期刊
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
卷 14, 期 3, 页码 576-582出版社
SPRINGERNATURE
DOI: 10.1039/c4pp00262h
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资金
- Bogazici University [08Y101D]
The influence of photocatalytic degradation on molecular size fractionation (0.45 mu m 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 lambda(emis) = 450 nm to that at lambda(emis) = 500 nm, following the excitation at lambda(exc) = 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.
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