Journal
SUSTAINABILITY
Volume 14, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/su14031152
Keywords
metal-organic framework; MIL-101; solvent free; adsorption; carbon dioxide
Funding
- Universiti Tunku Abdul Rahman under UTAR Research Fund (UTARRF) [IPSR/RMC/UTARRF/2020-C2/C05]
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This study investigates the solvent-free synthesis of MIL-101(Cr) as a green alternative to the hazardous solvent method. MIL-101(Cr) demonstrates high thermal stability and its CO2 adsorption capacity is influenced by its surface area and pore volume.
MIL-101(Cr), a subclass of metal-organic frameworks (MOFs), is a promising adsorbent for carbon dioxide (CO2) removal due to its large pore volume and high surface area. Solvent-free synthesis of MIL-101(Cr) was employed in this work to offer a green alternative to the current approach of synthesizing MIL-101(Cr) using a hazardous solvent. Characterization techniques including XRD, SEM, and FTIR were employed to confirm the formation of pure MIL-101(Cr) synthesized using a solvent-free method. The thermogravimetric analysis revealed that MIL-101(Cr) shows high thermal stability up to 350 degrees C. Among the materials synthesized, MIL-101(Cr) at the molar ratio of chromium precursor to terephthalic organic acid of 1:1 possesses the highest surface area and greatest pore volume. Its BET surface area and total pore volume are 1110 m(2)/g and 0.5 cm(3)/g, respectively. Correspondingly, its CO2 adsorption capacity at room temperature is the highest (18.8 mmol/g), suggesting it is a superior adsorbent for CO2 removal. The textural properties significantly affect the CO2 adsorption capacity, in which large pore volume and high surface area are favorable for the adsorption mechanism.
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