NDLI: Adsorção de íons fosfato em óxido de nióbio hidratado

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Adsorção de íons fosfato em óxido de nióbio hidratado

Content Provider	Scilit
Author	Rodrigues, Liana Alvares Silva, Maria Lúcia Caetano Pinto da
Copyright Year	2009
Description	The adsorption kinetics of phosphate on Nb2O5.nH2O was investigated at initial phosphate concentrations 0.25, 0.50 and 1.00 mg.L-1. The kinetic process was described by a pseudo-second-order rate model very well. The adsorption thermodynamics was carried out at 298, 308, 318, 328 and 338 K. The positive values of both ΔH and ΔS suggest an endothermic reaction and increase in randomness at the solid-liquid interface during the adsorption. ΔG values obtained were negative indicating a spontaneous adsorption process. The Langmuir model described the data better than the Freundlich isotherm model. The effective desorption could be achieved using water at pH 12
Related Links	http://www.scielo.br/pdf/qn/v32n5/v32n5a23.pdf http://www.scielo.br/scielo.php?script=sci_pdf&pid=S0100-40422009000500023&lng=pt&nrm=iso&tlng=pt
Ending Page	1211
Page Count	6
Starting Page	1206
ISSN	01004042
e-ISSN	01004042
DOI	10.1590/s0100-40422009000500023
Journal	Química Nova
Issue Number	5
Volume Number	32
Language	English
Publisher	FapUNIFESP (SciELO)
Publisher Date	2009-01-01
Access Restriction	Open
Subject Keyword	Química Nova
Content Type	Text
Resource Type	Article
Subject	Chemistry

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