Photocatalytic degradation of Direct Yellow 50 on TiO2 and Fe3+-doped TiO2 semiconductor nanoparticles under UV light irradiation
Mahmoud G.E.A.* and L. F. M. Ismail
Chemistry Department Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt
Abstract: Fe3+-doped TiO2 composite nanoparticles (Fe3+ = 0.01wt %) were successfully synthesized using an incipient wet impregnation method in order to prevent penetration of the dopant cation into the bulk of TiO2. The prepared nanoparticles were characterized by SEM, EDX, XRD and TEM. Results show that the size of Fe3+/TiO2 particles decreases on doping with Fe3+ and their XRD beaks are broaden. Doping Fe3+ can control the conversion of TiO2 from anatase to rutile. The photocatalytic degradation of Direct Yellow 50 was used as a model reaction to evaluate the photocatalytic activity of TiO2 and Fe3+-doped TiO2 nanoparticles. The doping amount of Fe3+ remarkably affects the activity of the catalyst. The degradation of dye depends on several parameters such as pH, catalyst, substrate and H2O2concentrations. Electrical energy per order (EE/O) was proposed to assess the relative performance of catalytic system used. The adsorption of direct yellow 50, onto TiO2 Degussa P25 from aqueous solution was investigated. The experimental data were analyzed by Langmuir and Freundlich models of adsorption. It was found that Langmuir equation fit better than Freundlich equation. The kinetics of the adsorption with respect to the initial dye concentration, were also investigated.
[Mahmoud G.E.A. and L. F. M. Ismail. Photocatalytic degradation of Direct Yellow 50 on TiO2 and Fe3+-doped TiO2 semiconductor nanoparticles under UV light irradiation. J Am Sci 2012;8(10):83-99]. (ISSN: 1545-1003). http://www.jofamericanscience.org. 14
Key words: DY50, Fe3+-doped TiO2, photocatalysis, adsorption. Full Text 14