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Yolk–shell structured Fe3O4@C@F-TiO2 microspheres with surface fluorinated as recyclable visible-light driven photocatalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
45959 46427 2014 8 PDF Available
Title
Yolk–shell structured Fe3O4@C@F-TiO2 microspheres with surface fluorinated as recyclable visible-light driven photocatalysts
Abstract

•A novel kind of yolk–shell structured Fe3O4@C@F-TiO2 microspheres were prepared by a template-based solvothermal etching method.•The degradation efficiency of Rhodamine-B over Fe3O4@C@F-TiO2 microspheres under visible-light irradiation was 6.33 times that for P25 TiO2.•The photocatalysts were highly reusable.

The uniform magnetic Fe3O4@C@fluorinated-TiO2 (Fe3O4@C@F-TiO2) microspheres with multilevel yolk–shell structures were successfully prepared by a simple and improved solvothermal method. The carbon mid-layer containing numerous hydrophilic groups induces TiO2 growth onto its surface and plays a crucial role in protecting Fe3O4 cores from excessive erosion and keeping the integrity of the hollow structure during the solvothermal etching process, meanwhile as an electron acceptor it can reduce electron–hole recombination rate. In the presence of HF, the obtained TiO2 shell possesses an enhanced crystallization resulting from the rapid in situ fluoride-mediated dissolution and recrystallization processes, and plenty of TiF groups are formed on TiO2 surface through the ligand replacement reaction between F− and hydroxyl group. Furthermore, Fe3O4 cores will be partly etched by HF leading to the yolk–shell structure of an increased surface area of 167.50 m2/g while Fe3O4@C@F-TiO2 microspheres still maintain excellent magnetic separability. Due to the efficient molecular transportation and adsorption, and the synergic effect of carbon modification and surface fluorination of TiO2, the Fe3O4@C@F-TiO2 microspheres have been demonstrated to possess superior visible-light driven photocatalytic activity in degradation of Rhodamine-B than commercial P25 TiO2 catalysts.

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Keywords
Yolk–shell structure; Surface fluorination; Magnetic microspheres; Visible-light; Photocatalytic activity
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Yolk–shell structured Fe3O4@C@F-TiO2 microspheres with surface fluorinated as recyclable visible-light driven photocatalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 150–151, 5 May 2014, Pages 515–522
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us