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Title: Studies on defluoridation of water using magnesium titanate
Authors: Gopal, V
Elango, K P
Keywords: Adsorption
Magnesium titanate
Issue Date: Jan-2010
Publisher: CSIR
Abstract: Batch sorption system using magnesium titanate as an adsorbent was investigated to remove fluoride ions from the aqueous solution. The amount of fluoride adsorbed from 4 mg L<sup>-1</sup> of fluoride solution at 30<sup>o</sup>C was found to be 0.029 mg g<sup>-1</sup>. The system variables studied include initial concentration of the sorbate (2-10 mg L<sup>-1</sup>), adsorbent dose (0.5-5 g/50 mL), agitation time (5-60 min), <i style="">p</i>H (3-11), co-ions (Cl<sup>-</sup>, SO<sub>4</sub><sup>2-</sup>, NO<sub>3</sub><sup>-</sup>, and HCO<sub>3</sub><sup>-</sup>) and temperature (30-50<sup>o</sup>C). The experimental data fitted satisfactorily (r>0.97) to the Langmuir isotherms. Thermodynamic parameters such as <img src='/image/spc_char/delta.gif' border=0><i style="">H</i><sup>o</sup>, <img src='/image/spc_char/delta.gif' border=0><i style="">S</i><sup>o</sup> and <img src='/image/spc_char/delta.gif' border=0><i style="">G</i><sup>o</sup> concluded the adsorption is endothermic. The magnitude of the enthalpy change (20-45 kJ mol<sup>-1</sup>) indicated that the mechanism of adsorption process involves physisorption.
Description: 28-33
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.17(1) [January 2010]

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