孔隙可调的编织石墨烯过滤膜的制备及其在盐湖卤水离子分离领域的应用

Preparation of Woven Graphene Filter Membrane with Adjustable Pore Size and Its Application for Precise Separation of Ions from Salt Lake Brine

中文关键词:  盐湖卤水  编织石墨烯过滤膜  孔隙调节  离子分离

英文关键词:SaltLakebrine  Graphene-basedwovenfiltermembrane  Nanoporesregulation  Ionseparation

中文摘要:

      我国盐湖数量多、分布广、资源丰富。如何有效地从盐湖卤水中提取资源元素，对国民经济具有重要意义。然而目前的过滤膜仍然具有稳定性差、耐腐蚀性差、高离子截留率与高水通量不可兼得等短板，因此亟需寻找一种力学性能优异，过滤性好的新型膜材料；二维材料因其具有低能耗、高效率等特点，在筛选分离领域展现了巨大优势。通过将碳纳米管编织进过滤膜、化学修饰编织石墨烯带边缘、或纳米压痕技术处理编织过滤膜等方法可以调控过滤孔尺寸以实现离子筛分，这种编织过滤膜在保障孔隙率的同时，膜强度相比传统商业渗透膜提升至少两个数量级，因此该研究为利用纳米编织技术设计高通量高强度的过滤膜提供了新思路，并总结分析了基于编织石墨烯过滤膜用于盐湖卤水离子分离性能的研究情况。

英文摘要:

      TheSaltLakesinChinaarenumerous，widelydistributed，completeintypeandrichinresources. The significance of how to extract resource elements from Salt Lake brine more effectively to the national economy has become increasingly apparent. However，the current separation filter membrane still has the disadvantagesofpoorstability，poorcorrosionresistance，lowrejection rateandlow waterflux.Therefore， it is urgent to find a new membrane material with excellent mechanical properties and good filterability. In recent years，the two-dimensional materials have been widely concernedfor membrane separation methods because of its low energy consumption andhigh efficiency. In this paper，graphene ribbons are woven into filter membrane，which can achieve ion separation from Salt Lakes. The size of the filter hole can be regu-lated by braiding carbon nanotube into the filter membrane，or modifying the edge of graphene ribbons by chemicalfunctionsortreatedthefilterholeswithnanoindentationtechnology.Thisbraidedfiltermembrane has asignificantimprovementby atleasttwo orders of magnitude in strength accompaniedbyhighporosity comparedwiththetraditionalcommercialreverseosmosismembrane.Theresultsprovideanewideaforthe designofhighthroughputandhighstrengthnanofiltrationmembranesusingnanoweavingtechnology.