Enhanced visible light photocatalytic performance of SnO2 nanoparticle co-doped with (Co, Nb) for organic dye degradation

Jayapandi, S and Premkumar, S and Ramakrishnan, V and Lakshmi, D and Shanavas, S and Acevedo, R and Anitha, K (2020) Enhanced visible light photocatalytic performance of SnO2 nanoparticle co-doped with (Co, Nb) for organic dye degradation. In: Journal of Materials Science: Materials in Electronics, 31 (13). pp. 10689-10701.

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Abstract

Fast electron–hole recombination rate, lower free radical generation, unsuitable valence band maximum (VBM) and conduction band minimum (CBM) position of SnO2 nanoparticle are the shortfalls in achieving a superior photocatalytic performance of organic dye degradation under sunlight irradiation. To rise above these margins, for the first time, the co-doping approach was attempted by a simple co-precipitation technique in which both cobalt (Co) and niobium (Nb) were doped in SnO2 nanoparticle. In this regard, pure, mono-doped 5 M Co, 5 M Nb and different concentrations of (Co, Nb) co-doped SnO2 nanoparticles were prepared and characterized through XRD, UV–Vis, PL, XPS, SEM, and cyclic voltammetry analyses. Moreover, the influence of crystalline nature, bond order, bandgap, electron–hole recombination rate, and VBM and CBM potential to the efficient photocatalytic activity have been discussed. The observed UV–Vis, PL, and cyclic voltammetry measurements revealed that the (Co, Nb) co-doped SnO2 nanoparticles have suitable CBM to meet better reduction capacity, lower electron–hole recombination rates, and higher stability than pure and mono-doped system. XPS analysis confirmed the presence of both Co and Nb in the SnO2 matrix and O1s spectrum revealed the presence of hydroxyl radical on its surface. Also, the terephthalic (TA) acid test showed that, at higher concentration of cobalt co-doped SnO2 nanoparticles, it generated maximum hydroxyl (OH·) radicals than that of others. Consequently, those nanoparticles exhibited 99 efficiency of methylene blue (MB) dye degradation at 30 min under direct sunlight atmosphere. For better photocatalytic outsight, the photodegradation mechanism was also proposed. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

Item Type:	Journal Article
Publication:	Journal of Materials Science: Materials in Electronics
Publisher:	Springer
Additional Information:	Copy right for this article belongs to Springer
Keywords:	Aromatic compounds; Cobalt; Cyclic voltammetry; Free radicals; Nanoparticles; Niobium; X ray photoelectron spectroscopy, Conduction-band minimum; Crystalline nature; Free radical generation; Hole recombination; Photocatalytic performance; Sunlight irradiation; Valence-band maximums; Voltammetry measurements, Photocatalytic activity
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	28 Oct 2020 06:45
Last Modified:	28 Oct 2020 06:45
URI:	http://eprints.iisc.ac.in/id/eprint/65657

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