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Highly efficient bacteria inactivation and phenol degradation by visible light irradiated iodine doped TiO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
45999 46428 2013 8 PDF Available
Title
Highly efficient bacteria inactivation and phenol degradation by visible light irradiated iodine doped TiO2
Abstract

In this study visible light active iodine doped titanium dioxide samples prepared by sol–gel method were investigated. Photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray fluorescence spectroscopy (XFS), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and by Brunauer–Emmett–Teller (BET) surface area technique.Different iodine/titanium ratios (nI/nTi = 0.0–2.6) were applied during the synthesis and the optimum value was determined by phenol degradation under UV and VIS irradiations. The photocatalytic efficiency towards phenol degradation and the inactivation of Escherichia coli (E. coli) contaminated water under visible light illumination (conventional 24 W energy-saving compact fluorescence lamps) of the most active iodine-doped TiO2 (nI/nTi = 0.5; 79.5 m2/g; 98 wt% anatase) was compared with well known reference photocatalysts, that are Aeroxide P25 and Aldrich anatase (>85 nm primary crystallite size). Results showed that our iodine doped TiO2 was far more efficient at inactivating the E. coli and decomposing the phenol than Aeroxide P25. Electron spin resonance (ESR) measurements confirmed the formation of highly reactive OH radicals by the iodine doped titania under VIS irradiation. In contrast, singlet oxygen and superoxide radical ions were not detected. The performed experiments also proved that dissolved iodine was produced in very low concentrations (about 0.01–0.025 mg/L) from the irradiated titanium dioxide. The dissolved iodine could have some contribution to the phenol oxidation and the disinfection effects. This study demonstrated this property of iodine-doped titanias for the first time.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► TiO2-I decomposes phenol with much higher efficiency than P25 under VIS irradiation. ► TiO2-I kills E. coli more effectively than P25 under visible light. ► Iodine doped TiO2 can generate OH radical under VIS irradiation. ► Dissolved iodine was derived from the irradiated titanium dioxide.

Keywords
Photocatalysis; Iodine doped; Visible light; Disinfection; Escherichia coli; Titanium dioxide; Spin trapping
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Highly efficient bacteria inactivation and phenol degradation by visible light irradiated iodine doped TiO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 129, 17 January 2013, Pages 194–201
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