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Photocatalytic removal of 2-nitrophenol using silver and sulfur co-doped TiO2 under natural solar light
Feilizadeh, M ; Sharif University of Technology | 2015
2092
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- Type of Document: Article
- DOI: 10.2166/wst.2015.180
- Publisher: IWA Publishing , 2015
- Abstract:
- To overcome the drawback of poor solar light utilization brought about by the narrow photoresponse range of TiO2, a silver and sulfur co-doped TiO2 was synthesized. Using the prepared catalyst, solar photocatalytic degradation of 2-nitrophenol (2-NP) by a TiO2-based catalyst was studied for the first time. Effects of the co-doping on the structural, optical and morphological properties of the synthesized nanoparticles were investigated by different characterization methods: X-ray diffraction, N2 adsorption-desorption measurements, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, UV-visible diffuse reflectance spectroscopy and Fourier transform infrared spectroscopy. Solar experiments showed that the co-doping with silver and sulfur significantly increased the photocatalytic activity. In various initial concentrations of 2-NP more than 99% of the contaminant was decomposed by Ag-S/TiO2 in less than 150 minutes, while the degradation efficiency was much less in the presence of bare TiO2. Kinetic studies suggested that solar photocatalytic degradation of 2-NP is consistent with the Langmuir-Hinshelwood model. The rate constant of the reaction and adsorption constant of the modified photocatalyst were found to be 2.4 and 4.1 times larger than that of bare TiO2, respectively
- Keywords:
- Ag-S/TiO2 ; Solar degradation ; Degradation ; Electron microscopy ; Energy dispersive spectroscopy ; Fourier transform infrared spectroscopy ; High resolution transmission electron microscopy ; Rate constants ; Scanning electron microscopy ; Synthesis (chemical) ; Transmission electron microscopy ; X ray diffraction ; X ray spectroscopy ; Co-doping ; Energy dispersive X ray spectroscopy ; Langmuir-Hinshelwood models ; Photocatalytic activities ; Solar photocatalytic degradation ; UV-visible diffuse reflectance spectroscopy ; Titanium dioxide ; 2-nitrophenol ; Water pollutant ; Adsorption ; Chemical reaction ; Concentration (composition) ; Oxide ; Phenolic compound ; Photodegradation ; ultraviolet radiation ; Comparative study ; Controlled study ; Crystal structure ; Heavy metal removal ; Light ; Photocatalysis ; Roentgen spectroscopy ; Solar radiation ; Surface area ; Catalysis ; Chemistry ; Coloring Agents ; Kinetics ; Nitrophenols ; Photolysis ; Silver ; Sulfur ; Sunlight ; Titanium ; Water Pollutants, Chemical
- Source: Water Science and Technology ; Volume 72, Issue 3 , 2015 , Pages 339-346 ; 02731223 (ISSN)
- URL: http://wst.iwaponline.com/content/72/3/339