Transformation of clay minerals in nanoparticles of several zonal soils in China

文献类型： 外文期刊

第一作者： Zhang, Zhi Yi

作者： Zhang, Zhi Yi;Huang, Li;Liu, Fan;Ndzana, Georges Martial;Liu, Zhi Jie;Zhang, Zhi Yi;Wang, Ming Kuang

作者机构：

关键词： Clay minerals; Nanoparticles; Transformation; Zonal soils

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期： 2019 年 19 卷 1 期

页码：

收录情况： SCI

摘要： PurposeClay minerals significantly affect the physical, chemical, and biological processes of soils. They undergo spontaneous modification and transformation depending to the climatic conditions. Information concerning the compositions and transformation of clay minerals in nanoparticle colloids (NPs) (25-100nm) is severely lacking. Studying clay mineral transformation is important approach to understand soil formation. This study was conducted to determine the transformation sequence of clay minerals in several zonal soil NPs.Materials and methodsFour soils (Haplustalf, Alf-1; Hapludalf, Alf-2; Hapludults, Ult-1 and Ult-2) were collected from B horizons developed under three different climatic zones of China. Alf-1 (36 degrees 05 N and 117 degrees 24 E) was located under a warm temperate zone and Alf-2 (30 degrees 38 N and 115 degrees 26 E), Ult-1 (29 degrees 13 N and 113 degrees 46 E), and Ult-2 (19 degrees 27 N and 109 degrees 17 E) under a subtropical zone. The clay particles (<2000nm) (CPs) and nanoparticles (25-100nm) (NPs) of tested soils were separated. The element composition of CPs and NPs was identified by microwave digestion method. The mineralogy and chemical bonding of clay minerals were studied by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR).Results and discussionWith decreasing latitude, NPs and CPs showed that the molar ratio of SiO2 to Al2O3 trends to diminish, indicating the phenomenon of desilication and allitization in the tested soils. XRD analysis revealed that the main clay mineral of Alf-1 NPs was illite, followed by vermiculite, kaolinite, and kaolinite interstratified minerals (KIMs). The clay minerals of Alf-2, Ult-1, and Ult-2 NPs were dominated by kaolinite (and KIMs), followed by illite, with a little content of hydroxyl-interlayered vermiculite (HIV) in Ult-1 NPs and trace content of gibbsite in Ult-2 NPs. With decreasing latitude, vermiculite and HIV decreased in NPs. When compared to CPs, smectite as well as illite-vermiculite mix-layer mineral (I-V) and illite-HIV mix-layer mineral (I-HIV) were not detected in NPs. The analysis of d060 region by XRD showed that with decreasing latitude, the main clay minerals in NPs were dioctahedral minerals (e.g., illite or kaolinite). These clay minerals resulted from the transformation of trioctahedral minerals in CPs. The disappearance of 2:1 swelling minerals and trioctahedral minerals showed that the NPs were more susceptible to weathering than CPs.ConclusionsWith decreasing latitude, the transformation of clay minerals followed the sequence of illiteHIVkaolinitegibbsite in tested NPs.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序