Ferreira, Bruno Christiano SilvaTeodoro, Filipe SimõesMageste, Aparecida BarbosaGil, Laurent FrédéricFreitas, Rossimiriam Pereira deGurgel, Leandro Vinícius Alves2015-12-152015-12-152015FERREIRA, 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. 2015.0926-6690http://www.repositorio.ufop.br/handle/123456789/5976A 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.en-USSugarcane bagasseCrystal violetMeldrum's acidArtigo publicado em periodicoO periódico Industrial Crops and Products concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3734740524733.https://doi.org/10.1016/j.indcrop.2014.10.020