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Improved photocatalytic and antibacterial activities of three-dimensional polycrystalline anatase TiO2 photocatalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40073 45843 2013 6 PDF Available
Title
Improved photocatalytic and antibacterial activities of three-dimensional polycrystalline anatase TiO2 photocatalysts
Abstract

•The 3D a-TiO2 was synthesized at low temperature by hydrothermal processing and ultrasound irradiation.•The ultrasound irradiation aids in crystallizing 3D a-TiO2 without thermal treatment.•The 3D a-TiO2 was composed of urchin-like structures that were assembled by rod-like polycrystals.•The photocatalytic and antibacterial activities of 3D a-TiO2 was found to be higher than that of P25.•Moreover, the 3D a-TiO2 exhibits excellent photocatalytic stability.

We report three-dimensional polycrystalline anatase TiO2 photocatalysts (3D a-TiO2) for environmental and bio-medical applications. The 3D a-TiO2 was synthesized without thermal treatment by the growth of rod-like polycrystals on Degussa P25 (P25) via low temperature hydrothermal processing and ultrasound irradiation. X-ray diffraction and high-resolution transmission electron microscopic results showed that the sea-urchin-like TiO2 structure consisted with anatase polycrystals. The photocatalytic degradation (reactive black 5 and rhodamine B solutions) rates of 3D a-TiO2 were found to be 2.2 times higher than that of P25. The recyclability of the 3D a-TiO2 was found to be high: the decolorization rate was 95% of the initial value after 15 cycles. In addition, 3D a-TiO2 exhibited excellent antibacterial activities for the sterilization of gram-negative Escherichia coli (E. coli) and gram-positive Staphylococcus aureus (S. aureus). Even at the 10th recycled use, more than 98% of E. coli and S. aureus can be killed. These results indicated that 3D a-TiO2 might have utility in several promising applications such as photocatalytic water/air purification and bactericidal agents.

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Keywords
TiO2; Hydrothermal treatment; Ultrasound irradiation; Bacterial deactivation; Dye degradation
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Improved photocatalytic and antibacterial activities of three-dimensional polycrystalline anatase TiO2 photocatalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 467, 2 October 2013, Pages 394–399
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