. Experimental
In this paper, similar experimental method reported by Fan et al. [19] was used. To investigate the oil adsorption
and reusing performances of the MWCNTs, about 0.2 g of MWCNTs was loaded to a 5ml injection syringe
(medical equipment), to accomplish the oil adsorption process. And removing of the adsorbed oil is realized through
pushing the top of the padding, with a gas pressure of 0.80MPa through a nitrogen gas cylinder or through burning
the MWCNTs at 240 oC. The oil sorption process of MWCNTs was designed as follows,
(1) 0.2 g MWCNTs were directly put into the injection syringe (5ml), then excess oil (gasoline, kerosene,
diesel oil No.1or diesel oil No.2) was added and kept for 2 h.
(2) The syringe was hanged for 2 h in order to drip off the excess oil. The recovery of adsorbed oil from
MWCNTs was carried out by squeezing the piston of syringe under the pressure of 0.80MPa until no oil dropped. At
this point, the oil remaining in the syringe may be considered as all adsorbed on the MWCNTs. The MWCNTs