Carbonate-Based Zeolitic Imidazolate Framework for Highly Selective CO<sub>2</sub> Capture
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Abstract
In
this study, we report the formation of a new crystal structure, ZIF-CO<sub>3</sub>-1, which results from the reaction of Zn<sup>2+</sup>, 2-methylimidazole,
and carbonate. ZIF-CO<sub>3</sub>-1 can be synthesized solvothermally
in <i>N</i>,<i>N</i>-dimethylformamide (DMF)/water
(H<sub>2</sub>O) or by utilizing of CO<sub>2</sub> gas at various
temperatures in DMF/H<sub>2</sub>O or H<sub>2</sub>O. This reaction
selectively consumes CO<sub>2</sub> because CO<sub>2</sub> is incorporated
in the ZIF as carbonate. CO<sub>2</sub> can be quantitatively released
by acidifying the ZIF. Powder X-ray diffraction, single-crystal X-ray
diffraction, FTIR spectroscopy, scanning electron microscopy, elemental
analysis, and thermogravimetric analysis were used to characterize
the ZIF structure. ZIF-CO<sub>3</sub>-1 (chemical formula C<sub>9</sub>H<sub>10</sub>N<sub>4</sub>O<sub>3</sub>Zn<sub>2</sub>), crystallizes
in the orthorhombic crystal system with noncentrosymmetric space group <i>Pba</i>2
