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Preparation and characterization of magnetic TiO2 nanoparticles and their utilization for the degradation of emerging pollutants in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
47176 46462 2010 8 PDF Available
Title
Preparation and characterization of magnetic TiO2 nanoparticles and their utilization for the degradation of emerging pollutants in water
Abstract

Magnetic TiO2/Fe3O4 and TiO2/SiO2/Fe3O4 nanoparticles (NPs) were prepared by an ultrasonic-assisted sol–gel method using a commercial nanosized magnetic iron oxide as a support. Magnetic NPs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption (BET surface area) and SQUID magnetometer. Structure analyses indicated that TiO2/Fe3O4 NPs presented a core–shell structure with a TiO2 (anatase) coating wrapped around the magnetic iron oxide surface. TiO2/SiO2/Fe3O4 NPs showed a ternary structure with a core of Fe3O4, a SiO2 mesosphere and a TiO2 (anatase) crust. Both types of NPs exhibited magnetic properties with saturation magnetization about 40 emu/g and low remanent magnetization and coercivity. Stability of TiO2/SiO2/Fe3O4 NPs in an aqueous solution under UV illumination was better than that of TiO2/Fe3O4 NPs as the presence of the insulation SiO2 layer prevented photodissolution of iron. Both catalysts showed the ability to catalyze the photodegradation of acetaminophen and other four pharmaceutical and personal care products (PPCPs) (antipyrine, caffeine, metoprolol and bisphenol A) from an aqueous solution. In terms of catalytic activity the synthesized magnetic NPs were almost comparable to the commercial Degussa P25 TiO2 photocatalyst. In addition, the easily recoverable magnetic photocatalysts showed good reusability, especially in the case of TiO2/SiO2/Fe3O4 NPs.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Core–shell magnetic TiO2 NPs were synthesized by a simple sol–gel method. ▶ Magnetic TiO2 NPs photocatalysed the degradation of some PPCPs in water. ▶ Magnetic TiO2/SiO2/Fe3O4 showed good stability and reusability.

Keywords
Emerging pollutants; Magnetic nanoparticles; Photocatalysis; Water treatment
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Preparation and characterization of magnetic TiO2 nanoparticles and their utilization for the degradation of emerging pollutants in water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 100, Issues 1–2, 11 October 2010, Pages 338–345
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