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Ternary TiO 2 /Fe 3 O 4 /CoWO 4 nanocomposites: Novel magnetic visible-light-driven photocatalysts with substantially enhanced activity through p-n heterojunction.
- Source :
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Journal of colloid and interface science [J Colloid Interface Sci] 2018 Aug 15; Vol. 524, pp. 325-336. Date of Electronic Publication: 2018 Apr 06. - Publication Year :
- 2018
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Abstract
- Herein, novel magnetic TiO <subscript>2</subscript> /Fe <subscript>3</subscript> O <subscript>4</subscript> /CoWO <subscript>4</subscript> nanocomposites were fabricated using a simple refluxing method followed by a calcination step at 450 °C. Photocatalytic activity of these nanocomposites were studied by decomposing rhodamine B, methyl orange, and fuchsine dye contaminants under visible-light illumination. Among the fabricated photocatalysts, the TiO <subscript>2</subscript> /Fe <subscript>3</subscript> O <subscript>4</subscript> /CoWO <subscript>4</subscript> (30%) photocatalyst exhibited superior activity. The degradation rate constant for rhodamine B by this ternary nanocomposite was 8.5 and 5.6 folds greater than those of the pure TiO <subscript>2</subscript> and TiO <subscript>2</subscript> /Fe <subscript>3</subscript> O <subscript>4</subscript> photocatalysts, respectively. Trapping experiments showed that superoxide anion radicals played critical role during the photocatalytic process. Visible-light harvesting due to the presence of CoWO <subscript>4</subscript> and effective suppression of the charge carriers from recombination due to formation of p-n heterojunction are the major parameters affecting the photocatalytic activity. Furthermore, the TiO <subscript>2</subscript> /Fe <subscript>3</subscript> O <subscript>4</subscript> /CoWO <subscript>4</subscript> (30%) photocatalyst displayed highly stable recycling performances. The present study provides a new strategy to design and fabricate magnetically recoverable photocatalysts based on TiO <subscript>2</subscript> with considerable activity under visible-light.<br /> (Copyright © 2018 Elsevier Inc. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1095-7103
- Volume :
- 524
- Database :
- MEDLINE
- Journal :
- Journal of colloid and interface science
- Publication Type :
- Academic Journal
- Accession number :
- 29656067
- Full Text :
- https://doi.org/10.1016/j.jcis.2018.03.069