Detection of SO₂ using a chemically stable Ni(II)-MOF

Area of Science:

• Materials Science
• Chemistry
• Environmental Science

Background:

• Sulfur dioxide (SO₂) is a harmful pollutant.
• Effective SO₂ capture and detection materials are crucial for environmental monitoring and remediation.
• Metal-organic frameworks (MOFs) offer tunable properties for gas adsorption and sensing.

Purpose of the Study:

• To investigate the SO₂ capture and detection capabilities of the MOF-type Ni₂(dobpdc).
• To evaluate the chemical stability, adsorption capacity, and cycling performance of Ni₂(dobpdc) for SO₂.
• To explore the mechanism behind SO₂ detection using fluorescence spectroscopy.

Main Methods:

• Synthesis and characterization of Ni₂(dobpdc).
• Gas adsorption experiments to determine SO₂ uptake capacity and stability.
• Fluorescence spectroscopy and time-resolved photoluminescence to study SO₂ detection and mechanism.

Main Results:

• Ni₂(dobpdc) exhibits high chemical stability towards SO₂.
• Achieved a high SO₂ capture capacity of 4.3 mmol g^-1 at 298 K and 0.05 bar.
• Demonstrated remarkable SO₂ detection selectivity and exceptional cycling performance.
• Proposed a plausible SO₂ detection mechanism based on time-resolved photoluminescence.

Conclusions:

• Ni₂(dobpdc) is a promising material for selective SO₂ capture and sensing applications.
• The material's stability and performance highlight its potential for environmental monitoring.
• Understanding the detection mechanism can guide the design of future MOF-based sensors.