Issue 86, 2016, Issue in Progress

Preparation of α-Fe2O3 hollow spheres, nanotubes, nanoplates and nanorings as highly efficient Cr(vi) adsorbents

Abstract

α-Fe2O3 nanoparticles with different morphologies, such as hollow spheres, nanotubes with a limited amount of the {0001} plane exposed, and nanoplates and nanorings with the {0001} plane predominantly exposed, have been synthesised by using NaH2PO4 and urea in a facile hydrothermal method. The mechanism of the morphology evolution from hollow sphere to nanoring has been investigated. It is proposed that the polymerisation of Fe3+/H2PO4 plays an important role in the formation of these morphologies. The adsorption of Cr(VI) from aqueous solution onto these α-Fe2O3 nanoparticles showed that the α-Fe2O3 with nanoring morphology has the highest removal efficiency, and the adsorption capacity reached 16.9 mg g−1. These results indicate that the adsorption mechanism of Cr(VI) onto hematite nanoparticles is a chemisorption process through doubly and triply coordinated hydroxyl groups on the outer surface of α-Fe2O3.

Graphical abstract: Preparation of α-Fe2O3 hollow spheres, nanotubes, nanoplates and nanorings as highly efficient Cr(vi) adsorbents

Supplementary files

Article information

Article type
Paper
Submitted
12 Jun 2016
Accepted
22 Aug 2016
First published
23 Aug 2016

RSC Adv., 2016,6, 82854-82861

Preparation of α-Fe2O3 hollow spheres, nanotubes, nanoplates and nanorings as highly efficient Cr(VI) adsorbents

Z. Liu, R. Yu, Y. Dong, W. Li and W. Zhou, RSC Adv., 2016, 6, 82854 DOI: 10.1039/C6RA15245G

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