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Open AccessArticle

Photocatalytic Reactivity of Carbon–Nitrogen–Sulfur-Doped TiO2 Upconversion Phosphor Composites

1
Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Korea
2
Department of Materials Engineering, Keimyung University, Daegu 42403, Korea
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(10), 1188; https://doi.org/10.3390/catal10101188
Received: 14 September 2020 / Revised: 12 October 2020 / Accepted: 12 October 2020 / Published: 15 October 2020
(This article belongs to the Special Issue Heterogeneous Photocatalysis: A Solution for a Greener Earth)
Sol–gel synthesized N-doped and carbon–nitrogen–sulfur (CNS)-doped TiO2 solutions were deposited on upconversion phosphor using a dip coating method. Scanning electron microscopy (SEM) imaging showed that there was a change in the morphology of TiO2 coated on NaYF4:Yb,Er from spherical to nanorods caused by additional urea and thiourea doping reagents. Fourier transform infrared (FTIR) spectroscopy further verified the existence of nitrate–hyponitrite, carboxylate, and SO42− because of the doping effect. NaYF4:Yb,Er composites coated with N- and CNS-doped TiO2 exhibited a slight shift of UV-Vis spectra towards the visible light region. Photodecomposition of methylene blue (MB) was evaluated under 254 nm germicidal lamps and a 300 W Xe lamp with UV/Vis cut off filters. The photodegradation of toluene was evaluated on TiO2/NaYF4:Yb,Er and CNS-doped TiO2/NaYF4:Yb,Er samples under UV light illumination. The photocatalytic reactivity with CNS-doped TiO2/NaYF4:Yb,Er surpassed that of the undoped TiO2/NaYF4:Yb,Er for the MB solution and toluene. Photocatalytic activity is increased by CNS doping of TiO2, which improves light sensitization as a result of band gap narrowing due to impurity sites. View Full-Text
Keywords: CNS-doped TiO2; NaYF4:Yb,Er; upconversion phosphor; UV-Vis–NIR photocatalysis CNS-doped TiO2; NaYF4:Yb,Er; upconversion phosphor; UV-Vis–NIR photocatalysis
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MDPI and ACS Style

Eun, S.-R.; Mavengere, S.; Cho, B.; Kim, J.-S. Photocatalytic Reactivity of Carbon–Nitrogen–Sulfur-Doped TiO2 Upconversion Phosphor Composites. Catalysts 2020, 10, 1188.

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