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Open AccessArticle

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

Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Korea
Department of Materials Engineering, Keimyung University, Daegu 42403, Korea
Author to whom correspondence should be addressed.
Catalysts 2020, 10(10), 1188;
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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