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Dispersion-precipitation Synthesis of Nanosized Magnetic Iron Oxide for Efficient Removal of Arsenite in Water

Dispersion-precipitation Synthesis of Nanosized Magnetic Iron Oxide for Efficient Removal of Arsenite in Water

Wei Cheng, Jing Xu, Yajie Wang, Feng Wu, Xiuyan Xu, Jinjun Li

J Colloid Interface Sci. 2015 May 1;445:93-101.

PMID: 25612934

Abstract:

Nanosized magnetic iron oxide was facilely synthesized by a dispersion-precipitation method, which involved acetone-promoted precipitation of colloidal hydrous iron oxide nanoparticles and subsequent calcination of the precipitate at 250°C. Characterization by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, nitrogen sorption, and vibrating-sample magnetometry revealed that the material was a composite of α-Fe2O3 and γ-Fe2O3 with primary particle size of 15-25 nm and specific surface area of 121 m(2)/g, as well as superparamagnetic property. The material was used as adsorbent for the removal of arsenite in water. Batch experiments showed that the adsorption isotherms at pH 3.0-11.0 fit the Langmuir equation and the adsorption obeys pseudo-second-order kinetics. Its maximum sorption capability for arsenite is 46.5 mg/g at pH 7.0. Coexisting nitrate, carbonate, sulfate, chloride, and fluoride have no significant effect on the removal efficiency of arsenite, while phosphate and silicate reduce the removal efficiency to some extent. The As(III) removal mechanism is chemisorption through forming inner-sphere surface complexes. The efficiency of arsenic removal is still maintained after five cycles of regeneration-reuse.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1309371	Iron(III) oxide, dispersion		1309-37-1	Price

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