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Development of visible light sensitive titania photocatalysts by combined nitrogen and silver doping
Saliby, I.E.,Erdei, L.,Shon, H.K.,Kim, J.H. Korean Society of Industrial and Engineering Chemi 2011 Journal of industrial and engineering chemistry Vol.17 No.2
In this study we present the effects of non-metal (nitrogen) and metal/non-metal (silver/nitrogen) dopants on titanium dioxide (TiO<SUB>2</SUB>) in synthesising visible-light reactive photocatalysts. Nanopowders of TiO<SUB>2</SUB>-N and TiO<SUB>2</SUB>-N-Ag were synthesised using a simple procedure at room temperature. For nitrogen doping, a dispersion of Degussa P-25 was treated with ammonium hydroxide. The obtained modified catalyst was further treated with silver nitrate powder to facilitate silver-nitrogen co-doping. The produced catalysts were characterised using X-ray diffraction, X-ray photoelectron spectroscopy, and specific surface area measurements. Scanning electron microscopy/energy dispersive X-ray and transmission electron microscopy were adapted to detect changes in the morphology and in the chemical composition of synthesised catalysts. The results show that both the morphology and appearance of catalysts were modified to yield nanopowders of yellowish color and relatively high specific surface area. Methylene blue (MB) dye was used as a model aquatic contaminant in 23mg/L concentration to study the performance of these novel photocatalysts in an aerobic mixed batch reactor system under white light irradiation. Both nitrogen and nitrogen-silver co-doping lead to visible light sensitivity and the new catalysts showed remarkable activities in the decolorisation of MB.
Jin, B.M.,Erdei, S.,Ainger, F.W. 동의대학교 기초과학연구소 1999 基礎科學硏究論文集 Vol.9 No.1
The UV absorption edge YVO₄crystal with a slight yttrium excess grown by Czochralski(CZ) technique, after annealing in O₂ atmosphere, was compared with oxygen deficiency-free YVO₄ crystals grown by the top seeded solution growth(TSSG) technique. The measurements show that the TSSG crystal has higher transparency in near-UV than the CZ sample, demonstrating a better near-stoichiometric composition in the TSSG-YVO₄single crystal.
Development of visible light sensitive titania photocatalysts by combined nitrogen and silver doping
Ibrahim El Saliby,손호경,Laszlo Erdei,김종호 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.2
In this study we present the effects of non-metal (nitrogen) and metal/non-metal (silver/nitrogen)dopants on titanium dioxide (TiO2) in synthesising visible-light reactive photocatalysts. Nanopowders of TiO2-N and TiO2-N–Ag were synthesised using a simple procedure at room temperature. For nitrogen doping, a dispersion of Degussa P-25 was treated with ammonium hydroxide. The obtained modified catalyst was further treated with silver nitrate powder to facilitate silver-nitrogen co-doping. The produced catalysts were characterised using X-ray diffraction, X-ray photoelectron spectroscopy, and specific surface area measurements. Scanning electron microscopy/energy dispersive X-ray and transmission electron microscopy were adapted to detect changes in the morphology and in the chemical composition of synthesised catalysts. The results show that both the morphology and appearance of catalysts were modified to yield nanopowders of yellowish color and relatively high specific surface area. Methylene blue (MB) dye was used as a model aquatic contaminant in 23 mg/L concentration to study the performance of these novel photocatalysts in an aerobic mixed batch reactor system under white light irradiation. Both nitrogen and nitrogen-silver co-doping lead to visible light sensitivity and the new catalysts showed remarkable activities in the decolorisation of MB.
Lampert, M,Anda, G,Czopf, A,Erdei, G,Guszejnov, D,Ková,csik, ??,Pokol, G I,Ré,fy, D,Nam, Y U,Zoletnik, S American Institute of Physics 2015 Review of scientific instruments Vol.86 No.7
<P>A novel beam emission spectroscopy observation system was designed, built, and installed onto the Korea Superconducting Tokamak Advanced Research tokamak. The system is designed in a way to be capable of measuring beam emission either from a heating deuterium or from a diagnostic lithium beam. The two beams have somewhat complementary capabilities: edge density profile and turbulence measurement with the lithium beam and two dimensional turbulence measurement with the heating beam. Two detectors can be used in parallel: a CMOS camera provides overview of the scene and lithium beam light intensity distribution at maximum few hundred Hz frame rate, while a 4 ?? 16 pixel avalanche photo-diode (APD) camera gives 500 kHz bandwidth data from a 4 cm ?? 16 cm region. The optics use direct imaging through lenses and mirrors from the observation window to the detectors, thus avoid the use of costly and inflexible fiber guides. Remotely controlled mechanisms allow adjustment of the APD camera's measurement location on a shot-to-shot basis, while temperature stabilized filter holders provide selection of either the Doppler shifted deuterium alpha or lithium resonance line. The capabilities of the system are illustrated by measurements of basic plasma turbulence properties.</P>