Adsor??o de cobre e cromo utilizando fibra de sisal visando o tratamento da ?gua produzida pela ind?stria petrol?fera

• Main Author: Borba, Loiva Liana Santos
• Other Authors: CPF:13893734449
• Format: Others
• Language: Portuguese
• Published: Universidade Federal do Rio Grande do Norte 2014
• Subjects: Adsor??o; Cromo; Cobre; Sisal; Fibra vegetal; Agave.; Adsorption; Chromium; Copper; Vegetable fiber; CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA::TECNOLOGIA QUIMICA::PETROLEO E PETROQUIMICA
• Online Access: http://repositorio.ufrn.br:8080/jspui/handle/123456789/12957

Made available in DSpace on 2014-12-17T14:08:47Z (GMT). No. of bitstreams: 1 LoivaLSB_DISSERT.pdf: 3990836 bytes, checksum: 3537e4304659ead550f1c758b72dbbce (MD5) 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.