Abstract
Prussian blue (PB) and PB analogues (PBA) are coordination network materials that present important similarities with zeolites concretely with their ability of adsorbing cations. Depending on the conditions of preparation, which is cheap and easy, PB can be classified into soluble PB and insoluble PB. The zeolitic-like properties are mainly inherent to insoluble form. This form presents some defects in its cubic lattice resulting in an open structure. The vacancies make PB capable of taking up and trapping ions or molecules into the lattice. Important adsorption characteristics of PB are a high specific area (370 m2 g−1 determined according the BET theory), uniform pore diameter, and large pore width. PB has numerous applications in many scientific and technological fields. PB are assembled into nanoparticles that, due to their biosafety and biocompatibility, can be used for biomedical applications. PB and PBA have been shown to be excellent sorbents of radioactive cesium and radioactive and nonradioactive thallium. Other cations adsorbed by PB are K+, Na+, NH4+, and some divalent cations. PB can also capture gaseous molecules, hydrocarbons, and even luminescent molecules such as 2-aminoanthracene. As the main adsorptive application of PB is the selective removal of cations from the environment, it is important to easily separate the sorbent of the purified solution. To facilitate this, PB is encapsulated into a polymer or coats a support, sometimes magnetic particles. Finally, is remarkable to point out that PB can be recycled and the adsorbed material can be recovered.
Highlights
A zeolite is a crystalline, microporous, hydrated aluminosilicate mineral having an infinite, open, three-dimensional structure
The reported studies about the adsorption of Cs by Prussian blue (PB) or PB analogues (PBA) coincide in that this adsorption is a highly selective process that can be described by a pseudo-second-order kinetic model; this implies that the Cs+ was chemisorbed and the adsorption rate of the PB composite depended on the active sites rather than the concentration of Cs+ in the solution [39]
This review provides a report of the zeolitic properties of PB and PBA, namely its capacity of capturing ions and molecules
Summary
A zeolite is a crystalline, microporous, hydrated aluminosilicate mineral having an infinite, open, three-dimensional structure They have a framework structure that encloses interconnected cavities occupied by large metal cations (Na+ , K+ , Ca2+ , Mg2+ , and others) and water molecules. In the last 60 years, the study and characterization of zeolites has been an important factor for industrial progress, given their catalytic properties and their high adsorption and desiccant capabilities, permitting oil refining, industrial gasses treatments, industrial ovens, and industrial waste treatments Another application is water remediation, consisting of the removal of cationic pollutants such as ammonium as adsorbents in pollution control or the handling and storage of nuclear wastes [2]. We will highlight the applications of PB and PBA as adsorbents of cations: antidotes and binders of cations, among others
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