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Fabrication of novel carbon quantum dots modified bismuth oxide (α-Bi2O3/C-dots): Material properties and catalytic applications

Sharma, Shelja; Mehta, S. K.; Ibhadon, A. O.; Kansal, S. K.

Authors

Shelja Sharma

S. K. Mehta

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Dr Alex Ibhadon A.O.Ibhadon@hull.ac.uk
Reader in Catalysis and Reactor Engineering

S. K. Kansal



Abstract

The present work reports the facile and the template free sonochemical synthesis of a novel catalyst, α-Bi2O3/C-dots, for the degradation of indigo carmine (IC) dye, its simulated dyebath effluent and levofloxacin under visible light catalysis. The compositional, structural, optical and morphological analysis of α-Bi2O3/C-dots was studied using analytical, spectroscopic and microscopic techniques. X-ray diffraction (XRD) results confirmed the presence of a monoclinic phase of α-Bi2O3in the nanocomposite and crystallite size of 28.75 nm. Photoluminescence (PL) and UV–vis diffuse reflectance spectra (UV-DRS) studies showed good optical properties and a band gap of 2.49 eV. The synthesized photocatalyst showed superior visible-light driven photocatalytic activity for the degradation of indigo carmine dye (86% dye degradation in 120 min) compared to pure α-Bi2O3(57%). α-Bi2O3/C-dots also exhibited 79% degradation of antibiotic drug levofloxacin within 120 min, under optimized conditions of pH, catalyst dose and initial dye concentration. Scavenger studies revealed that hydroxyl radicals and electrons played predominant roles in the photocatalytic degradation of IC dye. With respect to total organic carbon (TOC) analysis, 68.8% total organic carbon reduction of the IC dye (10 mg/L) was observed under the same experimental conditions. The catalytic efficiency of C-dots in the photocatalytic process is explained by proposing a degradation mechanism.

Journal Article Type Article
Publication Date Jan 1, 2019
Journal Journal of Colloid and Interface Science
Print ISSN 0021-9797
Electronic ISSN 1095-7103
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 533
Pages 227-237
APA6 Citation Sharma, S., Mehta, S. K., Ibhadon, A. O., & Kansal, S. K. (2019). Fabrication of novel carbon quantum dots modified bismuth oxide (α-Bi2O3/C-dots): Material properties and catalytic applications. Journal of colloid and interface science, 533, 227-237. https://doi.org/10.1016/j.jcis.2018.08.056
DOI https://doi.org/10.1016/j.jcis.2018.08.056
Publisher URL https://www.sciencedirect.com/science/article/abs/pii/S002197971830972X
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