التفاصيل البيبلوغرافية
| العنوان: |
Photocatalytic oxidation of ceftiofur sodium under UV–visible irradiation using plasmonic porous Ag-TiO2 nanospheres. |
| المؤلفون: |
Pugazhenthiran, N., Murugesan, S., Valdés, H., Selvaraj, M., Sathishkumar, P., Smirniotis, P.G., Anandan, S., Mangalaraja, R.V. |
| المصدر: |
Journal of Industrial & Engineering Chemistry; Jan2022, Vol. 105, p384-392, 9p |
| مصطلحات موضوعية: |
PLASMONICS, TITANIUM dioxide, PHOTOCATALYSTS, PHOTOCATALYTIC oxidation, SODIUM, ELECTRON-hole recombination |
| مستخلص: |
Porous TiO 2 nanospheres decorated with plasmonic Ag nanoparticles effectively degrade ceftiofur sodium through UV–visible light activated •OH. Degradation products are not toxic. AgNPs enhances the charge separation at Ag/TiO 2 interface. [Display omitted] • Ag nanoparticles decorated porous TiO 2 nanospheres are synthesized solvothermally. • Ag NPs traps excited electron and forbids the e−/h+ recombination. • Amplified • OH formation causes rapid oxidation of ceftiofur sodium (CFS). • Under visible light, porous Ag-TiO 2 NSPs effectively oxidize CFS. • Oxidation products of CFS are not toxic. In this study, 250 nm sized porous anatase TiO 2 nanospheres (TiO 2 NSPs) composed of ∼ 10 nm sized anatase TiO 2 nanoparticles are obtained through a green synthetic route and their surfaces have been decorated with 3–4 nm sized plasmonic silver nanoparticles (AgNPs). Photoluminescence studies confirm that the AgNPs presence on TiO 2 NSPs surface effectively inhibits the radiative charge recombination and thus facilitates charge separation process at the Ag-TiO 2 NSPs interface, causing an enhanced photocatalytic activity. About 92% of the ceftiofur sodium (CFS) antibiotic taken initially is oxidized by Ag-TiO 2 NSPs upon 90 min white light irradiation, while Ag loaded Degussa P25 TiO 2 nanoparticles effects only 71% CFS oxidation. The synergistic effect given by plasmonic AgNPs and the continuous framework of anatase TiO 2 NPs contributes to inhibit the electron-hole recombination in the Ag-TiO 2 NSPs. Oxidation products of CFS in different water sources and their eco-toxicity effects identified through LC-MS and microtox-bioassays, respectively, indicate that the obtained oxidation products are non-toxic compared to pure CFS. Therefore, porous Ag-TiO 2 NSPs could be successfully applied in photocatalytic oxidation technologies, exploiting sunlight for the effective removal of pharmaceutical pollutants from wastewater. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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