N-Loaded TiO2 for Photocatalytic Degradation of Methyl Orange under Visible Light Irradiation

Natkritta Boonprakob; Natda Wetchakun; Sukon Phanichphant; Jun Chen; Burapat Inceesungvorn

doi:10.4028/www.scientific.net/AMR.622-623.883

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 622-623N-Loaded TiO2 for Photocatalytic Degradation of...

N-Loaded TiO₂ for Photocatalytic Degradation of Methyl Orange under Visible Light Irradiation

Abstract:

Nitrogen-loaded TiO₂ (N-loaded TiO₂), a visible-light driven catalyst, was successfully synthesized by the modified sol-gel method. Physical characterizations of the as-prepared catalysts have been performed by using X-ray diffraction (XRD), Diffuse reflectance UVvisspectroscopy(DRUVvis), Raman spectroscopyand BETspecific surface areain order to obtain structure-activity relationship. Results from Raman spectroscopy clearly suggested that N atoms were incorporated into the TiO₂ crystal lattice as evidenced by the vibrational peak of TiN in TiO_2-xN_x.DR UVvis results also suggested that the nitrogen dopant might be responsible for narrowing the TiO₂band gap energy, thus resulting in a shift towards the visiblelight region. Photocatalytic activity of N-loaded TiO₂ evaluated through the degradation of methyl orange (MO)under visible light irradiation (l> 400 nm) indicated that all N-loaded photocatalysts exhibited significantly higher activities than the unloaded TiO₂ and Degussa P25 TiO₂. According to the results from DR UV-vis, XRD and BET studies, the enhanced photoactivity observed from N-loaded samples might be due to a decrease in TiO₂ band gap energy and/or changes in chemical and physical properties of the materials upon loading with nitrogen.

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Periodical:

Advanced Materials Research (Volumes 622-623)

Pages:

883-888

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.622-623.883

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Online since:

December 2012

Authors:

Natkritta Boonprakob, Natda Wetchakun, Sukon Phanichphant, Jun Chen, Burapat Inceesungvorn

Keywords:

Degradation, Methyl Orange, Modified Sol-Gel, N-Loaded TiO₂, Photocatalyst

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