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Enhanced self-catalytic degradation of CuEDTA in the presence of H2O2/UV: Evidence and importance of Cu-peroxide as a photo-active intermediate

Paper ID Volume ID Publish Year Pages File Format Full-Text
45166 46401 2016 6 PDF Available
Title
Enhanced self-catalytic degradation of CuEDTA in the presence of H2O2/UV: Evidence and importance of Cu-peroxide as a photo-active intermediate
Abstract

•A enhanced self-catalytic effect was observed for CuEDTA–H2O2/UV system.•CuO2 was found to be a favorable photo-active intermediate.•Photolysis of CuO2 could effectively speed up the transform of Cu(II)-to-Cu(I).

A new insight into the degradation of CuEDTA with UV/H2O2 was performed. It was found that the degradation was an UV-enhanced self-catalytic process with two main stages. The first was the induction stage in which cupric ions were produced in CuEDTA degradation with UV photolysis or/and H2O2 oxidation. The second was the photo-catalytic degradation stage in which CuEDTA was oxidized by UV-enhanced cupric ion-based Fenton process. The degradation efficiency reached as high as 82.2% during 18 min, being 37.4 times higher than the efficiency sum of single H2O2 oxidation and single UV photolysis. The enhancement effect can be contributed to the synergetic interaction between H2O2, cupric ion and UV, specially, to the excellent photo-activity of copper-peroxide intermediates. One of them was identified to be CuO2 by analysis of its CE-C4D electropherograms, UV–vis adsorption spectra, FT-IR spectra, Raman spectra, especially XPS spectra. The enhancement mechanism was experimentally confirmed to be due to the acceleration of Cu(II)-to-Cu(I) transform by the photolysis of copper-peroxide intermediates, leading to the increasing CuEDTA degradation.

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Keywords
CuEDTA; Self-catalysis; CuO2; Photo-active intermediate
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Enhanced self-catalytic degradation of CuEDTA in the presence of H2O2/UV: Evidence and importance of Cu-peroxide as a photo-active intermediate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 183, April 2016, Pages 371–376
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