tarek_ali

Tarek T. Ali

Professor - Professor

Faculty of science

Address: Chemistry Department, Faculty of Science, Sohag University, Sohag, P.O.Box 82524, Egypt

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2013 | Keywords peptization sol–gel TiO2,
Titania nanoparticles by acidic peptization of xerogel formed by hydrolysis of titanium(IV) isopropoxide under atmospheric humidity conditions
Thermally stable nanoparticles (NPs) of anatase phase titania, TiO2, were prepared by calcinations of acidic peptization products of titania xerogel, TiO2∙xH2O, that formed via an eco-friendly method. The method was based on hydrolysis of titanium isopropoxide over a long time period under atmospheric conditions (temperature 25 ± 5 °C and humidity 50 ± 10‰). Acidic peptization accompanied with ultrasonic vibrations ... Read more

Effect of synthesis methods for mesoporous zirconia on its structural and textural properties
Zirconia was synthesized by sol–gel and posthydrothermal treatment under autogenous pressure in order to study the effect of synthesis methods on its structural and textural properties. On the basis of thermal analysis, in situ X-ray diffraction and Raman spectroscopy techniques, the synthesis processes exhibit similar thermal behavior and zirconia phase transformation. The effect of in situ calcination temperature on the ... Read more

2013 | Keywords TiO2 Flame spray pyrolysis,
Photocatalytic activity of doped and undoped titanium dioxide nanoparticles synthesised by flame spray pyrolysis
The photocatalytic activities of a series of titanium dioxide (TiO2) based nanoparticles, synthesised via flame spray pyrolysis (FSP), have been investigated and compared with the commercially available Evonik Aeroxide® TiO2 P 25 (P 25). The effects of metal ions aluminium, tin and platinum, respectively, on the physical and chemical properties of the TiO2 nanoparticles are reported. The set of six ... Read more

Effect of iron oxide loading on the phase transformation and physicochemical properties of nanosized mesoporous ZrO2
Mesoporous ZrO2-supported iron oxide materials were prepared with nominal loadings of iron oxide of 5, 10, 15 and 20 wt.% using a modified co-precipitation method. The physicochemical properties of the catalysts were characterized by thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, Raman spectroscopy, high resolution transmission electron microscopy, N2 adsorption, X-ray photoelectron spectroscopy and infrared spectroscopy methods. A delay in ... Read more

2012 | Keywords Photocatalysis Degradation,
Laboratory scale water circuit including a photocatalytic reactor and a portable in-stream sensor to monitor pollutant degradation
We describe a lab-scale closed-circulating test system for photocatalytic wastewater treatment. The system comprises a UV-LED photoreactor, a microcirculating fluid pump, and an in-stream sensor unit. The reactor can hold volumes up to 250 mL and is optimized to study the degradation of pollutant concentrations in the microgram to milligram per liter range using photocatalysts fixed to a planar surface ... Read more

Copper substituted heteropolyacid catalysts for the selective dehydration of ethanol
The catalytic conversion of ethanol was carried out over H3PMo12O40·xH2O (H3PMo) and its substituted copper ions with formula Cu0.5xH3−xPMo12O40 (where x = 1, 2 and 3). Pure and Cu-substituted catalyst samples were calcined at 350 ◦C. The effect of copper ions substitution on the thermal behaviour, structural, acidic, surface and catalytic properties of the investigated samples were studied using TG, ... Read more

Direct Formation of Thermally Stabilized Amorphous Mesoporous Fe2O3/SiO2 Nanocomposites by Hydrolysis of Aqueous Iron (III) Nitrate in Sols of Spherical Silica Particles
Nanocomposite materials containing 10% and 20% iron oxide/silica, Fe2O3/SiO2 (w/w), were prepared by direct hydrolysis of aqueous iron (III) nitrate solution in sols of freshly prepared spherical silica particles (Sto¨ber particles) present in their mother liquors. This was followed by aging, drying, calcination up to 600 °C through two different ramp rates, and then isothermal calcinations at 600 °C for ... Read more