High surface area Ag-TiO2 nanotubes for solar/visible-light photocatalytic degradation of ceftiofur sodium.
Titanium dioxide nanotubes (TiO2 NTs) with very high surface area (469 m(2)/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 Langmuir adsorption constant of Ag-TiO2 NTs (for ceftiofur sodium adsorption) is twice that of P25 TiO2. The Ag-TiO2 NTs exhibit excellent photocatalytic activity toward 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.
School of Chemistry, Madurai Kamaraj University, Madurai 625021, India.
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N
Pugazhenthiran
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Murugesan
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Anandan
D000327:Adsorption; D002384:Catalysis; D002511:Cephalosporins / Q000032:analysis*; D004583:Electrons; D017665:Hydroxyl Radical; D007700:Kinetics; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D043942:Nanotubes / Q000737:chemistry*; D055095:Optics and Photonics; D009930:Organic Chemicals / Q000032:analysis; D055668:Photochemical Processes; D012834:Silver / Q000737:chemistry*; D013472:Sunlight; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis; D014961:X-Ray Diffraction
D002511:Cephalosporins; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D017665:Hydroxyl Radical; D012834:Silver; C053503:ceftiofur; D014025:Titanium
Advanced oxidation process; Ceftiofur sodium; Photocatalytic mineralization; Plasmonic photocatalyst; Titania nanotubes