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Fe3+/Fe2+ cycling promoted by Ta3N5 under visible irradiation in Fenton degradation of organic pollutants
- Source :
-
Applied Catalysis B: Environmental . Sep2007, Vol. 75 Issue 3/4, p256-263. 8p. - Publication Year :
- 2007
-
Abstract
- Abstract: Ta3N5 was synthesized by nitridation of Ta2O5 under NH3 flow at 700°C. The catalyst was pure Ta3N5 according to X-ray diffraction (XRD), and was about 5nm in size with a BET specific surface area 52.8m2/g. When Ta3N5 was added to Fe3+/H2O2 solution (known as Fenton-like system), most Fe3+ were adsorbed on the Ta3N5 surface and could not react with H2O2 in the dark, which is different from the general Fenton reaction. Under visible light irradiation, adsorbed Fe3+ ions were reduced to Fe2+ rapidly and Fe2+ were reoxidized by H2O2 on the Ta3N5 surface, thus a fast Fe3+/Fe2+ cycling was established. Kinetics and ESR measurements supported this mechanism. The Ta3N5/Fe3+/H2O2 system could efficiently decompose H2O2 to generate hydroxyl radicals driven by visible light, which could accelerate significantly the degradation of organic molecules such as N,N-dimethylaniline (DMA), and 2,4-dichlorophenol (DCP). A mechanism was proposed for iron cycling on the basis of experimental results. [Copyright &y& Elsevier]
- Subjects :
- *TANTALUM
*IRRADIATION
*CATALYSTS
*CATALYSIS
Subjects
Details
- Language :
- English
- ISSN :
- 09263373
- Volume :
- 75
- Issue :
- 3/4
- Database :
- Academic Search Index
- Journal :
- Applied Catalysis B: Environmental
- Publication Type :
- Academic Journal
- Accession number :
- 26488097
- Full Text :
- https://doi.org/10.1016/j.apcatb.2007.04.019