Effects of humic acid fractions with different polarities on photodegradation of 2,4-D in aqueous environments

2008, Volume 2, Issue 3

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Frontiers of Environmental Science & Engineering >> 2008, Volume 2, Issue 3 doi: 10.1007/s11783-008-0049-1

Effects of humic acid fractions with different polarities on photodegradation of 2,4-D in aqueous environments

Key Laboratory of Industrial Ecology and Environmental Engineering of Ministry of Education, School of Environmental and Biological Science and Technology, Dalian University of Technology;

Available online: 2008-09-05

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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 D possessed more 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 ?-? electron donor-acceptor interactions between the strong polar fractions and 2,4-D.

Keywords

polarity ; photodegradation ; different absorption ; UV-vis absorption ; FTIR

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