Prussian Blue Analogues of A2[Fe(CN)6] (A: Cu2+, Co2+, and Ni2+) and Their Composition-Dependent Sorption Performances towards Cs+, Sr2+, and Co2+

Abstract

Investigation in radioactive contaminant removal from aqueous solutions has been considered essential upon unexpected nuclear accidents. In this report, we have successfully prepared Prussian blue analogues (PBAs) with different substituted cations (A2[Fe(CN)6] (A: Cu2+, Co2+, and Ni2+)). The synthesized PBAs were characterized and employed for the removal of Cs+, Sr2+, and Co2+ as sorption models, which are commonly found in radioactive waste. Sorption examinations reveal that Cu2[Fe(CN)6] has the highest sorption capacity towards Cs+, Sr2+, and Co2+ compared with those of Co2[Fe(CN)6] and Ni2[Fe(CN)6]. This is mainly attributed to the cation-exchange ability of substituted metal within the framework of PBAs. The sorption mechanism is qualitatively and quantitatively supported by infrared spectroscopy (IR) and total reflection X-ray fluorescence spectroscopy analysis (TXRF). In addition, it was found that Cs+ is adsorbed most effectively by PBAs due to the size matching between Cs+ ions and the channel windows of PBAs. These findings are important for the design of sorbents with suitable ion-exchange capacity and selectivity toward targeted radioactive wastes.

Highly Efficient and Low-Cost CuFeCN as an OER and HER Electrocatalyst for Sustainable Hydrogen Production

“…The peaks at 594 and 488 cm –1 may be ascribed to Fe–CN and Fe–C bonding . The observed peak around 2102 cm –1 corresponds to the CN vibration peak in Cu­[FeCN] …”

“…This unique pattern is a result of the cubic M II [Fe­(CN) 6 ] framework, which consists of an octahedral [Fe­(CN) 6 ] n structure coordinated with nitrogen-bound M III ions. Cu@FeCN architecturally solidified as a result in the Fm3m space group. , Field emission scanning electron microscopy (FESEM) images of the catalyst show evenly dispersed spherical clusters. The SEM image displayed a large amount of accessible catalytic active sites (Figure a).…”

“…1 The observed peak around 2102 cm −1 corresponds to the CN vibration peak in Cu [FeCN]. 38 The powder XRD was used to analyze the crystalline characteristics of the catalyst-synthesized material, and the results are displayed in Figure 1b. Particularly, the intense peaks observed at 2θ values 17, 24, 35, 39, and 43°c orresponding to the (2 0 0), (2 2 0), (4 0 0), (4 2 0), (4 2 2) for planes of the complex.…”

Multiscale structural control of thiostannate chalcogels with two-dimensional crystalline constituents

“…Cs + and Sr 2+ were selected as the targeting adsorbates due to their mid-range half-lives (t 1/2 = 30.2 and 28.8 years, respectively) and high fission yields (6.3 and 4.5%, respectively) 54 . Precedent examples of Cs + and Sr 2+ capture materials exist in the form of inorganic compound 29,55,56 , carbon heterostructure 27,57,58 , Prussian blue pigments [59][60][61] , metalorganic-framework 62 , and chalcogels 13 , but most of them are only functional in complex heterostructure form or require multiple steps of synthetic protocols (Supplementary Table 3). In contrast, NMSCs are anticipated to be functional for Cs + and Sr 2+ capture through ionexchange principle, as precedent layered chalcogenide compound (e.g., KMS-1) are known to attract them with high efficiency.…”

Phytic Acid Doped Polyaniline as a Binding Coating Promoting Growth of Prussian Blue on Cotton Fibers for Adsorption of Copper Ions

“…Several types of porous inorganic materials [15] meeting the above standards have emerged in recent years, including clay [16], zeolite [17], montmorillonite [18], Prussian blue (PB) [19], Prussian blue analogues (PBAs) [20], etc. In particular, PB and PBAs are kinds of special metal-organic frameworks (MOFs) combined by transition metals (e.g., Fe 2+ , Fe 3+ , Cu 2+ , and Co 2+ ) and CN − ligand.…”