Effects of humic acid fractions with different polarities on photodegradation of 2, 4-D in aqueous environments |
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| Authors: | Chunyan YU Xie QUAN Xiaoxia OU Shuo CHEN |
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| Institution: | (1) Key Laboratory of Industrial Ecology and Environmental Engineering of Ministry of Education, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian, 116024, China |
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| Abstract: | Four fractions (A, B, C, and D) of humic acids (HAs) were separated based on the polarity from weak to strong. UV-vis absorption
and Fourier transform infrared spectroscopy (FTIR) analysis show that the fractions C and Dpossessedmore aromatic C=C content.
The influences of HAs and their fractions on the photolysis were investigated by the photodegradation of 2,4-D solutions under
simulated solar light irradiation. The degradation rate of 2,4-D was found to decrease in the presence of bulk HAs or their
fractions especially at high HAs concentration. The fractions of strong polarity C and D retarded the degradation rate more
than the fractions of weak polarity A and B. This could be attributed to the different absorption intensity of the four HAs
fractions in the order of D ⩾ C > A > B, and the stronger π-π electron donor-acceptor interactions between the strong polar
fractions and 2,4-D. |
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| Keywords: | humic acids (HAs) fractions 2 4-dichlorophenoxyacetic acid (2 4-D) photodegradation |
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