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Visible light-sensitive yellow TiO2−xNx and Fe-N co-doped Ti1−yFeyO2−xNx anatase photocatalysts |
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| Authors: | K.S. Rane R. Mhalsiker T. Sato E. Dunbar |
| Affiliation: | a Department of Chemistry, Goa University, Panaji City, Goa 403206, India b Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katachira, Aoba-ku, Sendai, Miyagi 980-8577, Japan c Environmental Engineering Science, School of Engineering and Applied Sciences, Washington University in St. Louis, One Brooking Drive, Campus Box 1180, St. Louis, MO 63130-4899, USA |
| Abstract: | Nitrogen substituted yellow colored anatase TiO2−xNx and Fe-N co-doped Ti1−yFeyO2−xNx have been easily synthesized by novel hydrazine method. White anatase TiO2−δ and N/Fe-N-doped samples are semiconducting and the presence of ESR signals at g ∼1.994-2.0025 supports the oxygen vacancy and g∼4.3 indicates Fe3+ in the lattice. TiO2−xNx has higher conductivity than TiO2−x and Fe/Fe-N-doped anatase and the UV absorption edge of white TiO2−x extends in the visible region in N, Fe and Fe-N co-doped TiO2, which show, respectively, two band gaps at ∼3.25/2.63, ∼3.31/2.44 and 2.8/2.44 eV. An activation energy of ∼1.8 eV is observed in Arrhenius log resistivity vs. 1/T plots for all samples. All TiO2 and Fe-doped TiO2 show low 2-propanol photodegradation activity but have significant NO photodestruction capability, both in UV and visible regions, while standard Degussa P-25 is incapable in destroying NO in the visible region The mid-gap levels that these N and Fe-N-doped TiO2 consist may cause this discrepancy in their photocatalytic activities. |
| Keywords: | Hydrazine Oxalate precursor Oxalate-hydrazinate precursor Anatase Arrhenius plots Electrical conductivity N-TiO2 XPS-N 1s peak Photodegradation ESR Fe-N co-doped TiO2 |
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