In this work, the simple fabrication of a new superhydrophobic magnetic sponge based
on CNTs, NiFe2O4 nanoparticles, and PDMS was investigated. CNTs were synthesized by chemical
vapor deposition (CVD) on a nickel ferrite catalyst supported on aluminum oxide (NiFe2O4/Al2O3).
The synthesis of nickel ferrite (NiFe) was accomplished using the sol–gel method, yielding magnetic
nanoparticles (43 Am2kg−1, coercivity of 93 Oe, 21–29 nm). A new superhydrophobic magnetic
PU/CNT/NiFe2O4/PDMS sponge was fabricated using a polyurethane (PU) sponge, CNTs, NiFe2O4
nanoparticles, and polydimethylsiloxane (PDMS) through the immersion coating method. The
new PU/CNT/NiFe2O4/PDMS sponge exhibits excellent superhydrophobic/oleophilic/mechanical
properties and water repellency (water absorption rate of 0.4%) while having good absorption of
oil, olive oil, and organic liquids of different densities (absorption capacity of 21.38 to 44.83 g/g),
excellent separation efficiency (up to 99.81%), the ability to be reused for removing oil and organic
solvents for more than 10 cycles, and easy control and separation from water using a magnet.
The new PU/CNT/NiFe2O4/PDMS sponge is a promising candidate as a reusable sorbent for
collecting oil and organic pollutants and can also be used as a hydrophobic filter due to its excellent
mechanical properties.
