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Issue 3, 2015
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The effect of photocatalytic oxidation on molecular size distribution profiles of humic acid

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Abstract

The influence of photocatalytic degradation on molecular size fractionation (0.45 μm filtered, 100 kDa, 30 kDa and 3 kDa) of humic acid as a model compound of natural organic matter was investigated. The results were evaluated using UV-vis parameters, dissolved organic carbon (DOC) and excitation emission matrix (EEM) fluorescence spectral features. EEM fluorescence signatures displayed an irradiation period dependent transformation of humic-like fluorophores to fulvic-like fluorophores in accordance with the photocatalytic mineralization of HA. Molecular size distribution profiles expressed the formation of lower molecular size (<3 kDa) fractions through oxidative degradation of humic acid of higher molecular size fractions (100 kDa and 30 kDa fractions). The fluorescence-derived index (fluorescence intensity (FI), represented by the ratio of the emission intensity at λemis = 450 nm to that at λemis = 500 nm, following the excitation at λexc = 370 nm) was also investigated. The use of EEM features has proven to be a useful tool for monitoring the effect of photocatalytic degradation on the structure and molecular size distribution profile of HA.

Graphical abstract: The effect of photocatalytic oxidation on molecular size distribution profiles of humic acid

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Article information


Submitted
12 Jul 2014
Accepted
27 Oct 2014
First published
28 Oct 2014

Photochem. Photobiol. Sci., 2015,14, 576-582
Article type
Paper

The effect of photocatalytic oxidation on molecular size distribution profiles of humic acid

M. Bekbolet and S. Sen-Kavurmaci, Photochem. Photobiol. Sci., 2015, 14, 576
DOI: 10.1039/C4PP00262H

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