基于红外光声光谱的蒙脱石-黄原糖复合体界面层特征研究
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国家自然科学基金项目(40871113)和中国科学院知识创新重要方向性项目(KZCX2-YW-QN411)资助


Characterization of the interface of xanthan-montmorillonite complex using Fourier Transform Infrared Photoacoustic Spectroscopy
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    摘要:

    黏土矿物-有机物复合体在土壤中具有重要的作用,而土壤黏土矿物-多糖复合体是黏土矿物-有机物复合体形成的前体,有利于复合体的形成和转化,但其具体的作用机制尚不清楚。本研究制备了蒙脱石-黄原糖模型复合体,采用X-衍射分析了复合体的结构信息,并利用傅里叶转换红外光声光谱原位逐层扫描功能,探测了蒙脱石-黄原糖复合体表面下不同深度的光谱信息。结果表明,蒙脱石与黄原糖的相互作用主要发生在蒙脱石的表面,并形成表面反应层;该表面层具有明显的红外光声光谱特征,所形成的复合体有更强的持水能力,且表层与亚表层的光谱信息明显不同;红外光声光谱逐层分析表明蒙脱石-黄原糖复合体界面反应层厚度大约在2.05~6.47 µm之间。本结果为揭示复杂的矿物-有机物复合体形成过程及其影响因素提供了定量依据。

    Abstract:

    Organo-mineral complexes play an important role in soil. Clay mineral-polysaccharide complex is a precursor, contributing to the formation of clay Organo-mineral complexes, but its specific functions remain unclear. Montmorillonite-xanthan complex was prepared and analyzed for its structure with X-diffraction and spectra at various depths with a Fourier transform infrared photoacoustic spectroscop (FTIR-PAS) that has the function of in-situ step-scanning. Results show that the interaction between montmorillonite and xanthan occurred mainly on the surface of montmorillonite, and subsequently formed an interfacial layer, which featured a distinct infrared photoacoustic spectrum; the formed complex demonstrated stronger water-holding capacity than montmorillonite, and its surface differed significantly from its subsurface in spectrum, and the interfacial layer of the montmorillonite-xanthan complex was approximately 2.05~6.47 µm thick according to the step-scanning with FTIR-PAS.

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周桂勤,杜昌文,周健民,王火焰,陈小琴.基于红外光声光谱的蒙脱石-黄原糖复合体界面层特征研究[J].土壤学报,2011,48(4):759-765. DOI:10.11766/trxb201005060175 Du Changwen. Characterization of the interface of xanthan-montmorillonite complex using Fourier Transform Infrared Photoacoustic Spectroscopy[J]. Acta Pedologica Sinica,2011,48(4):759-765.

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  • 收稿日期:2010-05-06
  • 最后修改日期:2010-08-18
  • 录用日期:2010-09-25
  • 在线发布日期: 2011-03-04
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