Fe doped TiO2 powder synthesized by sol gel method: structural and photocatalytic characterization
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Fe doped TiO2 samples were synthesized using sol–gel technique and its incorporation was studied using different experimental tools such as XRD, HRTEM, and XPS. It was observed that the TiO2 maintains the anatase phase when the Fe doping concentration is below 3 % or below. A structural transformation from anatase to rutile was observed when the doping concentration reaches 4 %. Fe doping inhibits the crystalline growth and the crystal size of 3 % Fe doped TiO2 was half of the undoped TiO2. The Fe segregation in TiO2 was identified by studying HAADF images. The Fe doping caused an apparent red shift in the absorption edge of TiO2. Photocatalytic experiments show that Fe3+ doping has considerably improved the decomposition of the organic component. With 0.5 % Fe doped TiO2 in 120 min, 88 % of the dye was degraded compared to 44 % degradation achieved by pure TiO2. The slight decrease in the photocatalytic activity for the 4 % Fe: TiO2 can be attributed to the change in structural phase.
KeywordsTiO2 Rutile Photocatalytic Activity Raman Band Anatase Phase
The authors wish to thank Maria Luisa Ramón for the XRD analysis; O. Gomez Daza and José Campos for general assistance in the laboratory. The TiO2 material used in this work was developed for the project CeMIE-Sol 207450/P28
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