[BMIM][PF_(6)]改性Janus微粒接枝PAN纤维膜的制备及其吸油性能研究

Preparation and oil absorption performance of[BMIM][PF_(6)]modified Janus particle grafted PAN fiber membrane

在碱性条件下,利用正辛醇与聚丙烯腈(PAN)纤维膜发生醇解反应,制得正辛醇改性PAN(C_(8)-PAN)纤维膜,然后将一端带六氟磷酸根阴离子(PF_(6)^(-))、另一端带氨基(NH_(2))基团的雪人状Janus微粒接枝到C_(8)-PAN纤维膜上,制得PF_(6)^(-)离子液体([BMIM][PF_(6)])改性Janus微粒接枝改性PAN纤维膜,研究了改性PAN纤维膜的疏水性能、吸油性能,并对其重复使用性能进行了评价。结果表明:制备的改性PAN纤维膜比表面积为9.95 m^(2)/g,平均孔径为3.414 nm,孔体积为0.050 m^(3)/g,水接触角为142.1°,与PAN纤维膜相比,均明显提高;改性PAN纤维膜对大豆油、润滑油、煤油的吸附速率均较高,5 min内即可达到吸附平衡,平衡吸附倍率分别为22.11、28.06与16.02 g/g,符合准二级吸附动力学方程模型;模拟实际使用环境,在搅拌转速为60 r/min,温度为10℃,盐度为4%的吸油环境下,改性PAN纤维膜对煤油的吸附倍率达到15 g/g;重复使用6次,改性PAN纤维膜仍能保持初始吸附倍率的90%以上。

n-octanol modified polyacrylonitrile fiber membrane(C_(8)-PAN)was prepared by alcoholysis reaction of n-octanol and PAN fiber membrane under alkaline condition.The snowman like Janus particles with hexafluorophosphate anion(PF_(6)^(-))at one end and amino(NH_(2))group at the other end were grafted onto C_(8)-PAN fiber membrane to prepare PF_(6)^(-) ionic liquid([BMIM][PF_(6)])modified Janus particle grafted PAN fiber membrane.The hydrophobic and oil absorption properties of the modified PAN fiber membrane were studied,and its reusability was evaluated.The results showed that the specific surface area of the modified PAN fiber membrane was 9.95 m^(2)/g,the average pore diameter was 3.414 nm,the pore volume was 0.050 m^(3)/g,and the water contact angle was 142.1°,which all significantly higher than those of PAN fiber membrane;the adsorption rate of the modified PAN fiber membrane was high for soybean oil,lubricating oil and kerosene,and the adsorption equilibrium could be achieved within 5 min,the equilibrium adsorption rates were 22.11,28.06,16.02 g/g respectively,which accorded with the quasi second-order adsorption kinetic equation model;the modified PAN fiber membrane can adsorb kerosene at a rate of 15 g/g in a simulated oil absorption environment of stirring speed of 60 r/min,temperature 10℃and salinity 4%;and the modified PAN fiber membrane can still maintain more than 90%of the initial adsorption rate after repeated use for 6 times.