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Preparation of Bi2S3/carbon quantum dot hybrid materials with enhanced photocatalytic properties under ultraviolet-, visible- and near infrared-irradiation

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Abstract

To solve the growing pollution issues, it is a promising alternative to develop efficient sunlight-driven photocatalysts for purifying organic wastewater. Herein, we report a new and efficient full-spectrum-responsive photocatalyst composed of Bi2S3 nanotubes incorporated with carbon quantum dots (C-dots) for rapidly degrading methylene blue (MB) and tetracycline hydrochloride (TC). Compared with naked Bi2S3 nanotubes, the as-prepared Bi2S3/C-dot nanohybrids show a remarkably higher photocatalytic efficiency for degrading MB or TC under ultraviolet (UV-), visible (vis-) and near-infrared (NIR-) light irradiation within 5 minutes. A possible mechanism is proposed for the enhanced photocatalytic activity of the Bi2S3/C-dot nanohybrids. A lower band gap as well as a wider absorbance in the UV-, vis- and NIR-regions can increase the light harvesting ability of the Bi2S3/C-dots. Meanwhile, the existence of C-dots can facilitate the charge separation of the photo-generated electron/hole pairs while electrons transfer from Bi2S3 to C-dots. Besides, an increased surface area of the Bi2S3/C-dot nanohybrids also contributes to the excellent photocatalytic activity.

Graphical abstract: Preparation of Bi2S3/carbon quantum dot hybrid materials with enhanced photocatalytic properties under ultraviolet-, visible- and near infrared-irradiation

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Publication details

The article was received on 25 Jun 2017, accepted on 13 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR04593J
Citation: Nanoscale, 2017, Advance Article
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    Preparation of Bi2S3/carbon quantum dot hybrid materials with enhanced photocatalytic properties under ultraviolet-, visible- and near infrared-irradiation

    J. Wang, X. Zhang, J. Wu, H. Chen, S. Sun, J. Bao, S. Li and H. Bi, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR04593J

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