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980752 
Journal Article 
Studies on defluoridation of water using magnesium titanate 
Gopal, V; Elango, KP 
2010 
Yes 
Indian Journal of Chemical Technology
ISSN: 0971-457X 
17 
1 
28-33 
English 
WOS:000274954400003 
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(-1) of fluoride solution at 30 degrees C was found to be 0.029 mg g(-1). The system variables studied include initial concentration of the sorbate (2-10 mg L(-1)), adsorbent dose (0.5-5 g/50 mL), agitation time (5-60 min), pH (3-11), co-ions (Cl(-), SO(4)(2-), NO(3)(-), and HCO(3)(-)) and temperature (30-50 degrees C). The experimental data fitted satisfactorily (r>0.97) to the Langmuir isotherms. Thermodynamic parameters such as Delta H degrees, Delta S degrees and Delta G degrees concluded the adsorption is endothermic. The magnitude of the enthalpy change (20-45 kJ mol(-1)) indicated that the mechanism of adsorption process involves physisorption. 
Adsorption; Defluoridation; Isotherms; Magnesium titanate