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Nanocrystalline titania xerogels doped by metal precursors in the photocatalytic degradation of 2,4-D sodium salts

Paper ID Volume ID Publish Year Pages File Format Full-Text
26123 43935 2015 10 PDF Available
Title
Nanocrystalline titania xerogels doped by metal precursors in the photocatalytic degradation of 2,4-D sodium salts
Abstract

•Heterodoped titania xerogels show improved photocatalytic activity.•Heterodoped titania xerogels show rectification phenomena.•The effect of co-doping increased the stability and the photocatalytic activity of TiO2.•Novel photocatalysts for Advanced Oxidation Processes were optimized.

(2,4-Dichlorophenoxy) acetic acid (2,4-D) sodium salt can disrupt the endocrine system in both humans and animals. Its removal from wastewaters by photocatalysis has been extensively studied using TiO2 semiconductors, and more recently metal-doped TiO2 to enhance its photocatalytic activity. Co-doping with various ions, on the other hand, has been scarcely studied, even though it might facilitate band alignment among the relevant junctions, decreasing the abundance of sensitizing states behaving like traps, and thus leading to the improvement on photocatalytic performance. In this work, the photocatalytic (365–460 nm) degradation of 2,4-D sodium salt was carried out at various pH and temperatures, using transition metal doped-TiO2 obtained as xerogels. Co-doping with Cu–Fe, Cu–Zn, and Cu–Zn–Fe, indicated a relevant role of Cu due to its tendency to oxide formation, control of crystal size (i.e., band alignment), and removal of trap states, giving the best activity for Fe2O3–CuO–TiO2 at pH 11. A switch from a dual adsorption mechanism reported for undoped-TiO2 samples to one dominated by solution hydroxyl radicals is also evident in the doped-xerogels.

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Keywords
Metal oxides doped TiO2; 2,4-D sodium salt
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Nanocrystalline titania xerogels doped by metal precursors in the photocatalytic degradation of 2,4-D sodium salts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 311, 1 October 2015, Pages 166–175
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