Two-dimensional bismuth oxybromide coupled with molybdenum disulphide for enhanced dye degradation using low power energy-saving light bulb

W. P. Cathie Lee, Fhu Hin Wong, Nicole K. Attenborough, Xin Ying Kong, Lling Lling Tan, S. Sumathi, Siang-Piao Chai

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In the present work, two-dimensional bismuth oxybromide (BiOBr) was synthesized and coupled with co-catalyst molybdenum disulphide (MoS2) via a simple hydrothermal process. The photoactivity of the resulting hybrid photocatalyst (MoS2/BiOBr) was evaluated under the irradiation of 15 W energy-saving light bulb at ambient condition using Reactive Black 5 (RB5) as model dye solution. The photo-degradation of RB5 by BiOBr loaded with 0.2 wt% MoS2 (MoBi-2) exhibited more than 1.4 and 5.0 folds of enhancement over pristine BiOBr and titanium dioxide (Degussa, P25), respectively. The increased photocatalytic performance was a result of an efficient migration of excited electrons from BiOBr to MoS2, prolonging the electron-hole pairs recombination rate. A possible charge transfer diagram of this hybrid composite photocatalyst, and the reaction mechanism for the photodegradation of RB5 were proposed.

Original languageEnglish
Pages (from-to)63-69
Number of pages7
JournalJournal of Environmental Management
Volume197
Early online date18 Mar 2017
DOIs
Publication statusPublished - 15 Jul 2017

Keywords

  • Bismuth oxybromide
  • Molybdenum disulphide
  • Photocatalysis
  • Semiconductor
  • Visible light

ASJC Scopus subject areas

  • Environmental Engineering
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

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