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Previous issue date: 2010-07-19 / Currently, the oil industry is the biggest cause of environmental pollution. The objective was
to reduce the concentration of copper and chromium in the water produced by the oil industry.
It was used as adsorbent natural sisal fiber Agave sp treated with nitric acid and sodium
hydroxide. All vegetable fibers have physical and morphological properties that enablies the
adsorption of pollutants. The basic composition of sisal is cellulose, hemicellulose and lignin.
The features are typically found in the characterization of vegetable fibers, except the surface
area that was practically zero. In the first stage of adsorption, it was evaluated the effect of
temperature and time skeeking to optimize the execution of the factorial design. The results
showed that the most feasible fiber was the one treated with acid in five hours (30?C). The
second phase was a factorial design, using acid and five hours, this time was it determined in
the first phase. The tests were conducted following the experimental design and the results
were analyzed by statistical methods in order to optimize the main parameters that influence
the process: pH, concentration (mol / L) and fiber mass/ metal solution volume. The volume /
mass ratio factor showed significant interference in the adsorption process of chromium and
copper. The results obtained after optimization showed that the highest percentages of
extraction (98%) were obtained on the following operating conditions: pH: 5-6,
Concentration: 100 ppm and mass/ volume: 1 gram of fiber/50mL solution. The results
showed that the adsorption process was efficient to remove chromium and copper using sisal
fibers, however, requiring further studies to optimize the process. / A ind?stria de petr?leo ? atualmente uma das principais causadoras da polui??o
ambiental. O objetivo deste trabalho foi reduzir a concentra??o de cobre e cromo na ?gua
produzida pela ind?stria petrol?fera. Foi usado como adsorvente a fibra de sisal natural,
tratada com ?cido n?trico e hidr?xido de s?dio. Todas as fibras vegetais possuem
caracter?sticas f?sicas e morfol?gicas que possibilitam a adsor??o de poluentes. A composi??o
b?sica do sisal ? celulose, hemicelulose e lignina. As caracter?sticas encontradas na
caracteriza??o s?o t?picas de fibras vegetais, com exce??o da ?rea superficial que foi
praticamente zero. Na primeira fase da adsor??o foi realizado um estudo a temperatura (30?C,
45?C e 60?C) e tempo para otimizar a realiza??o do planejamento fatorial. Os resultados
mostraram que a fibra mais vi?vel para o estudo ? a fibra tratada com ?cido ? 30?C durante 5
horas. A segunda fase foi a do planejamento fatorial, usando a fibra ?cida e o tempo de cinco
horas determinado na primeira fase. Os ensaios foram efetuados seguindo o planejamento
Fatorial 2 3. Os resultados obtidos foram analisados, atrav?s de m?todos estat?sticos, visando a
otimiza??o dos principais par?metros que influenciam no processo: pH, concentra??o (mol/L)
e rela??o massa de fibra (g)/ volume de solu??o (mL). Os resultados do planejamento
descrevem, o fator concentra??o e o fator massa/volume apresentam interfer?ncia significativa
no processo de adsor??o do cromo e cobre. Os resultados, ap?s a otimiza??o, demonstraram
que os maiores percentuais de extra??o (98 %) foram obtidos nas seguintes condi??es
operacionais: pH: 5-6, Concentra??o: 100 ppm e a rela??o massa /volume: 1grama de
fibra/50mL de solu??o. Observou-se que o processo foi eficiente com rela??o ? adsor??o do
cromo e cobre, contudo s?o necess?rios mais estudos para a otimiza??o do processo.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12957 |
| Date | 19 July 2010 |
| Creators | Borba, Loiva Liana Santos |
| Contributors | CPF:13893734449, http://lattes.cnpq.br/2791074318745945, Dantas, Tereza Neuma de Castro, CPF:07286937391, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783139Z0&dataRevisao=null, Santanna, Vanessa Cristina, CPF:77938780430, http://lattes.cnpq.br/9445575768909084, Moura, Maria Carlenise Paiva de Alencar, CPF:21414130368, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4702157Y9, Silva, Djalma Ribeiro da |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia do Petr?leo, UFRN, BR, Pesquisa e Desenvolvimento em Ci?ncia e Engenharia de Petr?leo |
| 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/embargoedAccess |
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