Amino-Functionalized β-Cyclodextrin to Construct Green Metal-Organic Framework Materials for CO₂ Capture

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Conventional alkanolamine adsorbents for CO2 capture are not environmentally friendly for industrial use.
• There is a need for sustainable and efficient materials for carbon capture technologies.

Purpose of the Study:

• To synthesize and characterize a novel amino-functionalized β-cyclodextrin metal-organic framework (NH2-β-CD-MOF).
• To evaluate the CO2 adsorption capacity, selectivity, and stability of the synthesized material.
• To investigate the CO2 adsorption mechanism and recyclability of NH2-β-CD-MOF.

Main Methods:

• Amino-functionalization of β-cyclodextrin (β-CD) to create NH2-β-CD-MOF.
• Material characterization using single-crystal X-ray diffraction, powder X-ray diffraction, SEM, DSC, TGA, elemental analysis, and N2 adsorption/desorption.
• CO2 adsorption and selectivity measurements, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy for mechanism analysis.

Main Results:

• NH2-β-CD-MOF exhibits a CO2 adsorption capacity of 12.3 cm3/g, 10 times higher than β-CD-MOF.
• The material shows outstanding selective adsorption of CO2/N2 with a ratio of 947.52.
• NH2-β-CD-MOF demonstrates enhanced water stability compared to β-CD-MOF and γ-CD-MOF and is recyclable via ultrasonication.

Conclusions:

• NH2-β-CD-MOF is a highly efficient and selective adsorbent for CO2 capture.
• The novel material offers improved stability and recyclability, addressing limitations of existing adsorbents.
• This development presents a greener and more sustainable approach for industrial carbon capture applications.