Synthesis, Characterisation and Photocatalytic Tests of Anatase Titanium Dioxide Powders Prepared Via Sol-Gel with Different Chelating Agents and under Different Gelling Pressure Conditions

TiO2-Anatase powders for photocatalytic applications: sol-gel synthesis and relative thermal characterization

Synthesis, Characterisation and Photocatalytic Degradation of 4-Nitrophenol in Aqueous Phase by Using TiO2 Powders Prepared via Sol-Gel Method under Different Gelling Pressure Conditions

Pyrolysis Study of Sol-Gel Derived TiO2 Powders Part IV. TiO2-anatase Prepared by Reacting Titanium(IV) Isopropoxide without Chelating Agents

Pyrolysis study of sol-gel derived TiO2powders

An amorphous TiO2 gel was obtained by hydrolysing titanium(IV) isopropoxide with a stoichiometric amount of water using SnCl2 as catalyst. In these operative conditions, a TiO2 gel matrix containing a lower fraction of organic residual was obtained with respect to samples prepared by previously modifying the titanium alkoxide precursor with chelating ligands. Dried gel powders were characterized by N2 adsorption analyses, FT-IR and XRD measurements. Thermogravimetric (TG) and differential thermal analysis (DTA) coupled with mass spectrometric (MS) and gas chromatographic (GC) measurements were performed in order to identify the organic products released from TiO2 gel pyrolysis. The Tg-MS se…

Pyrolysis Study of Sol-Gel Derived TiO2 Powders Part III. TiO2-anatase Prepared by Reacting Titanium(IV) Isopropoxide with Acetic Acid

Photocatalytic activity of nanocrystalline TiO2 (brookite, rutile and brookite-based) powders prepared by thermohydrolysis of TiCl4 in aqueous chloride solutions

Abstract Nanocrystalline TiO2 powders were synthesized by thermohydrolysis of TiCl4 in HCl or NaCl aqueous solutions. Rutile, mixtures of brookite and rutile or mixtures of anatase, brookite and rutile were obtained depending on the acidity of the medium. Crystalline phases and composition of the mixtures were identified by using XRD analysis. Pure brookite nanoparticles, separated from the mixtures of brookite and rutile by simple peptization with water, were stable against transformation to rutile up to 750 °C. The prepared TiO2 powders were characterized by thermal analysis, diffuse reflectance spectroscopy and BET surface area determinations. The band gap of bulky brookite was estimated…