Environmental catalysis and materials

La-EDTA coated Fe3O4 nanomaterial: Preparation and application in removal of phosphate from water

Jiao Yang , Qingru Zeng , Liang Peng , Ming Lei , Huijuan Song , Boqing Tie , Jidong Gu


Received March 14, 2012,Revised May 24, 2012, Accepted , Available online February 02, 2013

Volume ,2013,Pages 413-418

La-EDTA-Fe3O4 was prepared by a chemical co-precipitation method. The magnetic composite was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Furthermore, the adsorption properties of La-EDTA-Fe3O4 toward phosphate in water were investigated. The uptake rate of phosphate in water by La-EDTA-Fe3O4 was 3-1000 times than that of EDTA-Fe3O4, and reached 97.8% at 7 hr. The adsorption process agreed well with the Freundlich model and kinetics studies showed that the adsorption of phosphate proceeds according to pseudo second-order adsorption kinetics. The maximum removal rate was achieved at pH 6.0-7.0. The La-EDTA-Fe3O4 had good adsorption properties and could be separated well from aqueous solution by a permanent magnet. Therefore, this nanomaterial has potential application for the removal of phosphate from large water bodies.

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