Development of Functional Porous Membrane Prepared by Radiation-Induced

通过选择接枝聚合溶剂和随后的化学改性，提出了在不降低水通量的情况下将高密度亚氨基二乙酸酯（IDA）基团引入聚乙烯微滤膜的方法。甲基丙烯酸缩水甘油酯（GMA）在甲醇溶剂中接枝到多孔中空纤维上，增强了基体的膨胀，从而弥补了孔体积的减少。随后，二甲亚砜(DMSO)/水溶剂使生成的环氧化物基团更高地转化为IDA基团。所得到的含ida基团中空纤维具有足够的钴结合能力，并将水通量维持在可行的水平。GMA接枝率为197%的螯合中空纤维的通量保持在70%左右，为起始中空纤维的2.0m^3/(m^2h)。空心纤维的钴饱和容量为1.9mol/kg。当含钴溶液通过其孔隙渗透到螯合中空纤维上时，观察到钴离子的急剧突破曲线。将甲基丙烯酸缩水甘油酯接枝到微滤中空纤维膜上。随后，生成的环氧化物基团转化为亚氨基二乙酸酯（IDA）基团。钴溶液通过亚微米孔径的孔渗透到螯合多孔膜上。所得的突破曲线证明了渗透过程中钴离子的有效去除。此外，通过x射线微量分析（XMA）确定了膜上钴吸附量的分布，作为流出量的函数。突破曲线的形状不依赖于液体停留时间，与吸附钴相对应的XMA线轮廓的规律传播表明，总体吸附速率不受钴离子对螯合多孔膜IDA基团的扩散阻力的控制。

A method by which to introduce a high-density iminodiacetate (IDA) group into a polyethylene microfiltration membrane without lowering the water flux was developed by selecting the solvents for graft polymerization and subsequent chemical modification. Grafting of glycidyl methacrylate (GMA) onto the porous hollow fiber in a methanol solvent enhanced the swelling of the matrix and thus compensated for the decrease in pore volume. Subsequently, the dimethyl sulfoxide (DMSO)/water solvent provided a higher conversion of the produced epoxide group into the IDA group. The resulting IDA-group-containing hollow fiber had a sufficient cobalt-binding capacity and maintained the water flux at a feasible level. The flux of the chelating hollow fiber, whose degree of GMA grafting was 197%, was kept at about 70%,i.e.,2.0m^3/(m^2h) of that of the starting hollow fiber. The cobalt saturation capacity of the hollow fiber was 1.9mol/kg. When a cobalt-containing solution permeated across the chelating hollow fiber through its pores, a sharp breakthrough curve of the cobalt ion was observed.Glycidyl methacrylate was grafted onto a microfiltration hollow-fiber membrane. Subsequently, the produced epoxide group was converted into an iminodiacetate (IDA) group. The cobalt solution was permeated across the chelating porous membrane through the submicron-diameter pores. The efficient removal of cobalt ion during permeation was demonstrated by the resulting breakthrough curve. Furthermore, the profile of the amount of cobalt sorbed across the membrane was determined as a function of the effluent volume by X-ray microanalysis (XMA). The shape of the breakthrough curves was not dependent on the liquid residence time, and the regular propagation of the XMA line profile equivalent to that of sorbed cobalt demonstrated that the overall sorption rate was not governed by the diffusional resistance of cobalt ion to the IDA group of the chelating porous membrane.