Understanding mass transfer through asymmetric membranes during forward osmosis: A historical perspective and critical review on measuring structural parameter with semi-empirical models and characterization approaches
Understanding mass transfer through asymmetric membranes during forward osmosis: A historical perspective and critical review on measuring structural parameter with semi-empirical models and characterization approaches
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DOI：
10.1016/j.desal.2016.12.016
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发表时间：
2017-11-01
期刊：
影响因子：
9.9
通讯作者：
McCutcheon, Jeffrey R.
中科院分区：
文献类型：
--
作者：
Manickam, Seetha S.;McCutcheon, Jeffrey R.
由多孔层支撑的一体化或复合表层组成的不对称膜用于几种膜分离工艺，包括超滤、纳滤、反渗透和最近的正渗透（FO）。前三种是液压驱动技术，其中选择性和生产率性能主要由选择层决定，而支撑层仅提供机械支撑。在FO中，支撑层在决定性能方面起着关键作用。许多研究，其中许多是在过去的十年中，提出了模型，阐明了支持层的结构特性，最显着的孔隙率和弯曲度，对膜性能的FO的影响。这些性质形成了经常使用的“结构参数”S，其说明了膜对支撑层内溶质传质的结构阻力。然而，这些模型的不确定性和不准确性，导致了平行发展的分析方法来表征结构参数。这篇评论提供了一个历史的角度和背景下，这些模型和表征方法的演变，因为我们的理解，正向渗透的改善。两个半经验模型和表征方法的演变对正向渗透领域的整体影响进行了讨论。(C)2017 Elsevier B.V.版权所有。
Asymmetric membranes comprised of an integrated or composite skin layer supported by a porous layer are used in several membrane separation processes including ultrafiltration, nanofiltration, reverse osmosis, and, most recently, forward osmosis (FO). The first three are hydraulic pressure-driven technologies in which selectivity and productivity performance is determined primarily by the selective layer while the support layer only provides mechanical support. In FO, the support layer plays a critical role in determining performance. Numerous studies, many of them in the last decade, have proposed models that elucidate the influence of support layer structural properties, most notably porosity and tortuosity, on membrane performance in FO. These properties form the often used "structural parameter", S, which accounts for a membrane's structural resistance to solute mass transfer within the support layer. Uncertainty and inaccuracy of these models, however, has led to the parallel development of analytical approaches to characterizing the structural parameter. This review provides a historical perspective and context for the evolution of those models and characterization approaches as our understanding of forward osmosis has improved. The overall impacts of the evolution of both semi-empirical models and characterization approaches on the field of forward osmosis are discussed. (C) 2017 Elsevier B.V. All rights reserved.