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The role of copper(II) ions in the photocatalytic oxidation of 1,4-dioxane

✍ Scribed by S.W. Lam; M. Hermawan; H.M. Coleman; K. Fisher; R. Amal

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
846 KB
Volume
278
Category
Article
ISSN
1381-1169

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✦ Synopsis

The effect of Cu 2+ on the photocatalytic oxidation of 1,4-dioxane was evaluated. The addition of Cu 2+ led to an enhancing effect in the photocatalytic degradation and mineralisation of 1,4-dioxane for both pH 3 and 5. This positive role of Cu 2+ was attributed to its involvement in the ligand-to-metal charge transfer (LMCT) process, where Cu 2+ formed complexes with 1,4-dioxane and/or its intermediate products, providing an alternative routes for the oxidation reaction via photoredox mechanism. The supporting evidence to the complexes formation has been confirmed using an electron spin resonance (ESR) spectroscopy and the semi-empirical PM3 calculation.

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## Abstract Kinetics and mechanism of oxidation of β‐alanine by peroxomonosulfate (PMS) in the presence of Cu(II) ion at pH 4.2 (acetic acid/sodium acetate) has been studied. Autocatalysis was observed only in the presence of copper(II) ion, and this was explained due to the formation of hydroperox