多孔膜结构精细调控及高效油水分离
详细信息 查看官网全文
- 英文论文题名：Designing Polymer Membrane with Hierarchical Structure
- 论文作者：靳健
- 英文论文作者：Jian Jin ; Suzhou Institute of Nano-Tech and Nano-Bionics ; Chinese Academy of Sciences
- 年：2016
- 作者机构：中科院苏州纳米技术与纳米仿生研究所;
- 论文关键词：多孔膜 ; 乳液分离 ; 高通量 ; 结构调控 ; 纳米结构复合
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十二分会： 多孔功能材料
- 语种：中文
- 分类号：TQ051.893
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十二分会 ; 多孔功能材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：171k
- 原文格式：D
- 会议级别：全国
摘要
传统高分子分离膜由于成膜材料种类少、制备方法单一及制备过程的不可控性,较难对分离膜结构(如膜表面结构、孔道结构、有效孔径等)进行精细调控,使膜性能难以进一步提升。我们围绕高分子分离膜"膜结构精细调控"这一关键科学问题,从膜的多级物理结构和有效传输路径两个关键因素出发,构建了系列新型结构、高性能高分子及高分子基复合分离膜,显著提高了膜性能,在保障高精度的同时实现了高通量分离。基于良溶剂与不良溶剂相交换的相转化成膜是目前制备高分子分离膜的普适方法。但是,传统相转化获得的高分子分离膜表面相对平滑致密、孔隙率较低,而且受高分子材料自身的表面能性质限制,膜的浸润性较差,在分离过程中需要较高的跨膜压力(通常大于1 bar)来提高分离通量。我们通过在膜表面构筑多级物理结构(即微纳尺度的粗糙结构)来提升和稳定膜性能。多级物理结构一方面提高膜的孔隙率;另一方面增加溶剂与膜的有效接触面积,提升液体在膜表面和内部的浸润能力。在不改变传统高分子膜制备工艺的前提下,通过调控高分子成膜的相转化过程,在相转化成膜过程中引入非溶剂添加剂、改变高分子链的伸展状态,诱导高分子链缠结、团聚,形成聚集体,实现高分子膜多级物理结构的构筑,并利用表面化学性质的协同调控作用,有效提高了膜通量和抗污染性能。另一方面,通过降低膜分离的有效传输路径,构筑具有纳米尺寸厚度和孔径精细可调的高强度、大面积超薄多孔膜,突破了传统高分子分离膜中选择性和通量的性能限制,实现了高精度、超高通量乳液分离。
Wastewater containing emulsified oil/water mixture is generated in many industrial processes,separation of which is always a tough work and challenging.An inexpensive and broadly applicable approach towards designing materials for effective separation of various emulsions,especially surfactant-stabilized microemulsions is rather sparse and highly required.We present here a facile methodology to fabricate superwetting membranes with hierarchical structures for separation of various oil/water emulsions with high-flux.PVDF and PVDF derivative polymer membranes with micro/nano hierarchical structure on surface were fabricated by adjusting the phase inversion process during membrane preparation.The micro/nano hierarchical structure endows the membranes special wettability for water and oil,which could be used for fast separation of various oil-in-water and water-in-oil emulsions with both micrometer droplets and nanometer droplets solely driven by gravity.Our work provides a new route for designing superwetting materials for effective oil/water separation.
Wastewater containing emulsified oil/water mixture is generated in many industrial processes,separation of which is always a tough work and challenging.An inexpensive and broadly applicable approach towards designing materials for effective separation of various emulsions,especially surfactant-stabilized microemulsions is rather sparse and highly required.We present here a facile methodology to fabricate superwetting membranes with hierarchical structures for separation of various oil/water emulsions with high-flux.PVDF and PVDF derivative polymer membranes with micro/nano hierarchical structure on surface were fabricated by adjusting the phase inversion process during membrane preparation.The micro/nano hierarchical structure endows the membranes special wettability for water and oil,which could be used for fast separation of various oil-in-water and water-in-oil emulsions with both micrometer droplets and nanometer droplets solely driven by gravity.Our work provides a new route for designing superwetting materials for effective oil/water separation.
引文
[1]L.Hu,S.Gao,X.Ding,D.Wang,J.Jiang,J.Jin*,ACS Nano 2015,9,4835.
[2]W.Zhang,Y.Zhu,X.Liu,D.Wang,J.Li,L.Jiang,J.Jin*,Angew.Chem.Int.Ed.2014,53,856.
[3]W.Zhang,Z.Shi,F.Zhang,X.Liu,J.Jin*,L.Jiang,Adv.Mater.2013,25,2071.
[4]Z.Shi,W.Zhang,F.Zhang,X.Liu,D.Wang,J.Jin*,L.Jiang,Adv.Mater.2013,25,2422.
[5]F Zhang,W.Zhang,Z.Shi,D.Wang,J.Jin*,L.Jiang,Adv.Mater.2013,25,4192.
[2]W.Zhang,Y.Zhu,X.Liu,D.Wang,J.Li,L.Jiang,J.Jin*,Angew.Chem.Int.Ed.2014,53,856.
[3]W.Zhang,Z.Shi,F.Zhang,X.Liu,J.Jin*,L.Jiang,Adv.Mater.2013,25,2071.
[4]Z.Shi,W.Zhang,F.Zhang,X.Liu,D.Wang,J.Jin*,L.Jiang,Adv.Mater.2013,25,2422.
[5]F Zhang,W.Zhang,Z.Shi,D.Wang,J.Jin*,L.Jiang,Adv.Mater.2013,25,4192.