Miki Kanna, Panit Sherdshoopongse and Phadoong Boonsin

pp. 1017 - 1026

Abstract

Titanium dioxide was prepared from titanium tetrachloride and diluted ammonia solution at low
temperature. The product obtained was characterized by XRD, EDXRF, TGA, DSC, and FT-IR techniques.
It was found that the product was in the form of hydrated amorphous titanium dioxide, TiO₂·1.6H₂O (haTiO₂). Ha-TiO₂
 exhibits high BET surface area at 449 m²/g. Adsorptions of metal ions onto the ha-TiO₂
surface were investigated in the batch equilibrium experiments, using Mn(II), Fe(III), Cu(II), and Pb(II)
solutions. The concentrations of metal ions were determined by atomic absorption spectrometer. The
adsorption isotherms of all metal ions were studied at pH 7. The adsorption of Mn(II), Cu(II), and Pb(II)
ions on ha-TiO₂ conformed to the Langmuir isotherm while that of Fe(III) fit equally well to both Langmuir
and Freundlich isotherms.

Keywords

• titanium dioxide
• amorphous titanium dioxide
• metal oxide surface
• Degussa P25
• metal ion adsorption
• Langmuir isotherm
• Freundlich isotherm
• solid-phase extraction
• preconcentration