Preparation of high surface area TiO2 (anatase) by thermal hydrolysis of titanyl sulphate solution

Abstract

Highly crystalline, ultra fine TiO (anatase) having high surface area has been prepared by thermal hydrolysis of titanyl sulphate 2 solution and characterized using B.E.T surface area measurements, XRD and chemical analysis. The dependence of surface area on concentration of staffing solution, temperature of hydrolysis, duration of boiling and calcination temperature were also studied. As the boiling temperature, duration of boiling and calcination temperature increased, the surface area of TiO formed decreased significantly. 2 On increasing calcination temperature, the crystallite size of TiO also increased and gradually the phase transformation to rutile took 2 place. The onset and completion temperatures of rutilation were 700 and 10008C, respectively.

Hydrothermal Synthesis of Nanodispersed Titanium Dioxide

“…Зокрема, гідроліз тетрабу-токсиду титану в суміші H 2 O -EtOH -HCl при висо-кому вмісті прекурсору призводить до формування аморфного гелю, а при високих -до утворення гелю з переважаючим вмістом анатазу [53]. Термообробка аморфних гідрогелів в температурному діапазоні 350-500°С призводить до кристалізації анатазу [54][55][56]. Прожарювання при температурах 500-1100°С веде до отримання суміші анатазу і рутилу або моно-фазного рутилу [54][55][57][58].…”

“…Авторами [56] виявлено, що при гідротермальному осадженні TiO 2 з розчину TiOSO 4 площа поверхні залежить від концентрації прекурсору і впливає на форму наночастинок, яка змінюється від голкоподібної до сферичної. Відмін-ності у формі частинок обумовлена різними механіз-мами їх росту при різних концентраціях продуктів гідролізу прекурсорів [85].…”

Photocatalytic conversion of NO using TiO2–NH3 catalysts in ambient air environment

“…A TiO 2 catalyst using Ti(O-Bu) 4 as a precursor was prepared by a hydrothermal reflux method [31][32][33][34] with the following procedure: 17.28 ml of Ti(OC 4 H 9 ) 4 was dissolved in 115 ml of absolute ethanol to obtain a sol mixture; Then 20 ml of 2 mol l A TiO 2 catalyst using TiOSO 4 as a precursor was prepared by the hydrothermal reflux method [31][32][33][34], in which 20 g of TiOSO 4 was dissolved into a mixture solution with 100 ml of absolute ethanol and 400 ml of distilled water. The mixture solution was refluxed at 353 K for 2 h. After filtered and washed four times, the collected powder was then washed with 1000 ml of 2 mol l -1 NH 3 •H 2 O solution and was dried at 373 K for 24 h. The product TiO 2 sample was named TOSO-NH 3 .…”

“…Hydrothermal processes can be applied to synthesize the TiO 2 -based catalysts with high surface area and crystallinity. [27][28][29][30][31][32][33][34] In this study, several TiO 2 -based catalysts were prepared by either a moderate-temperature hydrothermal process [27][28][29][30] or a hydrothermal reflux process [31][32][33][34]. NO conversion was evaluated in the presence of air under LIGHT irradiation and the effect of hydrothermal processes on the NO conversion efficiency was investigated.…”

Effects of processing parameters on hydrolysis of TiOSO4

“…Yasir et al 33 investigated the influence of solution concentration, temperature, the time of the process at the boiling point and the calcination temperature of hydrolysis' product on the specific surface area of anatase obtained in reactions. An increase of temperature, hydrolysis time, and calcination temperature lead to a significant decrease of TiO 2 specific surface area.…”