Abstract
We report on the successful synthesis of diammonium magnesium dihydrogendiphosphate (V) dihydrate compound (NH4)2Mg(H2P2O7)2•2H2O using a wet chemical route. Single crystal X-ray diffraction analysis and micro Raman spectroscopy are employed to characterize the compound. We demonstrate, using a multidisciplinary approach, that this compound is ideal for carbon dioxide (CO2) capture in addition to other anthropogenic gasses. We show here -from both an experimental as well as from a density functional theory (DFT) calculations routes- the potential for adopting this compound into domestic air-conditioning units (ACUs). From these experiments, the resistance to bacterial growth is also investigated, which is critical for the adoption of this compound in ACUs. Our compound exhibits a higher methane (CH4) sorptivity as compared to CO2 at 25 °C and 45 °C under pressures up to 50 bars. Furthermore, DFT electronic structure calculations are used to compute the main structural and electronic properties of the compound, taking into consideration the characteristics of the identified pores as a function of the progressive CO2 vs. CH4 loadings. Finally, the antibacterial assay reveals a strong antibacterial activity against the tested Gram-positive and Gram-negative bacteria, with a large zone of inhibition against the tested E. Coli, S. Aureus and K. Pneumonia.
Highlights
We report on the successful synthesis of diammonium magnesium dihydrogendiphosphate (V) dihydrate compound (NH4)2Mg(H2P2O7)22H2O using a wet chemical route
We report the synthesis of a (NH4)2Mg(H2P2O7)22H2O compound via a wet chemical route and its capacity for CO2 and CH4 sorption
The Mg atom lies on the inversion center (0, 1/2, 0) and is octahedraly coordinated by four O atoms from two bidendate H2P2O7 groups, and two water molecules in trans positions with respect to the basal plane containing phosphorous and magnesium atoms (Fig. 1b)
Summary
We report on the successful synthesis of diammonium magnesium dihydrogendiphosphate (V) dihydrate compound (NH4)2Mg(H2P2O7)22H2O using a wet chemical route. The factor group analysis predicts the distribution of irreducible representation of the internal modes of (H2P2O7)2-, (NH4)+ ions and H2O molecules in the unit cell of the crystal (NH4)2Mg (H2P2O7)22H2O, to be respectively as follows: G(H2P2O7)2− = 27Ag(Ra) + 27Au(IR) G(NH4)+ = 9Ag(Ra) + 9Au(IR)
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