Monolithic oil-absorbing polymers with magnetic responsiveness were prepared through solution radical polymerization combining with freeze-drying technology.A series of the polymer resins were first synthesized using different amount of 4-tert-butyl-styrene (
t
BS) and methyl methacrylate (MMA) in the presence of Fe
3
O
4
nanoparticles
which were modified by methacryloxy propyl trimethoxyl silane prior to the synthesis.Divinylbenzene (DVB) was used as cross linking agent and azodiisobutyronitrile as initiator in the polymerization carried out at 80℃ for 6 h.The obtained polymers were washed by ethanol/water several times and then freeze dried to obtain monolithic polymeric resins.The as-prepared monolithic polymers were characterized by Fourier transform infrared spectroscopy
X-ray diffraction
scanning electronic microscopy
optical microscope and contact angles of water droplet on the surface of polymers.Effects of molar ratio of MMA/
t
BS
DVB amount on the oil absorption capacities and absorption rate were investigated in detail.Oil-absorbing polymeric resins with optimized property were prepared by selecting MMA as 2 mL
t
BS as 2 mL and DVB as 0.5 mL.The polymeric resins are hydrophobic and oleophilic.They can absorb more than 10 times of their own weight for different organic solvents and oils
such as dimethylbenzene
dichloroethane
ethyl acetate
n
-hexane
cyclohexane
trichloromethane
engineering and crude oil.And the oil-saturated absorption can be achieved within 20 min.The polymeric resins can also effectively absorb organic solvents from the oil/water mixture and the polymers still float on the surface of water.The oil-saturated polymer resins can be easily separated and collected from the surface of water by applying an external magnet.Furthermore
after the treatment of the absorbed oil
the polymer resins can be reused for oil absorption.The monolithic polymers can be recycled more than 10 times without obvious damaged.These magnetic oil-absorbing polymeric resins are potential candidates for dealing with oil spills.
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