Tổng hợp TiO2 anatase kích thước nanomet bằng phương pháp đốt cháy gel.

Abstract

Titanium dioxide powder has been  synthesised at low temperature (500⁰C) by the combustion of gel prepared from  polyvinyl alcohol (PVA) and titanium nitrates.Factors affecting on particle sizes of TiO₂ such as the PH of solution, temperature of gel formation, mole ratio of concentration of  titanium and  polyvinyl alcohol, temperature of calcinating have been investigated.The nanoparticle TiO₂ anatase characterizations were examined by X-ray Diffraction (XRD), Thermogravimetric and Differential Thermal Analysis (TG-DTA), Scanning Electron Microscopy (SEM) and BET ( Brunaure-Emmet-Teller) measurements. Further thermal treatment at 500^oC in 2h yields the single phase TiO₂ anatase with average primary size < 20 nm. It specific surface area is  50 m²/g for TiO₂.