Dielectric and photocatalytic properties of sulfur doped TiO₂ nanoparticles prepared by ball milling

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• 作者：Mohammed Jalalah ; M. Faisal ; Houcine Bouzid ; Adel A. Ismail ; Saleh A. Al-Sayari
• 关键词：A. Inorganic compounds ; A. Oxides ; B. Intercalation reactions ; D. Optical properties
• 刊名：Materials Research Bulletin
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：48
• 期：9
• 页码：3351-3356
• 全文大小：996 K

文摘

Sulfur (S) doped commercial TiO₂ P-25 has been achieved by changing the amount of thiourea using ball milling technique. The results of XRD clearly reveal biphasial anatase and rutile mixtures for all prepared samples and doping of S does not change the morphology of the TiO₂. The optical absorption edge of S-doped TiO₂ was red shifted with indirect bandgap energy of 2.8 eV. The dielectric studies confirm that the dielectric constant of TiO₂ increases after doping, however it becomes more conductive. Newly designed S-doped TiO₂ photocatalysts exhibited excellent photocatalytic performance for the degradation of methylene blue (MB) under visible light. The overall photocatalytic activity of 0.11 at. % S-doped TiO₂ was significantly 3-times higher than that of commercial TiO₂ P-25 and complete degradation of MB has taken place after 90 min of irradiation under visible light while only 35 % dye degraded when the reaction has been carried out in the presence of undoped TiO₂.