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Enhancement of efficient Ag-S/TiO2 nanophotocatalyst for photocatalytic degradation under visible light

Feilizadeh, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1021/ie403720h
  3. Abstract:
  4. A new photocatalyst (Ag-S/PEG/TiO2) was synthesized by adding polyethylene glycol (PEG) to an efficient Ag-S/TiO2 photocatalyst, to obtain a photocatalyst that is highly active under visible light. In addition to Ag-S/PEG/TiO2, Ag-S/TiO2 and pure TiO2 were prepared to compare their properties and activities. Specifically, the morphologies and microstructures of the nanophotocatalysts were characterized by means of powder X-ray diffraction (XRD), N2 adsorption-desorption measurements, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) microanalysis, transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Moreover, to evaluate their activities, the synthesized powders were used for the degradation of acid orange 7 (AO7) and methylene blue (MB) azo dyes in aqueous solution under low-voltage light-emitting diodes (LEDs) as the visible-light source. It was found that addition of PEG to Ag-S/TiO2 increases the photodegradation of AO7 and MB by about 28.82% and 24.24%, respectively, in comparison with Ag-S/TiO2 without PEG addition
  5. Keywords:
  6. Aromatic compounds ; Azo dyes ; Dyes ; Fourier transform infrared spectroscopy ; Light emitting diodes ; Light sources ; Photoluminescence spectroscopy ; Scanning electron microscopy ; Transmission electron microscopy ; X ray diffraction ; X ray photoelectron spectroscopy ; Adsorption-desorption measurements ; Energy dispersive x-ray ; Methylene Blue ; Photo catalytic degradation ; Polyethylene glycol (PEG) ; Powder X ray diffraction ; Synthesized powder ; UV-visible diffuse reflectance spectroscopy ; Silver
  7. Source: Industrial and Engineering Chemistry Research ; Vol. 53, issue. 23 , 2014 , Pages 9578-9586 ; ISSN: 08885885
  8. URL: http://pubs.acs.org/doi/abs/10.1021/ie403720h