Characterization of organo-mineral aggregates of chernozem in northeast China and their adsorption behavior to phenanthrene

Qing Huang, Fasheng Li*, Ru Xiao, Qunhui Wang, Wenjie Tan

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

13 引用 (Scopus)

摘要

Organo-mineral aggregares in various fractions including clay, silt, fine sand, and coarse sand were isolated from a Chernozem in northeast China by ultrasonic dispersion in water followed by sedimentation. The physicochemical properties of different fractions were determined and the organo-mineral aggregates were characterized jointly with Fourier-transform infrared (FTIR) spectrometry, scanning electron microscopy (SEM), x-ray diffraction (XRD), and cross-polarization (CP) with magic-angle spinning (MAS) 13C nuclear magnetic resonance (NMR) spectrometry. The XRD patterns showed that clay was dominated by quartz and calcite, while the mineral assemblage of silt was composed of quartz, calcite, plagioclase, and trace amounts of mica and chlorite. The results from FTIR spectra were consistent with those from XRD. The SEM images indicated that the particle surface became smoother with increasing particle size. The CP-MAS 13C NMR spectra showed that the contents of aromatic C in clay, silt, fine sand, and coarse sand were 25.6, 28.19, 17.22, and 26.32%, respectively. The adsorprion and desorption behaviors of polycyclic aromatic hydrocarbons on four soil fractions were investigated using phenanthrene as a model substrate. The adsorption and desorption isotherms for all the fractions were well described by the modified Freundlich equation, and batch experiments demonstrated that the adsorption capacity increased with decreasing particle size. The desorption capacities of phenanthrene on clay and silt were larger than that of sand. The organic C normalized adsorption coefficients were positively correlated with the contents of nonpolar and aromatic C. The adsorption mechanism may be that phenanthrene undergoes a .-. interaction with organic matter of aggregates and is adsorbed on the aggregates.

源语言英语
页(从-至)362-369
页数8
期刊Soil Science Society of America Journal
72
2
DOI
出版状态已出版 - 3月 2008

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