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Phosphorus-doped titania nanotubes with enhanced photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
26676 43970 2011 7 PDF Available
Title
Phosphorus-doped titania nanotubes with enhanced photocatalytic activity
Abstract

Titania nanostructures have gained much attention lately due to their high specific surface area, ion-exchange ability, and better electrical properties. In this study, pure titania nanotubes (TNTs) were synthesized using hydrothermal method. Phosphorus-doped titania nanotubes (P-TNTs) were fabricated following a wet chemical procedure with dimethyl phosphite as a precursor. Characterization of the prepared pure/phosphorus-doped titania nanotubes was performed using transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), XRD analysis, UV–Vis absorption spectra, and BET specific surface area analysis. Phosphorus-doping slightly reduces the surface area but shifts the band gap towards the visible light region. When compared to pure TNTs, the optimal 0.75 wt.% P-TNTs have a similar surface area (272 m2/g vs. 274 m2/g) but with a band gap shift of 0.27 eV towards the visible light region. The photocatalytic activity of 0.75 wt.% P-TNTs was tested using rhodamine B (RhB) as a model pollutant under a 9 W fluorescent lamp and was significantly better than the benchmark Degussa P25 nanoparticles due to the band gap narrowing and an increased surface area. The decolorization follows first-order kinetics with the apparent rate constant k1 of 0.13 min−1 for 0.75 wt.% P-TNT and 0.07 min−1 for Degussa P25.

► Titania nanotubes (TNTs) and phosphorus-doped TNTs have a high specific surface area. ► As a result of phosphorus doping the band gap decreases from 3.22 eV (TNTs) to 2.95 eV. ► Phosphorus doping induce a discernable shift in the absorption edge towards the visible-light region. ► P-TNTs (0.75 wt.% P) have the highest photocatalytic activity.

Keywords
Nanotubes; Titania; Photocatalysis; Phosphorus doping; Band gap; Rhodamine B
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 225, Issue 1, 1 December 2011, Pages 81–87
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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