The Role of Cocatalysts on Bismuth Vanadate in the Abatement of Endocrine Disrupting Chemicals and Related Compounds 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)

Detail(s)

Original languageEnglish
Article number1600300
Journal / PublicationParticle and Particle Systems Characterization
Volume34
Issue number4
Publication statusPublished - 1 Apr 2017

Abstract

Visible light photocatalysis is one of the technology pillars contributing to the future energy sustainability based on solar. Here, the the mechanistic roles of cocatalysts deposited on bismuth vanadate (BiVO4, bandgap 2.45 eV) in the photocatalytic degradation of endocrine disrupting chemicals and related compounds is reported. Because of its low conduction band edge potential, the photocatalytic activity of BiVO4 is limited by its ability to catalyze an otherwise efficient one-electron reduction of O2 (to form superoxide radical anion). As such, the deposition of cocatalysts is necessary to promote the alternative multielectron reduction of O2 in the following order: Pt > Pd > Ag. The general enhancement in activity is traced to the coupled effects of Schottky barrier-type charge separation (a function of the metal cocatalyst work function) and the catalytic surface electron transfer. Although the Pt and Pd deposits are more efficient in the former, the Ag is more active in cocatalyzing the surface charge transfer process. The optimum 2% Pt/BiVO4 shows high efficiencies in the visible light degradation of bisphenol A, thiodiphenol, and 2,4,6-trichlorophenol; moderate efficiencies toward bisphenol S, 4-chlorophenol and 2,4-dichlorophenol; and ineffective toward diphenyl sulfoxide and triclosan. The trend is related to the adsorption capacity of the substrates on the photocatalyst.

Research Area(s)

  • bismuth vanadate, cocatalysts, endocrine disrupting chemicals, visible light photocatalysis

Citation Format(s)

The Role of Cocatalysts on Bismuth Vanadate in the Abatement of Endocrine Disrupting Chemicals and Related Compounds under Visible Light. / Xu, Fei; Lv, Xincong; Kong, Dexin; Teoh, Wey Yang.

In: Particle and Particle Systems Characterization, Vol. 34, No. 4, 1600300, 01.04.2017.

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