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

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Applied Catalysis B

DOI:https://doi.org/10.1016/j.apcatb.2011.08.037· OSTI ID:1028167

Li, Yuan ^[1]; Wang, Wei ^[1]; Qiu, Xiaofeng ^[1]; Meyer, III, Harry M ^[1]; Paranthaman, Mariappan Parans ^[1]; Eres, Gyula ^[1]; Zhang, Zhenyu ^[1]; Gu, Baohua ^[1]

---

1. ORNL

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 10-2 min-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 detrimental to the photoreactivity, and all doping including N or Cr only and (Cr, N)-codoping were found to reduce photoreactivity.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program; Work for Others (WFO)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1028167
• Journal Information: Applied Catalysis B, Vol. 110, Issue 10; ISSN 0926-3373
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
ABSORPTION
IRRADIATION
METHYL ORANGE
METRICS
REACTION KINETICS
Titania
nanoclusters
cation-anion codoping
photodegradation
solar energy