Microgravimetric Modeling-A New Method for Extracting Adsorption Parameters of Functionalized MIL-101(Cr)

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Formaldehyde is a volatile air pollutant from indoor sources, posing health risks.
• Real-time, low-concentration formaldehyde detection is crucial for public health.
• Existing detection methods may lack sensitivity or selectivity.

Purpose of the Study:

• To develop a sensitive and selective formaldehyde sensor.
• To investigate the gas sensing mechanism of functionalized MIL-101(Cr) materials.
• To evaluate the potential of ethylenediamine-functionalized MIL-101(Cr) (ED-MIL-101(Cr)) for formaldehyde monitoring.

Main Methods:

• Preparation of ethylenediamine-functionalized MIL-101(Cr) (ED-MIL-101(Cr)).
• Gas sensing performance evaluation using a cantilever sensor.
• Quasi-in situ infrared spectroscopy to study the interaction mechanism.
• Adsorption enthalpy calculation to understand binding characteristics.

Main Results:

• ED-MIL-101(Cr) exhibited superior formaldehyde gas sensing performance compared to bare MIL-101(Cr).
• The interaction mechanism involves Schiff base formation, indicating weak chemical adsorption (-52.6 kJ/mol).
• ED-MIL-101(Cr) showed good selectivity, a larger response value, and longer saturation time due to more active sites.

Conclusions:

• ED-MIL-101(Cr) is a promising material for sensitive and selective formaldehyde detection.
• The combination of experimental and computational approaches elucidates the gas sensing mechanism.
• This research highlights strong potential for practical formaldehyde monitoring applications.