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Vol. 26 No. 3 (2014): Vol 26 Issue 3

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Nanosheet-Assembled Hematite Spheres for Adsorption of Cr(VI)

https://doi.org/10.14233/ajchem.2014.15490
Weiwei Wang
School of Materials Science and Engineering, Shandong University of Technology, 12 Zhang Zhou Road, Zibo 255091, Shandong, P.R. China
Jialiang Yao
School of Materials Science and Engineering, Shandong University of Technology, 12 Zhang Zhou Road, Zibo 255091, Shandong, P.R. China

Corresponding Author(s) : Weiwei Wang

weiweiwangsd@aliyun.com

Asian Journal of Chemistry, Vol. 26 No. 3 (2014): Vol 26 Issue 3

Abstract

Fabricating complex architectures with small building blocks is an effective method to increase its surface area and improve its performance in removal of heavy metal. However, the techniques for preparing iron oxide complex structures still remain a challenge because of the rapid hydrolysis of Fe(III). We prepared a-Fe2O3 hierarchical spheres with nanosheet building units by using ascorbic acid to control the concentration and speed of hydrolysis of Fe(III). The phase, morphology and size of samples were characterized by X-ray powder diffraction and scanning electron microscopy. Experimental results showed that ascorbic acid had an important effect on the morphology and size of samples. Their adsorption activities were determined using Cr(VI) present in aqueous solution. The adsorption process fitted to Freundlich isotherm models for a-Fe2O3 hierarchical spheres. The adsorption kinetics followed pseudo-second-order rate kinetic model and a-Fe2O3 hierarchical spheres exhibited a better Cr(VI) adsorption property.

Keywords

Hematite Hierarchical sphere Adsorption property Cr(VI) Adsorption
Wang, W., & Yao, J. (2014). Nanosheet-Assembled Hematite Spheres for Adsorption of Cr(VI). Asian Journal of Chemistry, 26(3), 719–724. https://doi.org/10.14233/ajchem.2014.15490
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