木棉/ZIF-8整体型吸油材料的可控制备与性能研究

Controllable preparation and high-performance of kapok/ZIF-8 monolithic oil adsorbing materials

疏水型沸石咪唑类骨架材料[如沸石咪唑酯骨架材料-8(zeolitic imidazolate framework-8,ZIF-8)]的纳米属性使其难以重复利用,这限制了其在含油污水处理领域中的推广。选用廉价木棉为载体,将ZIF-8原位生长于木棉表面,通过调控ZIF-8在形成过程中的单体浓度,制备了木棉/ZIF-8整体型吸油材料。利用扫描电子显微镜(scanning electron microscope,SEM)、能谱仪(energy dispersive spectrometer,EDS)、X射线粉末衍射仪(X-ray Powder diffractometer,XRD)、水接触角(water contact angle,CA)和傅里叶变换红外光谱(Fourier transform infrared spectroscopy,FTIR)等手段对该整体型吸油材料的物理结构和化学组成进行了系统的分析与表征,证明了ZIF-8晶体在木棉表层上成功负载。该吸油材料保持了木棉的整体型和多孔属性,同时具备了ZIF-8的疏水特性,其吸油性能明显高于纯ZIF-8。有机溶剂或油品最大吸附量达119.7g/g。此外,该整体型吸油材料还表现出良好的循环稳定性,可循环使用50次以上。

The nanoscale feature of hydrophobic zeolitic imidazolate frameworks,such as zeolitic imidazolate framework-8(ZIF-8),make it difficult to recycle,which commonly inhibited their potential application of treating oil spills and organic discharges.In this study,ZIF-8 was in situ formed on the surface of cheap kapok.By controlling the monomer concentration during the formation of ZIF-8,the kapok/ZIF-8 integral oil-absorbing material was prepared.The physical structures and chemical compositions of Kapok/ZIF-8 were systematically analyzed and characterized by scanning electron microscope(SEM),energy dispersive spectrometer(EDS),X-ray Powder diffractometer(XRD),water contact angle(CA)and Fourier transform infrared spectroscopy(FTIR),which indicated the successful immobilization of ZIF-8 on the surface of kapok.The oil-absorbing material maintains the monolithic feature and porous properties of kapok,and has the hydrophobic property of ZIF-8,and its oil absorption capacity is significantly higher than that of ZIF-8.The maximum adsorption capacity could reach 119.7 g/g.In addition,kapok/ZIF-8 exhibited good recycling ability,which could be recycled for more than 50 times.