Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 607, Issue -, Pages 269-280Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.08.167
Keywords
Bi2WO6; In situ construction; Homojunction; Phase transformation; Bismuth inducement
Categories
Funding
- LiaoNing Revitalization Talents Program [XLYC1907173]
- Science and Technology General Pro-ject of Liaoning Provincial Education Department [LQ2019003, LQ2020014, LJ2020014]
- Open Fund of State Environmental Protection Key Laboratory of Coastal Ecosystem [202103]
- Open Fund of Institute of Ocean Research [BDHYYJY2021006, BDHYYJY2020014]
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The high photocatalytic efficiency tetragonal/orthorhombic-bismuth tungstate (t/o-Bi2WO6) homojunctions were fabricated through a novel Bi induced phase transformation method. The homojunction catalyst enhances separation and utilization efficiency of charge carriers, greatly boosting the catalytic efficiency, and proving to be stable over multiple cycles of operation.
Tetragonal/orthorhombic-bismuth tungstate (t/o-Bi2WO6) homojunctions of high photocatalytic efficiencies were fabricated through a novel in situ Bi induced phase transformation. The photocatalytic efficiencies of t-Bi2WO6 were greatly enhanced via formation of the homojunction. Photocatalytic degradation of rhodamine B (RhB), a recalcitrant organic pollutant, under simulated sunlight illumination was investigated as a demonstration for the efficiency enhancement. A 6.22 folds improvement was achieved with formation of the homojunction in terms of reaction rate constants. The homojunction catalyst was demonstrated to be photocatalytically stable over a five cycles operation. The t/o-Bi2WO6 homojunction enhances separation and utilization efficiency of photo-generated charge carriers and thus greatly boosts the catalytic efficiency. Trapping tests and electron spin resonance spectroscopy were conducted to reveal that singlet oxygen (O-1(2)), hole (h(+)), electrons (e(-)), and superoxide anion radical (center dot O-2(-)) are the main working reactive species for RhB degradation. Density functional theory (DFT) calculations were performed to prove the feasibility of Bi induced phase transformation of t-Bi2WO6 to o-Bi2WO6. The present development offers a new design route for high efficiency photocatalysts for water pollution control. (c) 2021 Elsevier Inc. All rights reserved.
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