Abstract
Sorption capacity and kinetics for heavy oils are reviewed on various carbon materials, exfoliated graphite, carbonized fir fibers, carbon fibers, carbon nanotube sponge, etc. Cycling performance of carbon sorbents in sorption and recovery are also reviewed. Exfoliated graphite and carbonized fir fibers with low bulk densities have high sorption capacity as 80 kg/kg, much higher capacity than conventional absorbents, such as polypropyrene nonwoven web and milkweed fibers. PAN-based carbon fibers have excellent cyclability for sorption/desorption by simple filtration under suction. It is possible to recover heavy oil from contaminated sand by exfoliated graphite.
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