/2913544384537886, Souza, Luiz Di, Ara?jo, Ant?nio Souza de |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Qu?mica, UFRN, BR, F?sico-Qu?mica; Qu?mica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| 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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