Switchgrass as oil and water-spill sorbent: Effect of particle size, torrefaction, and regeneration methods.Switchgrass, both raw and torrefied, was tested for its ability to sorb water or oil.  Torrefaction at 220 °C for 30 min reduces water sorption capacity by an average of 55% but does not have a statistically significant impact on oil sorption. 
torrefaction
The cyclic performance was also examined, utilizing centrifugal extraction as the regeneration method. 
centrifugal extraction