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Development of Functional Porous Membrane Prepared by Radiation-Induced

辐射诱导制备功能性多孔膜的研制

基本信息

批准号：
02555187
负责人：
FURUSAKI Shintaro
金额：
$ 4.29万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

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.

通过选择接枝聚合溶剂和随后的化学改性，开发了一种在不降低水通量的情况下将高密度亚氨基二乙酸（IDA）基团引入聚乙烯微滤膜的方法。在甲醇溶剂中将甲基丙烯酸缩水甘油酯（GMA）接枝到多孔中空纤维上增强了基质的溶胀，从而补偿了孔体积的减少。随后，二甲基亚砜（DMSO）/水溶剂使生成的环氧基团更高地转化为IDA基团。所得含IDA基团的中空纤维具有足够的钴结合能力并将水通量保持在可行的水平。 GMA接枝度为197%的螯合中空纤维的通量保持在起始中空纤维通量的70%左右，即2.0m^3/(m^2h)。中空纤维的钴饱和容量为1.9mol/kg。当含钴溶液通过螯合中空纤维的孔渗透时，观察到钴离子的尖锐突破曲线。将甲基丙烯酸缩水甘油酯接枝到微滤中空纤维膜上。随后，产生的环氧基团被转化为亚氨基二乙酸酯(IDA)基团。钴溶液通过亚微米直径的孔渗透穿过螯合多孔膜。所得到的穿透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) 确定了跨膜吸附的钴量随流出物体积的变化。突破曲线的形状不依赖于液体停留时间，并且XMA线轮廓的规则传播相当于吸附的钴的线轮廓，这表明总体吸附速率不受钴离子对螯合多孔膜的IDA基团的扩散阻力的控制。