Three-Dimensional Printing of Molecularly Imprinted Polymers by Digital Light Processing for Copper Ion Sequestration

Area of Science:

• Materials Science
• Polymer Chemistry
• Environmental Engineering

Background:

• Molecularly imprinted polymers (MIPs) are crucial for selective ion sequestration.
• Traditional MIP synthesis methods can be limited in structural control and efficiency.
• Additive manufacturing offers novel approaches for creating advanced polymer materials.

Purpose of the Study:

• To develop highly structured MIP networks for copper(II) ion sequestration using additive manufacturing.
• To investigate the influence of porogen composition on MIP morphology and performance.
• To compare the efficiency of 3D printed MIPs with conventionally synthesized MIPs.

Main Methods:

• Utilized photopolymerizable formulations with acrylic monomers and varying ratios of water/methanol as porogens.
• Employed additive manufacturing (3D printing) to create MIPs.
• Characterized MIP morphology using electron microscopy and analyzed copper distribution with X-ray fluorescence microscopy.
• Conducted adsorption-desorption tests to evaluate copper(II) ion binding capacity.

Main Results:

• 3D printed MIPs exhibited cauliflower-like multiscale structures influenced by porogen choice and fabrication.
• X-ray fluorescence microscopy confirmed layered structures and homogeneous copper distribution in printed MIPs.
• 3D printed MIPs showed up to ten times greater copper(II) ion absorption efficiency compared to bulk-polymerized MIPs.
• MIPs fabricated with 100% water as the porogen demonstrated the highest imprint recognition for copper(II) ions.

Conclusions:

• Additive manufacturing enables the creation of highly structured MIPs with enhanced performance for copper(II) ion sequestration.
• The choice of porogen significantly impacts MIP morphology and adsorption efficiency.
• 3D printed MIPs represent a promising advancement over traditional methods for heavy metal removal from aqueous solutions.