Clean Up and Recovery of Oil from Water Bodies Using Oil Sorbents with High Sorption Capacity, Oil/Water Selectivity and Reusability
To enhance the removal of oil contaminants from water, an oil spill clean-up sorbent was prepared by synthesizing
a lignin based polyurethane foam (LPU) and modified with graphene and 1H,1H,2H,2H-perfluorodecanethiol (PFD)
monomer (LPU-rGO-PFD). The LPU-rGO-PFD sorbent was fabricated by anchoring of reduced graphene oxide (rGO)
on the skeleton of a LPU foam using adhesive polydopamine, followed by functionalization with (PFD) monomer.
This resulted in the ability to tune the surface properties of the LPU sponge skeleton to superhydrophobic and
super-oleophilic, with a contact angle of 140.1°. The LPU-rGO-PFD sorbent was characterized with microscopic and
spectroscopic analyses, and it exhibited many outstanding features, including a high sorption capacity (up to 68.2
times its own weight), high selectivity to crude oil sorption, and excellent reusability in comparison to commercial
non-woven polypropylene sorbent. Furthermore, the oil sorption capacity remained the same after 20 cycles of oil
sorption-squeezing experiments and the absorbed crude oil could be removed and collected by a simple squeezing
process before reuse. As a result, LPU-rGO-PFD is considered as a promising oil sorbent for oil spill containment
removal and environmental protection.
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