Differences in NH3 gas adsorption behaviors of metal-hexacyanoferrate nanoparticles (Mx[FeII(CN)6]y·zH2O:M = In3+, Fe3+, and Mn2+)

Abstract Three different metal hexacyanoferrate nanoparticles (M-HCF-NPs, M = In 3+ , Fe 3+ , and Mn 2+ ) were characterized by XRD, SEM, elemental analyses, IR and isotherm measurements. The obtained M-HCF-NPs prepared by a simple mixing procedure have a Prussian blue-type cubic crystal structure and sizes of around 20 nm. The chemical compositions measured by the elemental analyses are In-HCF = K 0.039 In[Fe(CN) 6 ] 0.75 ·Cl 0.032 ·3.8H 2 O, Fe-HCF (PB) = K 0.18 Fe[Fe(CN) 6 ] 0.80 ·3.8H 2 O, and Mn-HCF = K 1.3 Mn[Fe(CN) 6 ] 0.84 ·1.3H 2 O. Ammonia gas isotherms under vacuum revealed that the ammonia adsorption capacity of the M-HCF-NPs is in order of Mn  3 species into stable NH 4 + cations in M-HCF.