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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

An investigation of phosphate adsorption from aqueous solution onto hydrous niobium oxide prepared by co-precipitation method

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Author(s):
Rodrigues, Liana Alvares [1] ; Caetano Pinto da Silva, Maria Lucia [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Sch Chem Engn, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS; v. 334, n. 1-3, p. 191-196, FEB 20 2009.
Web of Science Citations: 43
Abstract

The synthetic hydrous niobium oxide has been used for phosphate removal from the aqueous solutions. The kinetic data correspond very well to the pseudo second-order equation The phosphate removal tended. to increase with a decrease of pH. The equilibrium data describe very well the Langmuir isotherm. The peak appearing at 1050 cm(-1) in IR spectra after adsorption was attributed to the bending vibration of adsorbed phosphate. The adsorption capacities are high, and increased with increasing temperature. The evaluated Delta G degrees and Delta H degrees indicate the spontaneous and endothermic nature of the reactions. The adsorptions occur with increase in entropy (Delta S positive) value suggest increase in randomness at the solid-liquid interface during the adsorption. A phosphate desorbability of approximately 60% was observed with water at pH 12, which indicated a relatively strong bonding between the adsorbed phosphate and the sorptive sites on the surface of the adsorbent. (C) 2008 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 06/05421-0 - Synthesis of hydrous niobium oxide nanoparticles by reverse microemulsion
Grantee:Liana Alvares Rodrigues
Support Opportunities: Scholarships in Brazil - Master