磁驱动超疏水海绵制备及油水分离性能

Preparation of a Magnetically Driven Superhydrophobic Sponge for Oil and Water Separation

采用浸渍法,以纳米Fe_3O_4和硬脂酸对聚氨酯海绵进行了表面改性,制备了磁驱动超疏水海绵,并对其进行了XRD、FTIR、TG、接触角测试。结果显示:改性后的海绵水接触角高达158?,热稳定性较原始海绵明显提高,弹性性能未遭到破坏,置于高温(热水50～90℃,热空气80～120℃)、强腐蚀溶液(pH=2～13)的苛刻条件下24 h后,水接触角仍然高于148?。将改性后的海绵用于油/水混合物的分离中,表现出了优异的分离能力,且可通过磁铁进行磁驱动和磁回收。

In this study, the surface of polyurethane sponge was modified by impregnation method with Fe3O4 nanoparticles and stearic acid to prepare a magnetically driven superhydrophobic sponge. The sample was characterized by XRD, FTIR, TG and contact angle measurement techniques. The results showed that the water contact angle of the as-prepared sponge was up to 158? and the thermal stability was obviously higher than that the pristine sponge. The sample exhibited excellent elastic performance. Moreover, after the prepared sponge was placed under severe conditions, such as high temperature(hot water 50~90 ℃ and hot air 80~120 ℃) and strong corrosive solution(pH= 2~13) for 24 h, its water contact angle was still more than 148?. The as-prepared sponge showed excellent separation capacities for oil and water mixtures, and it could be driven and recycled simply by magnets.