期刊
CHEMICAL ENGINEERING JOURNAL
卷 284, 期 -, 页码 1328-1341出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.09.085
关键词
Dye aggregation; Multi layer adsorption; Phenomenological modeling; Rate-limiting step; Sugarcane bagasse characterization
资金
- CAPES (Coordination for the Improvement of Higher Education Personnel)
- Araucaria Foundation
- CNPq (National Counsel of Technological and Scientific Development)
A phenomenological model for multilayer liquid phase adsorption in closed and batch system was developed to assess the diffusional resistances and the adsorption rate-limiting steps. Equilibrium, kinetic and thermodynamic results indicated a multilayer adsorption behavior, wherein two adsorption steps were identified: (i) monolayer adsorption, with chemisorption characteristic binding energy due to synergistically electrostatic and H-bond intermolecular interactions; (ii) multilayer adsorption, favored by high dye concentrations and temperatures, however presenting a physical biding energy, related to less intense interactions such as H-bond and van der Waals forces. Additionally, dye aggregation in the liquid phase was observed and investigated. The proposed adsorption model allowed to investigate physically the kinetics, equilibrium and thermodynamics through a unique approach and to elucidate the mechanisms in distinct operational conditions. Hence, this mechanistic and predictive model can be used for the optimization and scale-up of the multilayer adsorption processes. (c) 2015 Elsevier B.V. All rights reserved.
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