Abstract

Amir Hossein Haghighaty and Shahram Moradi Dehaghi

DOI : http://dx.doi.org/10.13005/ojc/340256

In this research, initially after preparing γ-alumina and Fe(III) doped γ-alumina  prepared by the sol-gel method, the initial calcination of the sols was carried out for 3 h at 300°C and the obtained pulverized solid crystals were added into two sol-gel containers consisting of titanium tetra iso-propoxide (TTiP) and Fe(III) doped TTiP . After homogenization, the new sol was for 24 h and calcinated for 4 h at 600°C. After the process of washing and purification, the core-shells were prepared and characterized. The photocatalytic properties were compared to those of the pure TiO₂, which had been prepared by the sol-gel method. Some of the properties of these new synthesized particles include increased effective surface area of TiO₂ intake feed, increased activity of photocatalytic properties in terms of the alkaline pH, and enhanced strength of the core shell particles in the process of mechanical separation during the reactivation steps up to 10 times of recovery. Photocatalytic activity was examined by degradation of methylen blue. Doping Fe (III) in the core of γ-alumina, increased the mechanical stability while doping Fe (III) in the TiO₂ shell decreased the time of degradation and increased the stability of the catalyst in an alkaline solution to a pH of about 12.

Core-Shell; TiO2/γ-Al2O3; Photocatalyst; Sol-Gel; Dopant; Composite

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