fulltext.study @t Gmail

Preparation, characterization and application of Nd–TiO2 photocatalyst for the reduction of Cr(VI) under UV light illumination

Paper ID Volume ID Publish Year Pages File Format Full-Text
48647 46516 2007 9 PDF Available
Title
Preparation, characterization and application of Nd–TiO2 photocatalyst for the reduction of Cr(VI) under UV light illumination
Abstract

A novel photocatalyst, titanium dioxide (TiO2) doped with neodymium (Nd), was prepared by the sol–gel method and used for the photocatalytic reduction of Cr(VI) under UV illumination, in order to determine its photocatalytic properties. A series of Nd3+–TiO2 catalysts prepared with different Nd3+ dosages were characterized by XRD, Raman spectroscopy, SEM, EDX, TEM, EDS and XPS spectroscopy. In the experiments, formic acid was used as a hole scavenger to enhance the photocatalytic reduction reaction. The experiments demonstrated that Cr(VI) was effectively reduced in aqueous Nd3+–TiO2 suspension by more than 95% within 60 min, while the pH of the solution increased from 3.1 to 3.35 due to the consumption of formic acid. The experimental results indicate that the presence of Nd3+ in TiO2 catalysts substantially enhances the photocatalytic reaction of chromium(VI) reduction. It was found that the optimal dosage of 1–3 wt% Nd3+ in TiO2 achieved the fastest reaction of Cr(VI) reduction under the experimental conditions. The neodymium ions deposited on the TiO2 surface behave as sites at which electrons accumulate. The improved separation of electrons and holes on the modified TiO2 surface allows more efficient channeling of the charge carriers into useful reduction and oxidation reactions rather than recombination reactions. The presence of sacrificial electron donors such as formic acid enhances the photocatalytic reduction of Cr(VI). The Cr(VI) adsorbed on the surface of the TiO2 particles was observed to be almost completely photoreduced to Cr(III).

Keywords
Chromium(VI); Neodymium; Photocatalysis; Reduction; Titanium dioxide
First Page Preview
Preparation, characterization and application of Nd–TiO2 photocatalyst for the reduction of Cr(VI) under UV light illumination
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 77, Issues 1–2, 30 November 2007, Pages 157–165
Authors
, , , , , ,
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