Evaluation of Modified Isobutylene-isoprene Rubber Cryogels as Sorbents for Oil Removal

摘要

Two new kinds of modified isobutylene-isoprene rubber (ITR) oil absorbers were successfully prepared via freeze-thaw method. In order to further improve UR oil-sorbents performance, graphite and nano-silica were chosen as modifiers. The cryogels were prepared cross-linking of IIR containing modifier in benzene at -5 °C, using sulfur monochloride as crosslinker. The modified UR structures were characterized by using scanning electron microscopy (SEM) and contact angle analysis (CA). The results show that graphite-modified ITR exhibit much higher uptake capacity than silica-modified. The sorption capacity of the best graphite-modified sample reaches 19.68 g.g~(-1) for crude oil, 19.98 g.g~(-1) for diesel and 19.50 g.g~(-1) for lubricating oil, respectively. The adsorbed liquids can be removed by centrifuging and the recovered materials could also be used more than 30 cycles. This study demonstrated graphite-modified UR are more excellent and recommendable materials for oil removal.