Issue 2, 2014

In situ controllable synthesis of magnetic Prussian blue/graphene oxide nanocomposites for removal of radioactive cesium in water

Abstract

A simple procedure at room temperature using non-toxic and cost-effective precursors has been developed to prepare magnetic Prussian blue/graphene oxide (PB/Fe3O4/GO) nanocomposites for the removal of radioactive cesium in water. Taking advantage of the combined benefits of GO and magnetic PB nanoparticles, PB/Fe3O4/GO nanocomposites exhibit excellent removal efficiency (over 90% for 50 ppm Cs+) and rapid separation from an aqueous solution by an external magnetic field. In addition, the adsorption behavior of these adsorbents fits well with the Langmuir isotherm and the pseudo-second-order kinetic model. Sorption of 70.25% Cs+ to PB/Fe3O4/GO was finished in less than 30 min, and the maximum adsorption capacity was 55.56 mg g−1. The improved adsorption efficiency and capacity of PB/Fe3O4/GO can be attributed to the anchoring technology, which reduced the aggregation of nanoparticles and increased the effective adsorption surface of the adsorbent. These nanocomposites present a high selectivity to Cs+ and extract it in trace amounts. The removal mechanism of Cs+ was revealed for the first time to be H+-exchange and/or ion trapping. The temperature and pH value both affect the sorption performance. The composites were stable in natural water, seawater, and acidic/basic solutions ranging from pH = 4 (HNO3) to 10 (NaOH) with negligible leaching of Fe.

Graphical abstract: In situ controllable synthesis of magnetic Prussian blue/graphene oxide nanocomposites for removal of radioactive cesium in water

Supplementary files

Article information

Article type
Paper
Submitted
05 Sep 2013
Accepted
16 Oct 2013
First published
17 Oct 2013

J. Mater. Chem. A, 2014,2, 326-332

In situ controllable synthesis of magnetic Prussian blue/graphene oxide nanocomposites for removal of radioactive cesium in water

H. Yang, L. Sun, J. Zhai, H. Li, Y. Zhao and H. Yu, J. Mater. Chem. A, 2014, 2, 326 DOI: 10.1039/C3TA13548A

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