Avaliação da adsorção de cobre a partir de carvão ativado obtido quimicamente do bagaço de cana de açúcar

• Autor(a) principal: Silva, Maria Clara Mendes da
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38708
• topic: carvão; cobre; efluentes; cana-de-açúcar; carbon; copper; effluents; sugar-cane; Engenharias.

The main objective of the work was to do an adsorption study with activated carbon produced from the sugarcane bagasse with a focus on the removal of copper metal from contaminated effluents. The experimental methodology of the study consistes of tests to evaluate the adsorption capacity of the activated carbon, in a batch system with a reactor with volume of 25 ml, aided by a thermostatic bath and a jacket. The tests were performed at a temperature of 30 ° C with Copper Sulphate solutions, which had concentrations of 200 ppm of Copper in a first test and 50 ppm of Copper in the other, both in contact with 25 mg of activated charcoal in each assay. Each trial had 24 hours long. Samples from each assay followed a collection sequence of 2, 4, 6, 22 and 24 hours. After each collection, a sample was taken to a centrifuge for a separation of each phase (solid = activated carbon, liquid = copper sulphate solution). Standard curves were prepared to determine a residual copper concentration in the solution after contact with the activated carbon from the atomic absorption spectroscopy equipment. From the calibration curve, it is possible to calculate the concentrations of the samples, which were also read to the atomic absorption spectrophotometry (AAS) equipment. For each copper concentration range there is a relative wavelength. In this case, the calibration curve was constructed with standards 1-280 ppm Copper Sulfate, whose corresponding wavelength is 222.6 nm. In the test with a solution of 200 ppm of Copper the removal was of 10% of Copper with 6 hours of contact. At the end of 24 hours the removal was 12%. For the second 50 ppm Copper test, 18% was obtained after 4 hours and there was no further significant removal from these 4 hours. The study showed a pseudo-second order kinetics and Freundlich isotherms for the two assays. For characterization carbon, FRX, DRX, MEV and BET analyzes were performed.