Synthesis of nitrogen-doped KNbO₃ nanocubes with high photocatalytic activity for water splitting and degradation of organic pollutants under visible light

Ruwei WANG, Yufeng ZHU, Yongfu QIU, Chi Fai LEUNG, Jun HE, Guijian LIU, Tai-Chu LAU

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63 Citations (Scopus)

Abstract

The effects of KOH concentration (10–30 M) on the morphology of KNbO₃ produced from Nb₂O₅ by hydrothermal synthesis have been investigated. High purity KNbO₃ nanocubes have been obtained using 30 M KOH at 200 °C. The KNbO₃ nanocubes can be readily doped with nitrogen by heating with urea at 425 °C without significant change in morphology. The band gap of KNbO₃ decreases from 3.13 to 2.76 eV as a result of N-doping, the surface area also increases substantially. The photocatalytic activity of the N-doped KNbO₃ nanocubes has been evaluated by photodegradation of four organic contaminants (rhodamine B, orange G, bisphenol A and pentachlorophenol) as well as water splitting under visible light irradiation. The results show that the photocatalytic activity of N-doped KNbO₃ is significantly higher than that of pure KNbO₃ nanocubes and Degussa TiO₂ P25 under visible light irradiation. Copyright © 2013 Published by Elsevier B.V.
Original languageEnglish
Pages (from-to)123-130
JournalChemical Engineering Journal
Volume226
Early online dateApr 2013
DOIs
Publication statusPublished - Jun 2013

Citation

Wang, R. W., Zhu, Y. F., Qiu, Y. F., Leung, C.-F., He, J., Liu, G. J., & Lau, T.-C. (2013). Synthesis of nitrogen-doped KNbO3 nanocubes with high photocatalytic activity for water splitting and degradation of organic pollutants under visible light. Chemical Engineering Journal, 226, 123-130.

Keywords

  • Niobium oxide
  • Nitrogen doping
  • Photodegradation
  • Organic pollutants
  • Water splitting

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