Hyper-crosslinked polymeric ionic liquid (HCPIL)-based chainmail adsorbents for highly efficient gaseous toluene...

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) like Cu-BTC show promise for adsorption but often lack hydrophobicity.
• Surface engineering of MOFs is crucial for enhancing their performance in challenging environments.
• Hydrophobic ionic liquids (ILs) can impart water repellency and modify pore environments.

Purpose of the Study:

• To develop a novel hydrophobic chainmail adsorbent with enhanced gaseous toluene adsorption capacity.
• To investigate the effect of ionic liquid-based hyper-crosslinked polymer surface engineering on MOF properties.
• To evaluate the adsorbent's performance under high relative humidity.

Main Methods:

• Surface modification of Cu-BTC using ionic liquid-based hyper-crosslinked polymers (HCPIL).
• Characterization of the resulting Cu-BTC@HCPIL material, including water contact angle measurements.
• Gaseous toluene adsorption experiments under controlled relative humidity (RH = 80%).

Main Results:

• Developed a hydrophobic chainmail adsorbent (Cu-BTC@HCPIL) with a water contact angle up to 109.6°.
• Achieved a 6.2-fold enhancement in gaseous toluene adsorption capacity for Cu-BTC@HCPIL-2 compared to bare Cu-BTC (49 mg g⁻¹).
• Demonstrated superior adsorption performance under 80% RH due to hierarchical pores and hydrophobic ILs.

Conclusions:

• The developed Cu-BTC@HCPIL adsorbent offers a novel strategy for designing advanced hydrophobic materials.
• Surface engineering with hydrophobic ILs and HCPIL effectively enhances MOF adsorption capabilities, particularly for volatile organic compounds.
• This approach shows significant potential for environmental remediation applications, such as capturing pollutants from air.