| 人为土中纳米颗粒的发生、结构和矿物相 |
| |
| 作者姓名： | LU Sheng-Gao SUN Fang-Fang ZONG Yu-Tong |
| |
| 作者单位： | Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, College of Environmental and Resource Sciences, Zhejiang University;Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University |
| |
| 基金项目： | Supported by the National Natural Science Foundation of China (No. 40971131);the Ph.D. Program Foundation of Ministry of Education of China (No. 20090101110088) |
| |
| 摘 要： | Soils contain various kinds of crystalline to amorphous solid particles with at least one dimension in the nanoscale (<100nm). These nanoparticles contribute greatly to dynamic soil processes such as soil genesis, trace element cycling, contaminant transport, and chemical reaction. The nano-sized fraction of an Anthrosol was obtained to determine the occurrence, chemical composition, structure, and mineral phases of nanoparticles using high-resolution transmission electron microscopy (HRTEM) equipped with an energy-dispersive X-ray spectroscopy. Selected area electron diffraction or the fast Fourier transform of high-resolution images was used in structural characterization of the nanoparticles with HRTEM. Two nanoscale mineral types, i.e., mineral nanoparticles and nanominerals, were observed in the Anthrosol. Mineral nanoparticles in soil included well crystalline aluminumsilicate nanosheets, nanorods, and nanoparticles. Nanosheets with a length of 120-150 nm and a width of about 10-20 nm were identified as chlorite/vermiculite series. The presence of clear lattice fringe spacing in HRTEM image of nanoparticles indicated that mineral nanoparticles had a relatively good crystallinity. The nanomineral ferrihydrite also existed in the Anthrosol. The HRTEM images and the particle size distribution histogram suggested that these ferrihydrite nanoparticles were quite homogeneous, and had a narrow size distribution range (1-7 nm) with a mean diameter of 3.6±1.6 nm. Our HRTEM observation indicated that mineral nanoparticles and nanominerals were common and widely distributed in Anthrosols. HRTEM and selected area diffraction or lattice fringe spacing characterization provided further proofs to the structure of nanoparticles formed in soil.energy-dispersive X-ray spectroscopy (EDS), ferrihydrite, high-resolution transmission electron microscopy (HRTEM), nanominerals, nano-sized fraction
|
| 关 键 词： | energy-dispersive X-ray spectroscopy (EDS) ferrihydrite high-resolution transmission electron microscopy (HRTEM) nanominerals nano-sized fraction |
| 收稿时间： | 17 August 2012 |
Occurrence, structure and mineral phases of nanoparticles in an Anthrosol |
| |
| LU Sheng-Gao,SUN Fang-Fang,ZONG Yu-Tong.Occurrence, structure and mineral phases of nanoparticles in an Anthrosol[J].Pedosphere,2013,23(3):273-280. |
| |
| Authors: | LU Sheng-Gao SUN Fang-Fang and ZONG Yu-Tong |
| |
| Institution: | Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, College of Environmental and Resource Sciences,Zhejiang University, Hangzhou 310058,China;Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058 China |
| |
| Abstract: | Soils contain various kinds of crystalline to amorphous solid particles with at least one dimension in the nanoscale (<100 nm). These nanoparticles contribute greatly to dynamic soil processes such as soil genesis, trace element cycling, contaminant transport, and chemical reaction. The nano-sized fraction of an Anthrosol was obtained to determine the occurrence, chemical composition, structure, and mineral phases of nanoparticles using high-resolution transmission electron microscopy (HRTEM) equipped with an energy-dispersive X-ray spectroscopy. Selected area electron diffraction or the fast Fourier transform of high-resolution images was used in structural characterization of the nanoparticles with HRTEM. Two nanoscale mineral types, i.e., mineral nanoparticles and nanominerals, were observed in the Anthrosol. Mineral nanoparticles in soil included well crystalline aluminumsilicate nanosheets, nanorods, and nanoparticles. Nanosheets with a length of 120--150 nm and a width of about 10--20 nm were identified as chlorite/vermiculite series. The presence of clear lattice fringe spacing in HRTEM image of nanoparticles indicated that mineral nanoparticles had a relatively good crystallinity. The nanomineral ferrihydrite also existed in the Anthrosol. The HRTEM images and the particle size distribution histogram suggested that these ferrihydrite nanoparticles were quite homogeneous, and had a narrow size distribution range (1--7 nm) with a mean diameter of 3.6 ± 1.6 nm. Our HRTEM observation indicated mineral nanoparticles and nanominerals were common and widely distributed in Anthrosols. HRTEM and selected area diffraction or lattice fringe spacing characterization provided further proofs to the structure of nanoparticles formed in soil. |
| |
| Keywords: | energy-dispersive X-ray spectroscopy (EDS) ferrihydrite high-resolution transmission electron microscopy (HRTEM) nanominerals nano-sized fraction |
| 本文献已被 CNKI 万方数据 ScienceDirect 等数据库收录！ |
| 点击此处可从《土壤圈》浏览原始摘要信息 |
| 点击此处可从《土壤圈》下载免费的PDF全文 |
|
