Evolution of nanoscale zero-valent iron (nZVI) in water: Microscopic and spectroscopic evidence on the formation of nano- and micro-structured iron oxides

JOURNAL OF HAZARDOUS MATERIALS

卷:322

Article

Liu, Airong¹  Liu, Jing¹  Han, Jinhao¹  Zhang, Wei-Xian¹ 

[1] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China

关键词: Nanoscale zero-valent iron;    Evolution;    Oxic water;    Anoxic water;   

DOI  :  10.1016/j.jhazmat.2015.12.070

来源: Elsevier

【 摘 要 】

Knowledge on the transformation of nanoscale zero-valent iron (nZVI) in water is essential to predict its surface chemistry including surface charge, colloidal stability and aggregation, reduction and sorption of organic contaminants, heavy metal ions and other pollutants in the environment. In this work, transmission electronic microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy are applied to study the compositional and structural evolution of nZVI under oxic and anoxic conditions. Under anoxic conditions, the core-shell structure of nZVI is well maintained even after 72 h, and the corrosion products usually contain a mixture of wustite (FeO), goethite (alpha-FeOOH) and akaganeite (beta-FeoOH). Under oxic conditions, the core-shell structure quickly collapses to flakes or acicular-shaped structures with crystalline lepidocrocite (gamma-FeOOH) as the primary end product. This work provides detailed information and fills an important knowledge gap on the physicochemical characteristics and structural evolution of engineered nanomaterials in the environment. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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