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Open AccessArticle

Gold Nanoparticle-Decorated Bi2S3 Nanorods and Nanoflowers for Photocatalytic Wastewater Treatment

1
International Academy of Optoelectronics at Zhaoqing, South China Normal University, Liyuan Street, Zhaoqine 526238, China
2
ARC Centre of Excellence in Exciton Science, School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
3
Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Edward G. Gillan
Catalysts 2021, 11(3), 355; https://doi.org/10.3390/catal11030355
Received: 21 January 2021 / Revised: 4 March 2021 / Accepted: 5 March 2021 / Published: 9 March 2021
Colloidal synthesis of photocatalysts with potential to overcome the drawback of low photocatalytic efficiency brought by charge recombination and narrow photo-response has been a challenge. Herein, a general and facile colloidal approach to synthesize orthorhombic phase Bi2S3 particles with rod and flower-like morphology is reported. We elucidate the formation and growth process mechanisms of these synthesized nanocrystals in detail and cooperate these Bi2S3 particles with metallic gold nanoparticles (AuNPs) to construct heterostructured photocatalysts. The unique properties of AuNPs featuring tunable surface plasmon resonance and large field enhancement are used to sensitize the photocatalytic activity of the Bi2S3 semiconductor particles. The morphology, structure, elemental composition, and light absorption ability of the prepared catalysts are characterized by (high-resolution) transmission electron microscopy, scanning electron microscopy, X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy, and UV–vis absorption spectroscopy. The catalysts exhibit high and stable photocatalytic activity for the degradation of organic pollutants demonstrated using rhodamine B and methyl orange dyes under solar light irradiation. We show that the incorporation of the AuNPs with the Bi2S3 particles increases the photocatalytic activity 1.2 to 3-fold. Radical trapping analysis indicates that the production of hydroxyl and superoxide radicals are the dominant active species responsible for the photodegradation activity. The photocatalysts exhibit good stability and recyclability. View Full-Text
Keywords: Bi2S3; nanoflower; nanorod; photocatalysis; heterostructures; AuNPs Bi2S3; nanoflower; nanorod; photocatalysis; heterostructures; AuNPs
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MDPI and ACS Style

Nwaji, N.; Akinoglu, E.M.; Giersig, M. Gold Nanoparticle-Decorated Bi2S3 Nanorods and Nanoflowers for Photocatalytic Wastewater Treatment. Catalysts 2021, 11, 355. https://doi.org/10.3390/catal11030355

AMA Style

Nwaji N, Akinoglu EM, Giersig M. Gold Nanoparticle-Decorated Bi2S3 Nanorods and Nanoflowers for Photocatalytic Wastewater Treatment. Catalysts. 2021; 11(3):355. https://doi.org/10.3390/catal11030355

Chicago/Turabian Style

Nwaji, Njemuwa; Akinoglu, Eser M.; Giersig, Michael. 2021. "Gold Nanoparticle-Decorated Bi2S3 Nanorods and Nanoflowers for Photocatalytic Wastewater Treatment" Catalysts 11, no. 3: 355. https://doi.org/10.3390/catal11030355

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