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Nitrogen-doped titanium oxide microrods decorated with titanium oxide nanosheets for visible light photocatalysis

Published online by Cambridge University Press:  31 January 2011

Jum Suk Jang ,
Eun Sun Kim ,
Hyun Gyu Kim ,
Sang Min Ji ,
Youngkwon Kim  and
Jae Sung Lee
Eun Sun Kim
Affiliation:
Eco-friendly Catalyst and Energy Laboratory (NRL), Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Hyojadong, Pohang 790-784, Korea
Hyun Gyu Kim
Affiliation:
Busan Center, Korea Basic Science Institute (KBSI), Busan 609-735, Korea
Jae Sung Lee*
Affiliation:
Eco-friendly Catalyst and Energy Laboratory (NRL), Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Hyojadong, Pohang 790-784, Korea
*
a)Address all correspondence to this author. e-mail: jlee@postech.ac.kr
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Abstract

Nitrogen-doped titania with a unique two-level hierarchical structure and visible light photocatalytic activity is reported. Thus, nitrogen-doped titanium oxide microrods decorated with N-doped titanium oxide nanosheets were synthesized by a hydrothermal reaction in NH4OH and postcalcination. During the calcination, the in situ incorporation of nitrogen atoms of ammonium ion into titania lattice was accompanied by the structural evolution from titanate to anatase titania. The morphological and structural evolution was monitored by scanning electron microscopy (SEM), x-ray diffraction (XRD), thermogravimetric analysis/differential thermal analysis (TGA/DTA), Raman, Fourier transform infrared (FTIR), x-ray absorption near edge structure (XANES), x-ray photoelectron spectroscopy (XPS), and adsorption isotherms. The N-doping brought visible light absorption, and the material exhibited high photocatalytic activity in the decomposition of Orange II under visible light irradiation (λ ≥ 400 nm), especially when it was loaded with 1 wt% Pt as a cocatalyst.

Keywords

Environmentally protectiveHydrothermalPhotochemical

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Type
Articles
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Journal of Materials Research , Volume 25 , Issue 6 , June 2010 , pp. 1096 - 1104
Copyright
Copyright © Materials Research Society 2010

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