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