Desorption of Ammonia Adsorbed on Prussian Blue Analogs by Washing with Saturated Ammonium Hydrogen Carbonate Solution

Prussian blue analogs (PBAs) have been reported as promising ammonia (NH ) adsorbents with a high capacity compared to activated carbon, zeolite, and ion exchange resins. The adsorbed NH was desorbed by heating and washing with water or acid. Recently, we demonstrated that desorption was also possib...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2022-12, Vol.27 (24), p.8840
Main Authors: Usuda, Hatsuho, Mishima, Yoshie, Kawamoto, Tohru, Minami, Kimitaka
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbents
Adsorption
Ammonia
Ammonium
ammonium hydrogen carbonate
Analogs
Anions
Carbon dioxide
Carbonates
Cobalt
Copper
Crystal structure
Desorption
Ferricyanide
Ferrocyanide
Fourier transforms
Hydrogen
Infrared spectroscopy
Ion exchange
Ion exchange resins
Iron compounds
Iron cyanides
Metal ions
Oxidation
Pigments
Prussian blue analogs
Ratios
Resins
Spectrum analysis
Structural stability
Transition metals
X-ray diffraction
Zeolites
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Summary:Prussian blue analogs (PBAs) have been reported as promising ammonia (NH ) adsorbents with a high capacity compared to activated carbon, zeolite, and ion exchange resins. The adsorbed NH was desorbed by heating and washing with water or acid. Recently, we demonstrated that desorption was also possible by washing with a saturated ammonium hydrogen carbonate solution (sat. NH HCO ) and recovered NH as an NH HCO solid by introducing CO into the washing liquid after desorption. However, this has only been proven for copper ferrocyanide and the relationship between the adsorption/desorption behavior and metal ions in PBAs has not been identified. In this study, we investigated the adsorption/desorption behavior of PBAs that are complexes of first row transition metals with hexacyanometalate anions. Six types of PBAs were tested in this study and copper ferricyanide exhibited the highest desorption/adsorption ratio. X-ray diffraction results revealed high structural stability for cobalt hexacyanocobaltate (CoHCC) and nickel ferricyanide (NiHCF). The Fourier transform infrared spectroscopy results showed that the NH adsorbed on the vacancy sites tended to desorb compared to the NH adsorbed on the interstitial sites as ammonium ions. Interestingly, the desorption/adsorption ratio exhibited the Irving-Williams order.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules27248840