Adsorção de cobre e cromo utilizando fibra de sisal visando o tratamento da água produzida pela indústria petrolífera
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 veg...
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| Format: | Dissertação |
| Jezik: | por |
| Izdano: |
Universidade Federal do Rio Grande do Norte
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| Online pristup: | https://repositorio.ufrn.br/jspui/handle/123456789/12957 |
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| Sažetak: | 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. |
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