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Springer Science and Business Media LLC Scientific Reports 13(1)
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    초록·키워드

    Metal-organic frameworks (MOFs) and zeolitic imidazolate frameworks (ZIFs) are promising porous materials for adsorption and storage of greenhouse gases, especially CO<sub>2</sub>. In this study, guided by the CO<sub>2</sub> phase diagram, we explore the adsorption behavior of solid CO<sub>2</sub> loaded with ZIF-8 framework by heating the sample under high pressures, resulting in a drastic improvement in the CO<sub>2</sub> uptake. The behavior of CO<sub>2</sub> under simultaneous high temperature (T) and pressure (P) conditions is directly monitored by in situ FTIR spectroscopy. The remarkable enhancement in CO<sub>2</sub> adsorption capability observed can be attributed to the synergetic effect of high T and P: high temperature greatly enhances the transport property of solid CO<sub>2</sub> by facilitating its diffusion into the framework; high pressure effectively modifies the pore size and shape via changing the linker orientation and creating new adsorption sites within ZIF-8. Our study thus provides important new insights into the tunability and enhancement of CO<sub>2</sub> adsorptive capability in MOFs/ZIFs using pressure and temperature combined as a synergetic approach.

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