Fluorine-Functionalized Covalent Organic Framework Superhydrophobic Modified Melamine Sponge for Efficient oil-water...

Area of Science:

• Materials Science
• Environmental Science
• Nanotechnology

Background:

• Hydrophobic sponges are crucial for oil spill cleanup and oil-water separation due to their absorption and selectivity.
• Conventional sponges often lack the necessary superhydrophobicity and chemical stability for efficient and durable oil-water separation.

Purpose of the Study:

• To develop a novel superhydrophobic sponge material for efficient and selective oil-water separation.
• To enhance the performance and durability of sponges for environmental remediation applications.

Main Methods:

• Modification of hydrophilic melamine sponge (MS) with polydimethylsiloxane (PDMS).
• In situ growth of fluorine-functionalized covalent organic framework (TFA-COF) nanoparticles on the modified MS.
• Characterization of superhydrophobic properties, oil absorption capacity, and separation efficiency.

Main Results:

• The prepared PDMS@TFA-COF@MS sponge exhibited superhydrophobic properties with a water contact angle of 156.7°.
• Achieved high oil-water separation efficiency (96% after 30 cycles) and oil absorption capacity (12,646% after 30 cycles).
• Demonstrated excellent thermal stability, flame retardancy, and chemical resistance in acidic, alkaline, and salt solutions.

Conclusions:

• The superhydrophobic PDMS@TFA-COF@MS sponge is highly effective for oil-water separation, including surfactant-stabilized emulsions.
• The material's durability, selectivity, and resistance to harsh conditions suggest its potential for long-life environmental applications.