Sousa, João Fernandes deBrasil, Jéssica Alves2019-09-302021-09-272019-09-302021-09-272019-09-02BRASIL, Jéssica Alves. Avaliação da capacidade de adsorção do carvão da pirólise do capim elefante em corantes têxteis RED S-B e amarelo C-RG. 2019. 83f. 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/123456789/38842Residues from industrial activities cause serious damage to the environment, especially to water bodies. Among these residues we can mention the effluents discarded by the textile industries, which are characterized by high load of organic chemical compounds. The dyes are the main waste of these effluents, being these compounds of difficult degradation and highly toxic to the environment. In this work the adsorption process in batch was studied to remove commercial textile dyes (red S-B and yellow C-RG) supplied by Vicunha Textile Industry Ltda using commercial coal as well as coal obtained from elephant grass pyrolysis. The pyrolysis charcoal was subjected to pre-wash, chemical (HCl and H3PO4), physical (N2 and T = 500ºC) and later characterization steps. The adsorption study was performed for both dyes in a shaker, with a liquid phase volume of 50 ml and a temperature of 25ºC. The studied variables were: medium pH (2, 7 and 10), initial solute concentration (5, 20 and 50 ppm) and adsorbent mass (50 and 100 mg). Under optimum operating conditions, the Langmuir and Freundlich isotherms were constructed, as well as an adsorption kinetics for the investigation of pseudo 1st and 2nd order models. Experimental results showed by FRX analysis that the coals (commercial and pyrolysis after washing) consist mainly of Ca (4.7 - 25.4), Fe (41.16 - 15.73%), K (10.95 - 1.9%) and Si (31.71 - 38.53%). The adsorption capacity was higher for commercial charcoal (2 g/L), adsorbing the yellow dye C-RG (50 ppm), whose value was 92.02% at pH = 2.0. While for pyrolysis coal, under the same conditions, the maximum removal percentage was 40.13% (treated with H3PO4). In a test performed with the mixture of the two dyes, commercial charcoal and under the same operating conditions, the removal percentage was 88%. For both commercial coal adsorbing yellow C-RG and for pyrolysis coal from grass, the Langmuir isotherm presented the best fit in relation to the experimental results. The calculated adsorption constant (KL) was 1.0 L/mg and the separation factor (RL) was 0.0219 indicating a favorable adsorption. Regarding the adsorption kinetics using the yellow dye, the model that best fit the experimental points was the second order pseudo for the two types of coal studied. The kinetic constants were 0.00485 g/mg.min (commercial coal) and 0.00285 g/mg.min (pyrolysis coal). With red S-B dye no good results were obtained.Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/CinéticaKineticsAdsorçãoCoranteCapim elefanteRed S-BAmarelo C-RGCarvão ativadoIsotermaAdsorptionElephant grassDyeYellow C-RGActivated charcoalIsothermbachelorThesisEngenharias.