Abstract
In this research, nitrogen and iron (III) co-doped nano TiO2 (N-Fe-TiO2) was prepared by sol-gel method using ammonium chloride and iron chloride solutions as nitrogen and iron sources, respectively. The effect of synthesis parameters (weight ratios of N/TiO2 and Fe/TiO2, synthesis temperature, calcination time and temperature) was simultaneously investigated on the quality of the N-Fe-TiO2 product by a two-level Placket–Burman experimental design. The synthesized powders were characterized by XRD, XPS and UV–Vis spectroscopy techniques. The mean crystal size and anatase content were determined and evaluated as the linear functions of so-called synthesis parameters by the statistical analysis and regression. The 2%N-1%Fe-TiO2 product by 11nm mean crystal size and 78% anatase content, synthesized at 35°C and calcined at 500°C during 2h, exhibited the most significant activity during the photo-degradation of acetaldehyde under visible light irradiation and its efficiency was obtained about four times more than photocatalytic activity of Degussa TiO2-P25.
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