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Photocatalytic degradation of azo dyes by nitrogen-doped TiO"2 nanocatalysts [An article from: Chemosphere]
Book Details
Author(s)Y. Liu, X. Chen, J. Li, C. Burda
PublisherElsevier
ISBN / ASINB000RR5I8A
ISBN-13978B000RR5I83
MarketplaceFrance 🇫🇷
Description
This digital document is a journal article from Chemosphere, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
This study examined the photocatalytic degradation of three azo dyes, acid orange 7 (AO7), procion red MX-5B (MX-5B) and reactive black 5 (RB5) using a new type of nitrogen-doped TiO"2 nanocrystals. These newly developed doped titania nanocatalysts demonstrated high reactivity under visible light (@l>390nm), allowing more efficient usage of solar light. The doped titania were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Experiments were conducted to compare the photocatalytic activities of nitrogen-doped TiO"2 nanocatalysts and commercially available Degussa P25 powder using both UV illumination and solar light. It is shown that nitrogen-doped TiO"2 after calcination had the highest photocatalytic activity among all three catalysts tested, with 95% of AO7 decolorized in 1h under UV illumination. The doped TiO"2 also exhibited substantial photocatalytic activity under direct sunlight irradiation, with 70% of the dye color removed in 1h and complete decolorization within 3h. Degussa P25 did not cause detectable dye decolorization under identical experimental conditions using solar light. The decrease of total organic carbon (TOC) and evolution of inorganic sulfate (SO"4^2^-) ions in dye solutions were measured to monitor the dye mineralization process.
Description:
This study examined the photocatalytic degradation of three azo dyes, acid orange 7 (AO7), procion red MX-5B (MX-5B) and reactive black 5 (RB5) using a new type of nitrogen-doped TiO"2 nanocrystals. These newly developed doped titania nanocatalysts demonstrated high reactivity under visible light (@l>390nm), allowing more efficient usage of solar light. The doped titania were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Experiments were conducted to compare the photocatalytic activities of nitrogen-doped TiO"2 nanocatalysts and commercially available Degussa P25 powder using both UV illumination and solar light. It is shown that nitrogen-doped TiO"2 after calcination had the highest photocatalytic activity among all three catalysts tested, with 95% of AO7 decolorized in 1h under UV illumination. The doped TiO"2 also exhibited substantial photocatalytic activity under direct sunlight irradiation, with 70% of the dye color removed in 1h and complete decolorization within 3h. Degussa P25 did not cause detectable dye decolorization under identical experimental conditions using solar light. The decrease of total organic carbon (TOC) and evolution of inorganic sulfate (SO"4^2^-) ions in dye solutions were measured to monitor the dye mineralization process.
