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DOI Prefix 10.20431 |
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International Journal of Advanced Research in Chemical Science
Volume-3 Issue-3, 2016, Page No: 25-36
Kinetic Modeling of Adsorption of Indigo Carmine (5, 5'-
Disulfonic Indigotin) on Peat
Maria Fernanda G.Vidal1,Patricia Antonio de Menezes Freitas1*
Escola de Engenharia Mauá, Instituto Mauá de Tecnologia
Praça Mauá 1, 09580-900, SP, São Caetano do Sul, SP, Brazil
Citation : Maria Fernanda G.Vidal and Patricia Antonio de Menezes Freitas, Kinetic Modeling of Adsorption of Indigo Carmine (5, 5'-
Disulfonic Indigotin) on Peat International Journal of Advanced Research in Chemical Science. 2016;3(3):25-36.
Abstract
The kinetic of Indigo Carmine (5,5'- disulfonic indigotin, 5,5'-DI) adsorption on fibrous peat (FP) and decomposed peat (DP), have been investigated at different temperatures (283, 298, 313) K at pH 2. The effect of particle size was studied considering the variation of grain size of each peat (2000-850, 850-600 and < 600) nm. The fibrous peat shows higher adsorption capacity than the decomposed peat, while under the same work conditions. The kinetics of adsorption of 5,5'-DI is discussed using three kinetic models, the first-order Lagergren model, the pseudo-second-order model, and the intraparticle diffusion model. The adsorption of 5, 5'-DI onto peat proceeds according to the pseudo second-order model and the correlation coefficients were very close to 1. At 283, 298 and 313 K the maximum sorption, qmax,calc, for the initial concentration (Co = 4.05 × 10-5 mol L-1) of 5,5´-DI were qmax,calc is (5.57, 7.92 e 8.29) × 10-4 g g-1 for fibrous peat and (5.29, 6.74 e 5.83) × 10-4 g g-1 for decomposed peat. The intraparticle diffusion of 5,5'-DI molecules within the peat particles was identified as the rate-limiting step.
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