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Preparation of TiO2/Bi2WO6 nanostructured heterojunctions on carbon fibers as weaveable visible-light photocatalyst/photoelectrode

Abstract

The prerequisite for the photocatalytic application is to develop efficient and recyclable visible-light photocatalyst/photoelectrode. Herein, we have designed and prepared TiO2/Bi2WO6 nanostructured heterojunctions on carbon fibers (CFs) as an effective and weaveable visible-light photocatalyst/photoelectrode. With CFs as the substrate, TiO2 nanorods (diameter: 200 nm and length: ~2 µm) are prepared on their surface by a dip-coating -hydrothermal method, and then in-situ growth of Bi2WO6 nanosheets (diameter: 350-500 nm and thickness: ~15 nm) is realized on the surface of TiO2 nanorods by another hydrothermal treatment. When CFs/TiO2/Bi2WO6 bundles (length: ~4 cm, weight: 0.15 g) is floated on the polluted water, it can degrade 100% Rhodamine B (RhB) after 80 min, 100% Acid Orange 7 (AO7) after 60 min, 95.1% Tetracycline Hydrochloride (TTCH) after 60 min and 90.5% 4-chlorophenol (4-CP) after 150 min of visible-light irradiation (λ > 400 nm), higher than those by pure CFs or CFs/TiO2 heterojunctions. Moreover, CFs/TiO2/Bi2WO6 bundles can be further weaved into a cloth (area: 4 × 4 cm2). With CFs/TiO2/Bi2WO6 cloth as the working electrode, it has obvious photocurrent which can be enhanced by elevating the applied voltage bias. 100% RhB can be degraded by CFs/TiO2/Bi2WO6 cloth in 80 min via photoelectrocatalytic process (bias: 0.5V vs. SCE), higher than that from the photocatalysis (90.1% RhB) or electrocatalysis (21% RhB) process alone. More importantly, macroscale CFs/TiO2/Bi2WO6 cloth can be easily recycled and has good stability. Therefore, CFs/TiO2/Bi2WO6 cloth can be used as the efficient and recyclable visible-light photocatalyst/photoelectrode, with great potential in the practical applications for purifying the wastewater in river and/or lake.

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Publication details

The article was received on 07 Sep 2017, accepted on 05 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7EN00822H
Citation: Environ. Sci.: Nano, 2017, Accepted Manuscript
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    Preparation of TiO2/Bi2WO6 nanostructured heterojunctions on carbon fibers as weaveable visible-light photocatalyst/photoelectrode

    P. Xu, X. Shen, L. Luo, Z. Shi, Z. Liu, Z. Chen, M. Zhu and L. Zhang, Environ. Sci.: Nano, 2017, Accepted Manuscript , DOI: 10.1039/C7EN00822H

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