Ag doped TiO2 nanoparticles prepared by hydrothermal method and coating of the nanoparticles on the ceramic pellets for photocatalytic study Surface properties and photoactivity


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Avcıata O. , Gördük S.

International Congress on Fundamental and Applied Sciences 2016 (ICFAS2016), İstanbul, Türkiye, 22 - 26 Ağustos 2016, ss.148-149

  • Basıldığı Şehir: İstanbul
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayısı: ss.148-149

Özet

TiO2 is the most effective because of its high photosensitivity, chemical stability, low cost, easy availability and environmental friendly. However, a major disadvantage of TiO2 is the large band gap of 3.2 eV which limits its activity. To overcome these restrictions of TiO2, many studies have been perform to enhance the electron–hole separation and to extend the absorption range of TiO2 into the visible region and UV region. These studies included deposition of noble metals onto the TiO2 surface [C. A. Martinez–Huitle, E. Brillas, Applied Catalysis B: Environmental, 87 (2009) 105–145 ], [H. Y. Chuang, D.–H. Chen, Nanotechnology 20 (2009) 105704 ]. Among the metallic species which can be incorporated onto TiO2 surface, Ag has shown an enhanced electron-hole separation and interfacial charge transfer ability, as well as the increase of the visible light and UV light excitation of TiO2 [I. H. Chowdhury, S. Ghosh, M. K. Naskar, Ceramics International 42 (2016) 2488–2496 ]. In this work, Ag doped nano TiO2 photocatalysts were synthesized in powder form by hydrothermal method at 180◦C in 120 min. using different reduction agents. The synthesized powders were characterized by powder XRD, EDS, BET, TEM and SEM analyses. The effect of reduction agents on the morphological properties of Ag doped nano TiO2 has been studied. We have been observed that the use of different reduction agents affects the particle size and surface area. Ag doped nano TiO2 photocatalysts were coated to the ceramic pellets by dip coating technique for photocatalytic study. Photocatalytic properties of the synthesized powder were examined with indigo blue (IB) solution under UV irradiation. Periodical UV spectrophotometric analysis showed that indigo blue (IB) has been degraded and its concentration has decreased under UV irradiation by time.