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Photoluminescence of La/Ti mixed oxides prepared using sol–gel process and their pCBA photodecomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
28897 44104 2007 5 PDF Available
Title
Photoluminescence of La/Ti mixed oxides prepared using sol–gel process and their pCBA photodecomposition
Abstract

La/Ti mixed oxides with weight ratios of 1:9, 2:8, 3:7, and 4:6 were prepared by sol–gel method. The photocatalytic activity of La/Ti oxides was evaluated based on the pCBA photodecomposition. The catalyst samples were characterized by XRD, TEM, DRS, BET, and photoluminescence (PL) spectra. Particles of the La/Ti-mixed oxides showed the diameter of about 7 nm. We found that 30% doping of lanthanum ions on the TiO2 powders induced the highest pCBA (4-chlorobenzonic acid) photodecomposition in these experimental conditions. The order of its photoactivity was as following: 30 > 20 > 0 > 10 > 40 wt%, which was the same for PL tendency. Also, PL spectra intensity increased with calcination temperature from 500 to 600 °C, then decreased at 700 °C. Phtotcatalytic activity followed the trend of the PL spectra intensity. The modification of TiO2 surface by lanthanum ion made it possible to enhance the photoactivity by retarding the recombination of photoexcited electron/hole pairs, in the result of the higher photoactivity in the stronger PL intensity.

Keywords
TiO2; Photocatalysis; La doping; Photoluminescence; pCBA
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Photoluminescence of La/Ti mixed oxides prepared using sol–gel process and their pCBA photodecomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 185, Issues 2–3, 25 January 2007, Pages 156–160
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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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
Full-text PDF Download
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