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

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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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Authors and Affiliations

  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

    Chunyan Yu, Xie Quan, Xiaoxia Ou & Shuo Chen

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  1. Chunyan Yu
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  2. Xie Quan
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  3. Xiaoxia Ou
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  4. Shuo Chen
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Correspondence to Xie Quan.

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Yu, C., Quan, X., Ou, X. et al. Effects of humic acid fractions with different polarities on photodegradation of 2,4-D in aqueous environments. Front. Environ. Sci. Eng. China 2, 291–296 (2008). https://doi.org/10.1007/s11783-008-0049-1

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  • DOI: https://doi.org/10.1007/s11783-008-0049-1

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