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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Ruwei Wang
  • Yufeng Zhu
  • Yongfu Qiu
  • Chi-Fai Leung
  • Jun He
  • Guijian Liu

Detail(s)

Original languageEnglish
Pages (from-to)123-130
Journal / PublicationChemical Engineering Journal
Volume226
Publication statusPublished - 5 Jun 2013

Abstract

The effects of KOH concentration (10-30M) on the morphology of KNbO3 produced from Nb2O5 by hydrothermal synthesis have been investigated. High purity KNbO3 nanocubes have been obtained using 30M 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 2.76eV 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. © 2013.

Research Area(s)

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

Citation Format(s)

Synthesis of nitrogen-doped KNbO3 nanocubes with high photocatalytic activity for water splitting and degradation of organic pollutants under visible light. / Wang, Ruwei; Zhu, Yufeng; Qiu, Yongfu; Leung, Chi-Fai; He, Jun; Liu, Guijian; Lau, Tai-Chu.

In: Chemical Engineering Journal, Vol. 226, 05.06.2013, p. 123-130.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review