Surfactant-Free, Size-Controllable, and Scalable Green Synthesis of ZIF-8 Particles with Narrow Size Distribution by...

Area of Science:

• Materials Science
• Nanotechnology
• Green Chemistry

Background:

• Nanoporous materials' properties depend on particle size and distribution.
• Zeolitic imidazolate frameworks (ZIF-8) are widely used but traditional synthesis methods involve costly and polluting surfactants/solvents.
• Controlling ZIF-8 particle size is crucial for optimizing its performance.

Purpose of the Study:

• To develop a surfactant-free, size-controllable, and scalable green synthesis method for ZIF-8 nanoparticles.
• To investigate the influence of reaction parameters on ZIF-8 crystal formation and growth.
• To demonstrate the large-scale synthesis and adsorption performance of size-controlled ZIF-8.

Main Methods:

• Investigated four reaction parameters: temperature, concentration, pouring time, and reactant ratio.
• Employed a green synthesis approach using water as the solvent and avoiding additives.
• Performed adsorption tests to evaluate the utility of ZIF-8 nanoparticles based on their size and distribution.

Main Results:

• Achieved surfactant-free, size-controllable synthesis of ZIF-8 nanoparticles with sizes ranging from 147-915 nm.
• Demonstrated a scalable 2 L synthesis of ZIF-8 with narrow particle size distribution.
• Confirmed the influence of reaction parameters on ZIF-8 nuclei formation and crystal growth.

Conclusions:

• The developed green synthesis method offers a cost-effective and environmentally friendly route to produce size-controlled ZIF-8.
• The ability to tune ZIF-8 particle size and distribution enables optimization for specific applications.
• This work provides a foundation for synthesizing size-controlled ZIF-8 and its composites for high-performance emerging applications.