HIGH SURFACE AREA Ag-TiO2 NANOTUBES FOR PHOTOCATALYTIC
N. Pugazhenthiran and S. Murugesan
School of Chemistry, Madurai Kamaraj University,
Madurai - 625 021, India
Titanium dioxide nanotubes (TiO2 NTs) with very high surface area (469 m2/g) have been synthesized through a simple hydrothermal method and their surface has been modified using silver nanoparticles (Ag NPs). The Ag NPs deposited TiO2 NTs (Ag-TiO2 NTs) show an extended optical response from UV to visible region coupled with a surface plasmon resonance band and thus can be utilized as a plasmonic photocatalyst. The photoluminescence intensity of TiO2 NTs is lower than that of TiO2 nanoparticles due to the delocalization of photogenerated electrons along the one dimensional nanotubes which reduces the rate of charge recombination. The Ag-TiO2 NTs exhibit excellent photocatalytic activity towards the degradation of ceftiofur sodium (CFS) due to high surface area and mesoporosity of TiO2 NTs. The addition of peroxomonosulfate in the photocatalytic system greatly amplifies the CFS degradation owing to the simultaneous generation of both •OH and SO4• . The catalyst retains its photocatalytic activity at least up to four consecutive cycles.