Comparing Cr, and N only doping with (Cr, N)-codoping for enhancing visible light reactivity of TiO2

Yuan Li; Wei Wang; Xiaofeng Qiu; Liang Song; Harry M. Meyer; M. Parans Paranthaman; Gyula Eres; Zhenyu Zhang; Baohua Gu

doi:10.1016/j.apcatb.2011.08.037

Comparing Cr, and N only doping with (Cr, N)-codoping for enhancing visible light reactivity of TiO₂

Yuan Li, Wei Wang, Xiaofeng Qiu, Liang Song, Harry M. Meyer, M. Parans Paranthaman, Gyula Eres, Zhenyu Zhang, Baohua Gu

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

The photoreactivity of titania (TiO₂) nanoclusters with varying levels of N or Cr-doping, or (Cr, N)-codoping, was systematically investigated using photodegradation of methyl orange in aqueous suspensions. The shifting of the TiO₂ absorption edge into the visible spectral region that is primarily attributable to band gap narrowing was found to be a reliable metric for estimating the photoreactivity of the doped nanoclusters. Compared to the weak response with undoped and N-doped TiO₂, Cr-doping and (Cr, N)-codoping were found to significantly enhance photodegradation of methyl orange under visible light. The initial reaction rates increase from about 0 to above 1.6×10^-2min^-1 when the doping concentration of Cr in TiO₂ increases from 0 to 5%. In stark contrast, under UV irradiation, doping is not only ineffective but also detrimental to the photoreactivity, and all doping including N or Cr only and (Cr, N)-codoping were found to reduce photoreactivity.

Original language	English
Pages (from-to)	148-153
Number of pages	6
Journal	Applied Catalysis B: Environmental
Volume	110
DOIs	https://doi.org/10.1016/j.apcatb.2011.08.037
State	Published - Nov 2 2011

Funding

This work was sponsored in part by the US Department of Energy (DOE) Office of Basic Energy Sciences, Materials Science and Engineering Division , and Laboratory Directed Research and Development (LDRD) Program of Oak Ridge National Laboratory (ORNL) , which is managed by UT-Battelle LLC for the U.S. DOE under contract No. DE-AC05-00OR22725. STEM measurement was conducted at ORNL Center for Nanophase Materials Sciences, which is sponsored by the Scientific User Facilities Division of DOE .

Keywords

Cation-anion codoping
Nanoclusters
Photodegradation
Solar energy
Titania

Access to Document

10.1016/j.apcatb.2011.08.037

Cite this

@article{a82573e13a3e430293d8765f9bc85136,

title = "Comparing Cr, and N only doping with (Cr, N)-codoping for enhancing visible light reactivity of TiO2",

abstract = "The photoreactivity of titania (TiO2) nanoclusters with varying levels of N or Cr-doping, or (Cr, N)-codoping, was systematically investigated using photodegradation of methyl orange in aqueous suspensions. The shifting of the TiO2 absorption edge into the visible spectral region that is primarily attributable to band gap narrowing was found to be a reliable metric for estimating the photoreactivity of the doped nanoclusters. Compared to the weak response with undoped and N-doped TiO2, Cr-doping and (Cr, N)-codoping were found to significantly enhance photodegradation of methyl orange under visible light. The initial reaction rates increase from about 0 to above 1.6×10-2min-1 when the doping concentration of Cr in TiO2 increases from 0 to 5%. In stark contrast, under UV irradiation, doping is not only ineffective but also detrimental to the photoreactivity, and all doping including N or Cr only and (Cr, N)-codoping were found to reduce photoreactivity.",

keywords = "Cation-anion codoping, Nanoclusters, Photodegradation, Solar energy, Titania",

author = "Yuan Li and Wei Wang and Xiaofeng Qiu and Liang Song and Meyer, {Harry M.} and Paranthaman, {M. Parans} and Gyula Eres and Zhenyu Zhang and Baohua Gu",

year = "2011",

month = nov,

day = "2",

doi = "10.1016/j.apcatb.2011.08.037",

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journal = "Applied Catalysis B: Environmental",

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T1 - Comparing Cr, and N only doping with (Cr, N)-codoping for enhancing visible light reactivity of TiO2

AU - Li, Yuan

AU - Wang, Wei

AU - Qiu, Xiaofeng

AU - Song, Liang

AU - Meyer, Harry M.

AU - Paranthaman, M. Parans

AU - Eres, Gyula

AU - Zhang, Zhenyu

AU - Gu, Baohua

PY - 2011/11/2

Y1 - 2011/11/2

N2 - The photoreactivity of titania (TiO2) nanoclusters with varying levels of N or Cr-doping, or (Cr, N)-codoping, was systematically investigated using photodegradation of methyl orange in aqueous suspensions. The shifting of the TiO2 absorption edge into the visible spectral region that is primarily attributable to band gap narrowing was found to be a reliable metric for estimating the photoreactivity of the doped nanoclusters. Compared to the weak response with undoped and N-doped TiO2, Cr-doping and (Cr, N)-codoping were found to significantly enhance photodegradation of methyl orange under visible light. The initial reaction rates increase from about 0 to above 1.6×10-2min-1 when the doping concentration of Cr in TiO2 increases from 0 to 5%. In stark contrast, under UV irradiation, doping is not only ineffective but also detrimental to the photoreactivity, and all doping including N or Cr only and (Cr, N)-codoping were found to reduce photoreactivity.

AB - The photoreactivity of titania (TiO2) nanoclusters with varying levels of N or Cr-doping, or (Cr, N)-codoping, was systematically investigated using photodegradation of methyl orange in aqueous suspensions. The shifting of the TiO2 absorption edge into the visible spectral region that is primarily attributable to band gap narrowing was found to be a reliable metric for estimating the photoreactivity of the doped nanoclusters. Compared to the weak response with undoped and N-doped TiO2, Cr-doping and (Cr, N)-codoping were found to significantly enhance photodegradation of methyl orange under visible light. The initial reaction rates increase from about 0 to above 1.6×10-2min-1 when the doping concentration of Cr in TiO2 increases from 0 to 5%. In stark contrast, under UV irradiation, doping is not only ineffective but also detrimental to the photoreactivity, and all doping including N or Cr only and (Cr, N)-codoping were found to reduce photoreactivity.

KW - Cation-anion codoping

KW - Nanoclusters

KW - Photodegradation

KW - Solar energy

KW - Titania

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