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Previous issue date: 2012-05-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The groundwater pollution arising due to fuel leaks gas stations has presented a
problem aggravating. Increasingly studies related to environmental problems such accidents
and seek to propose some solutions for the treatment of groundwater and soils that are
contaminated by gasoline. This study evaluated the use of molecular sieve TiSBA-15 as a
catalyst for the reaction of removing of volatile organic compounds, particularly benzene,
toluene, ethylbenzene and xylenes, known as BTEX, one of the main pollutants found in
groundwater. The catalyst was synthesized by the method post-synthesis techniques and
characterized by XSD, TG/DTG, adsorption/desorption of N2, XRF-EDX, for checking the
incorporation of titanium and formation of the structure of the catalyst. The reaction occurred
with the presence of hydrogen peroxide, H2O2, in aqueous medium to form hydroxyl radicals,
which are needed in the process of removal of BTEX compounds. The catalytic reaction was
carried out for 5 hours at 60 ?C, pH to 3.0, and analyzes of the compounds were made in a gas
chromatograph with a flame detection means photoionization static headspace (HS-GC-PID).
The catalytic tests have shown the efficacy of using this type of catalyst for the removal of
these volatile organic compounds, having a removal rate of 90.60% in the range where the
catalyst was studied TiSBA-15(5,0) / A polui??o das ?guas subterr?neas devido a decorrentes vazamentos de combust?vel
por postos de gasolina tem se apresentado um problema agravante. Cada vez mais estudos
relacionam problemas ambientais com tais acidentes e procuram propor algumas solu??es
para o tratamento das ?guas subterr?neas e solos que s?o contaminados pela gasolina. Este
trabalho avalia o uso da peneira molecular TiSBA-15 como catalisador da rea??o de remo??o
de compostos org?nicos vol?teis, especificamente benzeno, tolueno, etilbenzeno e xilenos,
conhecidos como BTEX, um dos principais poluentes encontrados em ?guas subterr?neas. O
catalisador foi sintetizado pelo m?todo p?s-s?ntese e caracterizado pelas t?cnicas de DRX,
TG/DTG, adsor??o/dessor??o de N2, e FRX-EDX. O estudo da atividade catal?tica da TiSBA-
15 ocorreu com a presen?a de per?xido de hidrog?nio, H2O2, em meio aquoso, para a
forma??o de radicais hidroxilas, os quais ser?o necess?rios no processo de remo??o dos
compostos BTEX. A rea??o catal?tica foi realizada durante 5h a 60 ?C, pH igual a 5,0, e as
an?lises dos compostos foram feitas em um cromat?grafo a g?s com detec??o por
fotoioniza??o de chama via headspace est?tico (HS-GC-PID). Os testes catal?ticos mostraram
a efic?cia no uso deste tipo de catalisador para a remo??o desses compostos org?nicos
vol?teis, apresentando uma taxa de remo??o na faixa de 90,60%, onde o catalisador em estudo
foi o TiSBA-15(5,0)
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17678 |
| Date | 02 May 2012 |
| Creators | Alves, Camila Graciele Rolim |
| 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, 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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