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Visualization of Silver Nanoparticle Formation on Nanoscale Zero-Valent Iron
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2018-06-12 , DOI: 10.1021/acs.estlett.8b00259
Lan Ling 1, 2 , Chenliu Tang 1, 2 , Wei-xian Zhang 1, 2
Affiliation  

Instant reactions of Ag(I) on nanoscale zero-valent iron (nZVI) were visualized with spherical-aberration-corrected scanning transmission electron microscopy (Cs-STEM) integrated with X-ray energy dispersive spectroscopy. In particular, the rapid growth of pure silver nanoparticles on nZVI was captured with high-resolution STEM imaging. Dissolved silver ions are attracted to the negatively charged iron nanoparticles and quickly reduced to metallic silver on the defective and electron-rich iron surface. Small (∼1–2 nm) and highly reactive silver nanoparticles are formed along the long chains of nZVI. Results reinforce the applications of nZVI for rapid enrichment, complete separation, and recovery of precious metals such as Au and Ag from trace-level sources such as wastewater and demonstrate the potential of analytical electron microscopy for mapping pollutant reactions on the surface of nanoparticles.

中文翻译:

纳米级零价铁上银纳米颗粒形成的可视化

Ag(I)在纳米级零价铁(nZVI)上的即时反应通过集成了X射线能量色散光谱学的球差校正扫描透射电子显微镜(Cs-STEM)进行了可视化。尤其是,通过高分辨率STEM成像捕获了纯银纳米颗粒在nZVI上的快速生长。溶解的银离子被带负电的铁纳米颗粒吸引,并在有缺陷和富电子的铁表面上迅速还原为金属银。沿着nZVI的长链形成小的(约1-2 nm)和高反应性的银纳米颗粒。结果加强了nZVI在快速富集,完全分离,
更新日期:2018-06-12
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