Synthesis and performance analysis of zeolitic imidazolate frameworks for CO₂ sensing applications

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Zeolitic Imidazolate Frameworks (ZIF-8) are porous materials with potential applications in gas sensing.
• Efficient and selective detection of carbon dioxide (CO2) is crucial for environmental monitoring and industrial safety.

Purpose of the Study:

• To investigate Zeolitic Imidazolate Frameworks (ZIF-8) as a sensing material for CO2 detection.
• To compare different synthesis techniques for ZIF-8, focusing on their impact on CO2 sensing performance.

Main Methods:

• Synthesis of ZIF-8 using room temperature, microwave-assisted, and ball milling techniques.
• Characterization of ZIF-8 samples using X-ray diffraction (XRD), FTIR, TGA, FE-SEM, and EDS.
• Evaluation of CO2 detection performance using fluorescence measurements, including limit of detection (LOD), selectivity, and recyclability.

Main Results:

• Ball milling is a green, solvent-free synthesis method producing ZIF-8 with enhanced CO2 adsorption and detection.
• The ball milling technique resulted in a new ZIF-8 phase (ZIF-L) with distinct structural and sensing properties.
• The ZIF-8 sample synthesized via ball milling exhibited a LOD of 815.2 ppm, comparable to room temperature synthesis (723.8 ppm) but without harmful solvents.

Conclusions:

• Ball milling is a superior and environmentally friendly method for synthesizing ZIF-8 for CO2 sensing.
• ZIF-8 synthesized by ball milling demonstrates excellent potential for CO2 detection in indoor air quality monitoring and industrial applications.
• The room temperature synthesis method, while achieving a low LOD, involves hazardous solvents, making ball milling a more sustainable alternative.