Sousa, João Fernandes deGalvão, Mayara Virgínia de Araújo2019-09-202021-09-272019-09-202021-09-272019-09-06GALVÃO, Mayara Virgínia de Araújo. Avaliação da capacidade de adsorção do carvão da pirólise do capim elefante na remoção do corante têxtil azul brilhante CB. 2019. 90f. Trabalho de Conclusão de Curso (Graduação em Engenharia Química) - Departamento de Engenharia Química, Universidade Federal do Rio Grande do Norte, Natal, 2019.https://repositorio.ufrn.br/handle/123456789/38797In recent years, Elephant Grass has been pointed as a promising alternative for biomass for use as an energy input. Through pyrolysis, elephant grass powder, originated from the dry straw grinding, stands out when submitted to the pyrolysis process, by generating bio-coal as a high yielding by-product. Elephant grass has a carbon-rich structure and is a potentially inexpensive alternative to the production of activated charcoal. In addition, this coal is made up of several oxide elements in its structure. The present work aimed to activate and characterize the charcoal from elephant grass pyrolysis and to evaluate its adsorption capacity in the removal of Bright Blue CB textile dye in synthetic effluent. The coal treatment and activation process involved the prewash steps (with automotive ethanol and dichloromethane), chemical activation (with 7.5 M and 1.0 M HCl as well as concentrated H3PO4) and physical activation at 500 °C for 2 hours with 1ml/min N2 flow. Finally, the coals were characterized by XRF, XRD and SEM. The adsorption studies were performed in batch, in a shaker with a rotation speed of 100 rpm and a temperature of 25 °C. The studied variables were: medium pH (2, 7 and 10) and dye solution concentration (50 and 100 ppm). A kinetic study with the assumption of a pseudo 1ª and 2ª order model was elaborated as well as the construction of adsorption isotherms based on the Langmuir and Freundlich model. An experiment performed without the adsorbent, but only with HCl (pH = 2) and dye solution, showed that 74% of the dye is degraded instantly within 30 sec. With NaOH, at pH 10, there was no degradation. The adsorption percentage obtained with commercial coal at pH 2, T = 25 °C and coal mass concentration of 1 g/L was around 60% in a time of 120 min. However, 1.0 M HCl activated pyrolysis coal washed with ethanol, dichloromethane and ethanol, tested under the same conditions as commercial coal, had an adsorption capacity of 82% in 250 min. For H3PO4 activated charcoal, regardless of the operating conditions, there was no interaction between the phases and, therefore, no adsorption. For commercial coal, the experimental results fit the Langmuir models and the second order pseudo kinetic (k2 = 0.00156 g / mg.min). For the pyrolysis coal, the Freundlich models and the first-order pseudo kinetic (k1 = 0.014 min-1) were used.Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/Azul Brilhante CBcarvão ativadopirólisecapim elefanteprocesso bateladaadsorçãomodelo cinéticoisotermasbachelorThesisEngenharias