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Lee, Changha
Advanced Redox Technology (ART) Lab
Research Interests
  • Water Treatment, Advanced Oxidation/Reduction, Water Chemistry, Environmental Catalyst

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Determination of quantum yields for the photolysis of Fe(III)-hydroxo complexes in aqueous solution using a novel kinetic method

Cited 17 times inthomson ciCited 15 times inthomson ci
Title
Determination of quantum yields for the photolysis of Fe(III)-hydroxo complexes in aqueous solution using a novel kinetic method
Author
Lee, ChanghaYoon, J
Keywords
Ferric-hydroxo complex; Hydroxyl radical; Photolysis; Quantum yield
Issue Date
2004-12
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CHEMOSPHERE, v.57, no.10, pp.1449 - 1458
Abstract
The determination of quantum yields for the photolysis of Fe(III)-hydroxo complexes is important for the quantitative investigation of hydroxyl radical ( .OH) production, not only in a natural water body, but also in the photo-Fenton process. A novel kinetic method, using a .OH probe compound, was established for the determination of the quantum yields in this study. The method was based on measuring the pseudo-first-order rate constant of the photodecomposition of dimethylsulfoxide (DMSO) in which DMSO and its primary products scavenged the .OH at an identical rate. The preliminary experiments for the photodecomposition kinetics supported the suitability of DMSOs as a probe compound for determining quantum yields. The individual quantum yields for the photolysis of the monomeric Fe(III) complexes, in the wavelength range 240-380 nm, were determined by the photodecomposition kinetics of the hydroxyl radical ( .OH) probe compound (DMSO). The determined values of the individual quantum yields were 0.046 ± 0.00052 for Fe 3+ (H 2O) 6 (hexaaquo ion) and 0.69 ± 0.025 for Fe(OH) 2+(H 2O) 5 (hydroxypentaaquo ion) at 254 nm, and showed decreasing values with increasing wavelength, in the ranges of 240-380 nm. The quantum yields between 240 and 280 nm were newly reported in this study, and the values obtained between 280 and 380 nm were in good agreement with the literature values.
URI
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DOI
10.1016/j.chemosphere.2004.07.052
ISSN
0045-6535
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