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Recently, the team of Professor Yang Zhuohong, College of Materials and Energy of South China Agricultural University, and the team of Professor Li Yongtao of the College of Resources and Environment have made new progress
in the field of environmental remediation materials.
In recent years, the risk of oil spills and oily wastewater discharge has continued to increase, seriously affecting the sustainable development
of the ecological environment and marine economy.
Therefore, the development of economical, universal materials to effectively prevent the risk of oil spills, especially high-viscosity oily contaminants, is critical and challenging
.
In order to solve the above problems, researchers used the super adhesion characteristics, metal ion adsorption performance and photothermal effect of mussel biomimetic material polydopamine to construct a superhydrophobic magnetic porous sponge
with photomagnetothermal conversion ability and self-cleaning through dopamine self-polymerization deposition, polymer-assisted metal deposition and surface hydrophobic modification process.
The sponge exhibits fast oil adsorption behavior and good oil absorption capacity, and can adsorb oil compounds
with up to 50.
6 times its dry weight or more than 90% of its own volume.
Due to the deposition of the magnetic metal layer, the sponge can be moved to the designated contaminated area under the action of the external magnetic field for oil spill cleaning, and can achieve rapid adsorption
of high viscosity oil under the action of electromagnetic induction heater.
In addition, the sponge exhibits excellent durability and storage stability, and can be assembled into gravity-driven or pump-driven oil-water separation devices for effective cleaning
of oil contaminants of different densities.
More importantly, thanks to the excellent photothermal effect of polydopamine and the thermal conductivity of metals, the sponge can quickly heat up to about 60 °C under sunlight, thereby achieving rapid removal
of high viscosity oil spills on the water surface.
