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Visible light photocatalysis on praseodymium(III)-nitrate-modified TiO2 prepared by an ultrasound method

Paper ID Volume ID Publish Year Pages File Format Full-Text
48393 46505 2008 8 PDF Available
Title
Visible light photocatalysis on praseodymium(III)-nitrate-modified TiO2 prepared by an ultrasound method
Abstract

Nanocrystalline TiO2 incorporated with praseodymium(III) nitrate has been prepared by an ultrasound method in a sol–gel process. The prepared sample is characterized by X-ray diffraction (XRD), nitrogen adsorption (BET surface area), UV–vis diffuse reflectance spectroscopy (UV–Vis DRS) and X-ray photoelectron spectroscopy (XPS). The prepared material consists of TiO2 nanocrystalline with 5 nm size incorporated with highly dispersed Pr(NO3)3. Visible light absorptions at 444, 469, 482 and 590 nm are observed in the prepared sample. These bands are attributed to the 4f transitions 3H4 → 3P2, 3H4 → 3P1, 3H4 → 3P0 and 3H4 → 1D2 of praseodymium(III) ions, respectively. This sample Pr(NO3)3-TiO2, as a novel visible light photocatalyst, shows high activity and stability in the decomposing rhodamine-B (RhB) and 4-chlorophenol (4-CP) under visible light irradiation. Results examined by electron spin resonance spectroscopy (ESR) reveal that the irradiation (>420 nm) of the photocatalyst dispersed in RhB aqueous solution induces the generation of highly active hydroxyl radicals (OH), leading to the cleavage of the whole conjugated chromophore structure of RhB. A mechanism based on local excitation of praseodymium(III) nitrate chromophore and interfacial charge transfer from the chromophore to TiO2 is proposed to explain the formation of active hydroxyl radicals in the photocatalytic system under visible light irradiation.

Keywords
Visible light photocatalysis; Titania; Praseodymium nitrate; Ultrasound preparation
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Visible light photocatalysis on praseodymium(III)-nitrate-modified TiO2 prepared by an ultrasound method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 77, Issues 3–4, 10 January 2008, Pages 264–271
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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