PDA改性PVDF/PAN纤维膜的制备及其油水分离性能研究

Preparation of PDA-modified PVDF/PAN fiber membrane and its oil-water separation performance

采用静电纺丝技术制备聚偏氟乙烯(PVDF)/聚丙烯腈(PAN)纤维膜,通过控制多巴胺(DA)浓度自聚合形成聚多巴胺(PDA)纳米簇,并将其沉积在PVDF/PAN纤维膜表面,得到PDA@PVDF/PAN纤维膜。通过扫描电子显微镜、傅里叶变换红外光谱仪、接触角分析仪等对PDA@PVDF/PAN纤维膜进行表征并测试了其油水分离性能。结果表明,PDA负载到PVDF/PAN纤维膜表面,与未改性纤维膜相比,PDA@PVDF/PAN纤维膜接触角减小了102.8°,对菜籽油/水混合物的分离效率均在97%以上,经过6次循环后,分离效率未发生显著变化,对石油醚/水乳液的过滤效率高达96.6%,表现出优异的过滤效率和耐久性能。

Polyvinylidene fluoride(PVDF)/polyacrylonitrile(PAN)fiber membrane was prepared by electrospinning technology.Polydopamine(PDA)nanoclusters were formed by self-polymerization under the control of dopamine concentration,and deposited on the PVDF/PAN fiber membrane surface to prepare PDA@PVDF/PAN fiber membrane.The PDA@PVDF/PAN fiber membrane was characterized by scanning electron microscope,Fourier transform infrared spectrometer and contact angle analyzer,and its oil-water separation performance was tested.The results showed that PDA was loaded on the PVDF/PAN fiber membrane surface.Compared with the unmodified fiber membrane,the contact angle of PDA@PVDF/PAN fiber membrane was reduced by 102.8°,and the separation efficiency of rapeseed oil/water mixture was above 97%.After 6 cycles,the separation efficiency did not change significantly,and the filtration efficiency of petroleum ether/water emulsion was as high as 96.6%,showing excellent filtration efficiency and durability.