International Journal of Advances in Science, Engineering and Technology(IJASEAT)
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Volume-7,Issue-3  ( Jul, 2019 )
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Submitted Papers : 80
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  Journal Paper

Paper Title
Enhanced Photocatalytic Properties Of Pure And Ln (La3+, Eu3+, Ce3+) – Modified Zno Powders Synthesized By Hydrothermal Method

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 100C 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.


Author - Nina Kaneva, Assya Bojinova, Karolina Papazova, Dimitre Dimitrov, Alexander Eliyas Umar.Np.Pandey

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| Published on 2016-03-23
   
   
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