Caracterização do biossorvente Luffa Cylindrica in natura e funcionalizado e seu uso na remoção de eteraminas de soluções aquosas
Ano de defesa: | 2018 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Minas Gerais
UFMG |
Programa de Pós-Graduação: |
Não Informado pela instituição
|
Departamento: |
Não Informado pela instituição
|
País: |
Não Informado pela instituição
|
Palavras-chave em Português: | |
Link de acesso: | http://hdl.handle.net/1843/BUOS-B3DH6Y |
Resumo: | The reuse of water in industrial activities is a common practice and needed once this availability is increasingly limited. Among the activities in Brazil, the processing of iron ore concentration which is mainly froth flotation is a large consumer of water and with great potential for increasing the reuse. The etheramine, the quartz collector reagent on inverse froth flotation of iron ore, is contained in tailings pulp along with other reagents, making the water reuse in the process limited, being discharged in the effluent. It is in this context that the present work studied the use of adsorbent Luffa Cylindrica, popularly known as bucha vegetal as the initial step for the treatment of wastewater from froth flotation for the reuse of process water and prevention of contamination of water resources. Thus, the project investigates the adsorption of etheramine by Luffa Cylindrica from a synthetic solution. The adsorbent was characterized chemically through infrared spectrometry (FTIR) and, physically, evaluating the specific surface area, the BET and its electric nature through the determination of zeta potential. To enhance the adsorption of cationic compounds, a chemical treatment using citric acid was promoted on Luffa Cylindrica in order to increase the amount of active groups, in the case-COOH, on the surface of the adsorbent. The variables for the study of adsorption were : the time (0-2880) min, pH (4.7 .10, 12) and the adsorbent mass/volume of solution (10-20-30) mg/L. Under optimum conditions: pH 10, 20 mg/L, and the equilibrium adsorption attained within 1 (one) hour, the percentage (%) of etheramine removal was 87% and the amount of etheramine adsorbed per unit mass of adsorbent was 11 mg/g. The adsorption experimental data of etheramine on Bucha vegetal was best fitted to the Freudlich model rather then the others models, characterizing the adsorption with multilayer formation, proving the electrostatic character of Luffa Cylindrica-etheramine system and, the effect of surface area is negligible. This effect was also confirmed by 2nd Pseudo order kinetic model which was the best adjust to the system. Through the thermodynamic study, under the same variables, at temperatures of (30, 35 and 40) °C the adsorption has an exothermic heat (H =30.079 KJ/mol) and is spontaneous (G < 0), showing better adsorption capacity at the temperature of 30° C |