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Study on the characteristics of naturally formed TiO2 nanoparticles in various surficial media from China
Chemical Geology ( IF 3.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.chemgeo.2020.119703 Guai Hu , Jianjin Cao , Caiyun Wang , Meiqu Lu , ZiXia Lin
Chemical Geology ( IF 3.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.chemgeo.2020.119703 Guai Hu , Jianjin Cao , Caiyun Wang , Meiqu Lu , ZiXia Lin
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Abstract To better understand the occurrence state and characteristics of naturally formed TiO2 in the environment, four types of different natural media were collected from nine areas distributed throughout five different provinces in China. For the first time, this study demonstrated that naturally formed TiO2 nanoparticles are widely distributed in various media (soil solid, underground water, geogas and organisms) on the surface of the earth. With the help of a high-resolution transmission electron microscope (TEM), the morphology, chemical composition and crystal structure of TiO2 nanoparticles in natural media were obtained. The characteristics of natural TiO2 nanoparticles were found to be different from those of engineered TiO2 nanoparticles, while natural TiO2 nanoparticles in different media were found to have similar characteristics. In general, single naturally formed TiO2 nanoparticles usually appear as complete or incomplete polygons, while aggregations of naturally formed TiO2 nanoparticle are mostly irregular in shapes. The main growth stages of TiO2 crystals in natural media were also investigated in this study. In brief, along with the crystal shapes of the TiO2 particles changing from imperfect to perfect, the degree of crystallinity of the particles was also gradually improved. Furthermore, natural TiO2 nanoparticles were found to always carry some amount of other elements related to the surrounding environment, resulting in a more complex composition. This phenomenon may contribute to the interpretation of elemental migration and ore prospecting to some degree, but the potential environmental hazards associated with TiO2 nanoparticles may be enhanced as well.
更新日期：2020-09-01
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