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 = In3+, Fe3+, and Mn2+) 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 = K0.039In[Fe(CN)6]0.75·Cl0.032·3.8H2O, Fe-HCF (PB) = K0.18Fe[Fe(CN)6]0.80·3.8H2O, and Mn-HCF = K1.3Mn[Fe(CN)6]0.84·1.3H2O. Ammonia gas isotherms under vacuum revealed that the ammonia adsorption capacity of the M-HCF-NPs is in order of Mn < In « Fe; however, the ammonia gas adsorption of In-HCF-NPs is faster than those of the Fe-HCF and Mn-HCF-NPs. This difference is considered to be caused by individual M-HCF structures, such as the vacancies in the HCF crystals, and by the interaction of individual M-HCF toward water molecules, which promote the conversion of NH3 species into stable NH4+ cations in M-HCF.
- Publication:
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Journal of Solid State Chemistry France
- Pub Date:
- February 2019
- DOI:
- 10.1016/j.jssc.2018.10.026
- Bibcode:
- 2019JSSCh.270..112M
- Keywords:
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- Indium hexacyanoferrate;
- Manganese hexacyanoferrate;
- Prussian blue;
- Nanoparticle;
- Ammonia adsorption;
- Characterization