A two-dimensional magnetic hybrid material based on intercalation of a cationic Prussian blue analog in montmorillonite nanoclay

Abstract

A highly ordered two-dimensional hybrid magnetic nanocomposite has been prepared by synthesizing and intercalating a new cationic aluminum-hydroxy ferric ferrocyanide compound into a cation-adsorbing nanoclay (montmorillonite). Chemical and structural properties were investigated by X-ray diffraction, transmission electron microscopy, thermogravimetric and differential thermal analyses, Fourier transform infrared, X-ray photoemission, and Mössbauer spectroscopies. Elemental analysis was based on proton-induced gamma ray emission and X-ray fluorescence spectroscopy data, N/C elemental ratios, and cation-exchange capacity measurements. Magnetic properties were studied by SQUID magnetometry. The results suggest: (i) that the cationic Prussian blue analog comprises Al-hydroxy cations embedded into a monolayer thick two-dimensional ferric ferrocyanide array; and (ii) that the clay-Prussian blue nanohybrid consists of such arrays stacked between the clay layers. The latter material orders ferromagnetically at approximately 5K showing a hundred times higher remanence than that of the starting material, soluble Prussian blue (ammonium ferric ferrocyanide).

Effect of [Fe(CN)6]4– Substitutions on the Spin-Flop Transition of a Layered Nickel Phyllosilicate

“…An important finding in the N 1s spectrum of the modified material is the appearance of an additional peak characteristic for cyanide groups at 398 eV, which not present in the corresponding spectrum of the parent material. This strongly suggests the successful intercalation of CN – groups within the interlayer space . The exchange of the acetate by the ferrocyanide groups within the interlayer space is further supported by quantitative XPS results.…”

“…This strongly suggests the successful intercalation of CN − groups within the interlayer space. 25 The exchange of the acetate by the ferrocyanide groups within the interlayer space is further supported by quantitative XPS results. In fact, XPS provides not only qualitative but also quantitative information, 26 since the peak areas normalized with the atomic sensitivity factors are proportional to the number of the corresponding atoms within the sampling depth.…”

Efficient removal of Orange G using Prussian Blue nanoparticles supported over alumina

“…As a whole, while the alumina support presents nil adsorption capacity, when the PBNP are synthetized over the alumina, the adsorption capacity of the solid is greatly enhanced. This could be related to the crystalline structure of PBNP, which generally exhibits vacancies, capable to accommodate neutral molecules or composites with anionic hosts [15,16].…”

Silicate-based multifunctional nanostructured materials with magnetite and Prussian blue: application to cesium uptake

“…[3][4][5] These compounds are prepared by precipitation of iron or other transition metal ions with hexacyanoferrate anions, 6,7 being frequently synthesized on diverse types of supports in order to overcome the problems related to the fragility and the small particle size of the resulting crystals. Among these supports, ion-exchange resins, 8,9 activated carbon, 10 mesoporous silica [11][12][13] and silicates [14][15][16] have been commonly employed. Similarly, iron oxide particles have been used as support of hexacyanoferrates in order to prot from their magnetic properties in the separation process.…”