Super-performance photothermal conversion of 3D macrostructure graphene-CuFeSe₂ aerogel contributes to durable and fast clean-up of highly viscous crude oil in seawater

Collecting, cleaning and recycling oil from oil spills, especially highly viscous crude oil, are global challenges. Inspired by the solar energy-motivated viscosity-break, a 3D macrostructure CuFeSe₂-loaded graphene aerogel (GA-CuFeSe₂) is synthesized and exhibits a superior photothermal conversion capacity compared with other materials. GA-CuFeSe₂ presents a strong optical absorbance (e.g. 24.94 Lg^-1 cm⁻¹ under 808 nm irradiation) and a high photothermal conversion efficiency (e.g. 79.62% under 532 nm). GA-CuFeSe₂ heats the crude oil to approximately 100 °C within 10 s, and the absorption capacity is 18.63 g/g. The saturation diffusion time of crude oil into GA-CuFeSe₂ is less than 300 s. The 3D macrostructures supported by graphene provide a versatile pore structure for the quick diffusion of high-viscosity fluids and a high corrosion resistance. The high-performance photothermal conversion and oil sorption, driven by solar power, highlight the practical use of this material for oil spills. © 2020 Elsevier Ltd.