DOIONLINE 
DOIONLINE Publish In |
International Journal of Advances in Science, Engineering and Technology(IJASEAT)-IJASEAT |
 Journal Home Volume Issue |
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Issue |
Volume-4,Issue-1, Spl. Iss-2 ( Feb, 2016 ) | |||||||||
Paper Title |
Enhanced Photocatalytic Properties Of Pure And Ln (La3+, Eu3+, Ce3+) – Modified Zno Powders Synthesized By Hydrothermal Method | |||||||||
Author Name |
Nina Kaneva, Assya Bojinova, Karolina Papazova, Dimitre Dimitrov, Alexander Eliyas Umar.Np.Pandey | |||||||||
Affilition |
Laboratory of Nanoparticle Science and Technology, Department of General and Inorganic Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia, 1164 Sofia, Bulgaria Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bldg. 11, Sofia 1113, Bulgaria | |||||||||
Pages |
187-190 | |||||||||
Abstract |
Simple and fast hydrothermal method is used to synthesize ZnO and Ln–doped (La3+, Eu3+, Ce3+) ZnO powders. Nanocrystalline photocatalysts with 2.0 mol% concentration are annealed at 100C for 1h. The pure and doped powders are characterized by X-ray diffraction, Scanning Electron Microscopy. The photocatalytic action of the mixtures is tested in photocatalytic oxidation of ethylene as model air pollutant (5000 ppm feed concentration) in gas-phase flat-plate continuous flow photocatalytic reactor at maximum ethylene contact time of 4 min and optimal relative humidity 30%. The powderform samples were suspended in water and after sonication (24 kHz) to disintegrate agglomerates the slurry is deposited by the capillary method on TLC sheets to obtain 1 mg/cm2 loading. The photoactivity testing was carried out using UV-A and UV-C illumination (0.014 W/cm2). Eu3+-modified ZnO is superior to pure ZnO. It gave the highest conversion degrees both under UV-A and UV-C illumination, whereupon the latter yielded superior performance. There is no activity under visible light illumination due to the wide band gap. Keywords— ZnO, Rare Earths, Powders, photocatalysis. | |||||||||
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