Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/5976
Title: Application of a new carboxylate-functionalized sugarcane bagasse for adsorptive removal of crystal violet from aqueous solution : kinetic, equilibrium and thermodynamic studies.
Authors: Ferreira, Bruno Christiano Silva
Teodoro, Filipe Simões
Mageste, Aparecida Barbosa
Gil, Laurent Frédéric
Freitas, Rossimiriam Pereira de
Gurgel, Leandro Vinícius Alves
Keywords: Sugarcane bagasse
Crystal violet
Meldrum's acid
Issue Date: 2015
Citation: FERREIRA, B. C. S. F. et al. Application of a new carboxylate-functionalized sugarcane bagasse for adsorptive removal of crystal violet from aqueous solution: kinetic, equilibrium and thermodynamic studies. Industrial Crops and Products, v. 65, p. 521-534, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0926669014006268>. Acesso em: 15 out. 2015.
Abstract: A new carboxylate-functionalized sugarcane bagasse (SMA) was prepared via a solvent-free procedure involving esterification of sugarcane bagasse with Meldrum’s acid. The optimized conditions provided SMA with a percent weight gain of 86.0% and 4.69±0.20 mmol/g of carboxylic acid groups. SMA was characterized by FTIR, TGA, elemental analysis and SEM. Kinetic experiments showed that the amount of crystal violet adsorbed increased with increasing temperature and equilibrium was reached at 12 h. Adsorption kinetics followed a pseudo-second-order model. The Arrhenius and Eyring models were used to obtain the activation energy and changes in free energy, enthalpy, and entropy of activation for the adsorption process. The calculated activation energy (14.14 kJ/mol) suggested physical adsorption of CV onto SMA. The equilibrium data were well fitted to the Langmuir and Sips isotherms. Maximum adsorption capacity was 692.1 mg/g at 45 ◦C. Thermodynamic parameters such as changes in free energy, enthalpy and entropy were also determined.
URI: http://www.repositorio.ufop.br/handle/123456789/5976
metadata.dc.identifier.doi: https://doi.org/10.1016/j.indcrop.2014.10.020
ISSN: 0926-6690
metadata.dc.rights.license: O periódico Industrial Crops and Products concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3734740524733.
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