SiO2-PEI/HBPA纳滤膜的制备及对Co（II）、Sr（II）的分离机制研究

通过5-异氰酸酯-异肽酰氯、端胺基-超支化聚酰胺、聚乙烯亚胺改性的纳米二氧化硅在聚丙烯腈超滤膜表面发生界面聚合构建纳滤膜。采用场致发射扫描电子显微镜（SEM）、表面电位仪、X射线光电子能谱分析（XPS）、原子吸收分光光度计、表面接触角测定仪、膜评价仪等手段揭示膜结构对分离放射性Co(II)、Sr(II)的稳定同位素的影响；明晰纳滤膜对Co(II)、Sr(II)的吸附机制、影响因素及与纳滤性能之间的内在联系；分析纳滤膜的耐氯性及膜吸附对耐氯性的影响。本项目的开展有利于深入理解离子吸附与纳滤性能之间的内在联系；为准确预测纳滤分离效果、指导纳滤膜结构的优化及应用奠定良好的基础；为放射性核素分离提供新的思路与途径；具有十分重要的理论意义与应用价值。

A series of nanofiltration membranes will be prepared by interfacial polymerization of 5-isocyanato-isophthaloyl chloride with amino-terminated hyperbranched polyamide and polyethyleneimine modified SiO2 on the polyacrylonitrile ultrafiltration membranes. The dependence of membrane structure on the separation of stable isotopes of radioactive Co(II) and Sr(II) will be investigated by SEM, Zeta potential measurement，X-Ray photoelectron spectroscopy (XPS)，atomic absorption spectrophotometer，surface contact angle measurement and the nanofiltration evaluation cell. The adsorption mechanism of Co(II) and Sr(II) on the nanofiltration membranes and the correlation between the adsorption and nanofiltration will be disclosed. In addition, the chlorine resistant of the nanofiltration membrane and effect of membrane adsorption on the chlorine resistant will also be investigated. The knowledge of the correlation between the membrane adsorption and the nanofiltration can be enriched and the nanofiltration performance can be predicted more exactly by carrying out this item. Based on the results obtained from this work, the membrane structure can be optimized more accurately and which would promote the application of the nanofiltration membrane. Meanwhile, it would provide new method for the removal of radioactive elements in the wastewater. In a word, the works of this item have very important theoretical meaning and application values.