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Title: Investigation of the photoactivity of pristine and mixed phase N-doped titania under visible and solar irradiation

Nitrogen doped titania nano-particles were synthesized by sol–gel method with an aim to investigate the impact of doping in titanium matrix and the titania phases on their photocatalytic activity under visible and solar irradiation. The structural, optical and chemical characterization of the prepared materials were done using X-ray diffraction analysis, scanning electron microscopy, UV–visible diffuse reflectance spectroscopy, photoluminescence spectroscopy, and Fourier transform infrared spectroscopy. The samples were calcined at different temperatures (200 °C–600 °C) to obtain different phases. All the samples showed red-shift in the visible region attributable to the doping of nitrogen in the titania matrix. The samples calcined at low temperatures showed high photocatalytic activity compared to the high temperature samples. The enhancement in the visible light activity may be attributed to the large amount of nitrogen present in the surface region of the catalyst and reduced carrier recombination. Among the high temperature samples the high activity may be due to the presence of mixed phase as well. - Highlights: • Pristine and mixed phases of N doped titania synthesized at different temperatures. • High visible light photoactivity exhibited by pristine rutile phase and mixed phase. • Role of surface N in rutile and matrix embedded N inmore » other samples corroborated.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Solar and Energy Materials Laboratory, Department of Energy, Tezpur University, Tezpur, Assam 784028 (India)
  2. (India)
Publication Date:
OSTI Identifier:
22285085
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 83; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATALYSTS; DOPED MATERIALS; FOURIER TRANSFORM SPECTROMETERS; IRRADIATION; NITROGEN; PHOTOCATALYSIS; PHOTOLUMINESCENCE; RED SHIFT; RUTILE; SCANNING ELECTRON MICROSCOPY; SPECTROSCOPY; SURFACES; TITANIUM; TITANIUM OXIDES; X-RAY DIFFRACTION