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Photocatalytic reduction of 4-nitrophenol with arginine-modified titanium dioxide nanoparticles

Paper ID Volume ID Publish Year Pages File Format Full-Text
48761 46521 2007 8 PDF Available
Title
Photocatalytic reduction of 4-nitrophenol with arginine-modified titanium dioxide nanoparticles
Abstract

The surface charge of titanium dioxide (TiO2) affects the adsorption rates of target molecules, thereby influencing the associated photocatalytic degradation rates of these molecules. This study describes the specific photocatalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with arginine-modified TiO2 (Arg–TiO2) nanoparticles. 4-AP was the only identifiable by-product detected by chromatographic analysis. The terminal amine groups of the arginine monolayer create a positive TiO2 surface charge over a wide range of pH values. At high pH, the degradation rate of 4-NP increased due to improved target adsorption. Furthermore, the presence of the arginine monolayer perturbs the degradation mechanism distribution of 4-NP away from indiscriminant oxidation toward selective reduction. Photocatalysis of a target molecule such as benzenesulfonic acid (BSA) showed that while electrostatic attraction of the target to the photocatalyst is important, the reduction potential of the target molecule dictates efficient degradation on Arg–TiO2.

Keywords
Photocatalysis; Nitrophenol; Surface-modified titanium dioxide
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Photocatalytic reduction of 4-nitrophenol with arginine-modified titanium dioxide nanoparticles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 74, Issues 1–2, 18 June 2007, Pages 103–110
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