Abstract
This study focused on the sorption isotherms of 1,1,1-trichloro-2,2-bis(p-chlorophenyl) ethane (p,p′-DDT) and 1,1-dichloro-2,2-bis(p-chlorophenyl) ethylene (p,p′-DDE) on different original clays (i.e., zeolite, montmorillonite and attapulgite) and organoclay complexes. Sorption of organic pollutants was determined using gas chromatographic (GC) techniques to investigate the sorption behavior, and characterize the effect of, different organic cations. The original clays only sorbed low amounts of p,p′-DDT and p,p′-DDE, and the sorptive curves can be classified as L-shaped. Organoclays exhibited higher amounts of p,p′-DDT and p,p′-DDE sorption. The p,p′-DDT and p,p′-DDE sorption increased with increasing total organic carbon (OC) content of the organoclays. For hexadecyltrimethylammonium (HDTMA)-modified organoclays, the dominant adsorptive medium showed the partitioning sorption of hydrophobic–hydrophobic interaction, indicating no competitive sorption. The sorptive curves can be classified as C-shaped of constant partition (CP). However, benzyltrimethylammonium (BTMA)-modified organoclays exhibited competitive sorption. The sorption isotherm curves can be classified as S-shaped. The sorptive capacity of the HDTMA-modified organoclays for p,p′-DDT were higher than those for p,p′-DDE, but the BTMA-modified organoclays showed a reverse trend. This can be attributed to the different structures and shapes of organic cations, giving different sorptive mechanisms. The p,p′-DDT and p,p′-DDE sorption onto HDTMA-modified organoclays were caused by chemical interaction, with the BTMA modified organoclays occuring due to physical sorption.
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Acknowledgements
We thank the National Key Basic Research Support Foundation (NKBRSF) of China (2002CB4108010) and Chinese Academy of Sciences (Project No. KSCX2-YW-N-038) grants supported for this study.
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Dai, RL., Zhang, GY., Gu, XZ. et al. Sorption of 1,1,1-trichloro-2,2-bis(p-chlorophenyl) ethane (DDT) by clays and organoclays. Environ Geochem Health 30, 479–488 (2008). https://doi.org/10.1007/s10653-007-9130-0
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DOI: https://doi.org/10.1007/s10653-007-9130-0