High-Performance Ethylene Glycol Sensor Based on Imine Covalent Organic Frameworks.

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Ethylene glycol poisoning is a significant risk due to its undetectable nature.
• Developing sensitive and selective monitoring methods for ethylene glycol is crucial for public safety.

Purpose of the Study:

• To synthesize and characterize novel covalent organic framework (COF) nanospheres for ethylene glycol detection.
• To evaluate the sensing performance, including sensitivity, selectivity, and stability, of the prepared COF nanospheres.

Main Methods:

• Covalent organic framework (COF) nanospheres were synthesized using scandium (III) trifluoromethanesulfonate as a catalyst at room temperature.
• Characterization techniques included XRD, SEM, TEM, FT-IR, UV-Vis, and BET analysis.
• Gas sensing performance was evaluated for ethylene glycol and various interfering gases.

Main Results:

• The synthesized COF nanospheres possess rough surfaces and mesoporous structures, enhancing active sites for gas sensing.
• The COF nanospheres demonstrated excellent response-recovery ability for ethylene glycol over 10 cycles with a detection limit of 40 ppb.
• High selectivity towards ethylene glycol was observed, with minimal response to common interfering gases.

Conclusions:

• The developed imine-conjugated COF nanospheres exhibit promising sensitivity and selectivity for ethylene glycol detection.
• The material's properties, including large surface area and hydrogen bonding interactions, contribute to its enhanced sensing capabilities.
• This research offers an effective method for ethylene glycol monitoring and broadens the applications of COF materials.