Superhydrophobic Nanodiamond-Functionalized Melamine Sponge for Oil/Water Separation

Area of Science:

• Materials Science
• Environmental Science
• Nanotechnology

Background:

• Effective oil/water separation is crucial for environmental protection, particularly for oil spill remediation and organic pollutant removal.
• Nanomaterials offer unique properties for developing advanced absorbent materials.

Purpose of the Study:

• To fabricate a superhydrophobic sponge with hierarchical microstructures for efficient oil/water separation.
• To functionalize nanodiamonds (NDs) and embed them into a melamine sponge (MS) skeleton.

Main Methods:

• Covalent modification of nanodiamonds with octadecylamine (ODA).
• Fabrication of the superhydrophobic sponge (ND-ODA@PDMS@MS) via an immersion-drying process.
• Characterization of superhydrophobic properties and oil absorption/separation efficiency.

Main Results:

• The fabricated sponge (ND-ODA@PDMS@MS) exhibited superhydrophobic properties (water contact angle of 155 ± 2°).
• Achieved excellent absorption capacity (26.65-55.64 g/g) and oil/water separation efficiency (above 98.6%) for various oils and solvents.
• Demonstrated stable adsorption capacity in acidic, alkaline, and saline conditions, and effective continuous separation performance.

Conclusions:

• The study presents a facile strategy for producing robust and efficient absorbent materials for large-scale oil/water separation.
• The developed superhydrophobic sponge is a promising candidate for industrial oily sewage treatment and marine oil spill clean-up.