Synthesis of porous superparamagnetic iron oxides from colloidal nanoparticles: Effect of calcination temperature and atmosphere

被引：10

作者：

Cheng, Wei ^{[1
]}

Xu, Jing ^{[1
]}

Ding, Wei ^{[1
]}

Wang, Yajie ^{[1
]}

Zheng, Wenping ^{[1
]}

Wu, Feng ^{[1
]}

Li, Jinjun ^{[1
]}

机构：

[1] Wuhan Univ, Hubei Key Lab Bioresources & Environm Biotechnol, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2015年 / 153卷

基金：

中国国家自然科学基金;

关键词：

Magnetic materials; Nanostructures; Chemical synthesis; Adsorption; GAMMA-FE2O3; NANOPARTICLES; MAGNETITE NANOPARTICLES; BIOMEDICAL APPLICATIONS; FE2O3; REMOVAL; CARBON; NANOCRYSTALS; OXIDATION; AS(III);

D O I：

10.1016/j.matchemphys.2015.01.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanostructured iron oxides with superparamagnetism were synthesized from colloidal particles of hydrous iron oxide. The synthesis procedure involved preparation of acetone-nanoparticle composite and calcination of the composite in air or nitrogen. The effects of calcination temperature and atmosphere on the properties of the products were investigated. Powder X-ray diffraction, Fe-57 Mossbauer spectra, transmission electron microscopy, nitrogen sorption, thermal analysis and vibrating-sample magnetometry were applied to characterize the materials. The products calcined in flowing air are composed of nanoparticles, while those calcined in flowing nitrogen contain nanosheets. The former has larger specific surface areas, whereas the latter has stronger saturation magnetization in external magnetic field. Increasing calcination temperature reduced the specific surface area of the product, whereas enhanced its saturation magnetization. Furthermore, the iron oxides with superparamagnetism showed good affinity to arsenite, and therefore they could be potential adsorbents for arsenic remediation in water. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：187 / 194

页数：8

共 46 条

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