Fabrication of γ-Fe2O3 nanoparticles by solid-state thermolysis of a metal-organic framework,MIL-100(Fe),for heavy metal ions removal

Porous γ-fe2o3 nanoparticles were prepared via a solid-state conversion process of a mesoporous iron(iii) carboxylate crystal,mil-100(fe). first,the mil-100(fe) crystal that served as the template of the metal oxide was synthesized by a low-temperature (<100°c) synthesis route. subsequently,the porous γ-fe2o3 nanoparticles were fabricated by facile thermolysis of the mil-100(fe) powders via a two-step calcination treatment.the obtained γ-fe2o3 was characterized by x-ray diffraction (xrd),n2 adsorption,x-ray photoelectron spectroscopy (xps),and scanning electron microscopy (sem) techniques,and then used as an adsorbent for heavy metal ions removal in water treatment. this study illustrates that the metal-organic frameworks may be suitable precursors for the fabrication of metal oxides nanomaterials with large specific surface area,and the prepared porous γ-fe2o3 exhibits a superior adsorption performance for as(v) and as(iii) ions removal in water treatment. copyright © 2014 shengtao hei et al.