高分子渗透汽化脱水膜一般采用具有刚性链且能与水形成离子-偶极作用或氢键的强亲水性高分子材料,存在渗透性和选择性互为制约的关系,即“Trade-off”效应。将无机纳米材料引入到聚合物中制备有机-无机渗透汽化复合膜是解决这一效应的有效途径之一。综述了碳纳米材料、纳米氧化物颗粒、纳米分子筛等在复合渗透汽化脱水膜领域的应用研究进展。这些纳米材料的填充,有助于提高复合膜的机械稳定性、亲水性、渗透选择性及渗透通量等。此外,对于高分子基体,要制得反“Trade-off”效应的渗透汽化有机-无机复合脱水膜,提出了填充剂需尽量满足对水分子具有选择性透过等4个条件。
Polymeric pervaporation membranes for dehydration were generally fabricated by strong hydrophilic polymer materials,which has a rigid chain and can form ion-dipole interaction or hydrogen bond.However,they are the mutual restraint relationship of permeability and selectivity between each other,which is named “Trade-off” effect.Inorganic nanomaterials were introduced into polymers to prepare organic-inorganic pervaporation nanocomposite membranes,which is one of the effective ways to solve this problem.The researches of nanocomposite pervaporation membranes for dehydration involving nanoparticles such as carbon nanoparticles,nano-oxide particles,nano-molecular sieve particles,etc.were summarized.The filling of these nanomaterials helped to improve the mechanical stability,hydrophilicity,selectivity and permeation flux of composite membranes significantly.In addition,four required conditions were proposed for the fillers to prepare the organic-inorganic nanocomposite pervaporation membranes with anti-“Trade-off” effect.
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基金资助
国家自然科学基金(21406082、21476094);江苏省自然科学基金(BK20171268);淮安市科技支撑项目(HAG201609);江苏省高校“青蓝工程”资助项目