Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 556, Issue -, Pages 335-344Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.08.077
Keywords
WO3/Bi2MoO6; Heterojunction; Electrospinning; Visible-light photocatalysis
Categories
Funding
- Fundamental Research Funds for Zhejiang Provincial Universities and Research Institutes [2019JZ00009]
- National Natural Science Foundation of China [51708504, 51602049]
- Public Projects of Zhejiang Province [LGN18E080003]
- Science and Technology Project of Zhoushan [2017C41006]
- China Postdoctoral Science Foundation [2017M610217, 2018T110322]
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Visible-light-driven (VLD) heterojunction photocatalysts for refractory contaminant degradation have aroused huge interest because of their outstanding photocatalytic performance. From the aspect of practical application, it is important to develop a highly efficient, durable, eco-friendly and inexpensive VLD photocatalyst. Herein, we report a novel VLD WO3/Bi2MoO6 heterojunction photocatalyst with remarkable photocatalytic activity, which was fabricated via an electrospinning-calcination-solvothermal route. The phase, composition, morphologies, and optical properties of WO3/Bi2MoO6 heterojunctions were comprehensively characterized. The photocatalytic performance of WO3/Bi2MoO6 heterojunctions was assessed by the removal of rhodamine (RhB) and tetracycline hydrochloride (TC) under visible light (VL). WO3/Bi2MoO6 heterojunctions displayed superior photocatalytic activities compared to Bi2MoO6, WO3, or the mechanical mixture of WO3 and Bi2MoO6. In particular, the heterojunction material (0.4WB, theoretical molar ratio of WO3/Bi2MoO6 is 0.4/1.0) exhibited the best degradation efficiency (100%) and mineralization rate (52.3%) in 90 min, both of which exceeded the observed rates for Bi2MoO6 by 5.3 and 6.4 times, respectively. Moreover, 0.4WB showed a good durability in eight runs. The optimized photocatalytic property of WO3/Bi2MoO6 can be attributed to enhanced VL absorption and reduced recombination efficiency of carriers owing to the synergistic effects between Bi2MoO6 and WO3. The necessity of direct contact between WO3/Bi2MoO6 and contaminants was experimentally verified. The study on photocatalytic mechanism demonstrates that superoxide free radicals (O-2(center dot-)) and photo-generated hole (h(+)) are dominantly responsible for the pollutant degradation, as demonstrated by the trapping experiments and electron spin resonance (ESR) analysis. Therefore, the WO3/Bi2MoO6 heterojunction holds huge potential to be utilized as a durable and highly active photocatalyst for wastewater treatment. (C) 2019 Elsevier Inc. All rights reserved.
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