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Title: Adsorption of MoO<sub>4</sub><sup>2-</sup> ions on Fe-treated tri-calcium phosphate
Authors: Gómez, J Serrano
Martínez, J Bonifacio
Reyes, M C López
Keywords: Adsorption isotherms
Calcium phosphate
Molybdate adsorption
Thermodynamic parameters
Issue Date: May-2012
Publisher: NISCAIR-CSIR, India
Abstract: The Fe-treated calcium phosphate (Fe-TPO<sub>4</sub>) has been prepared with FeCl<sub>3</sub> aqueous solution. The sorption of <sup>99</sup>MoO<sub>4</sub><sup>2-</sup> ions from aqueous solution using Fe-TPO<sub>4</sub> as adsorbent is investigated by batch experiments. Experiments have been performed as a function of shaking time, <i style="">p</i>H, solute concentration and temperature and the experimental rate data are tested with the pseudo-second-order rate model. The adsorption data as a function of molybdate concentration obey the Freundlich isotherm. Thermodynamic parameters <img src='/image/spc_char/delta.gif' border=0><i style="">H</i><sup>0</sup>, <img src='/image/spc_char/delta.gif' border=0><i style="">S</i><sup>0</sup> and <img src='/image/spc_char/delta.gif' border=0><i style="">G</i><sup>0</sup> have been calculated with data of temperature studies. The positive value of <img src='/image/spc_char/delta.gif' border=0><i style="">H</i><sup>0</sup> indicates that the adsorption of MoO<sub>4</sub><sup>2-</sup> ions on Fe-TPO<sub>4</sub> is an endothermic process.
Description: 167-172
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.19(3) [May 2012]

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