Nanofoaming of Polyamide Desalination Membranes To Tune Permeability and Selectivity,Environmental Science & Technology Letters

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Nanofoaming of Polyamide Desalination Membranes To Tune Permeability and Selectivity
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2018-02-05 00:00:00 , DOI: 10.1021/acs.estlett.8b00016
Xiao-Hua Ma _{1,

2} , Zhi-Kan Yao ₂ , Zhe Yang ₂ , Hao Guo ₂ , Zhen-Liang Xu ₁ , Chuyang Y. Tang ₂ , Menachem Elimelech ₃

Affiliation

Recent studies have documented the existence of discrete voids in the thin polyamide selective layer of composite reverse osmosis membranes. Here we present compelling evidence that these nanovoids are formed by nanosized gas bubbles generated during the interfacial polymerization process. Different strategies were used to enhance or eliminate these nanobubbles in the thin polyamide film layer to tune its morphology and separation properties. Nanobubbles can endow the membrane with a foamed structure within the polyamide rejection layer that is approximately 100 nm in thickness. Simple nanofoaming methods, such as bicarbonate addition and ultrasound application, can result in a remarkable improvement in both membrane water permeability and salt rejection, thus overcoming the long-standing permeability–selectivity trade-off of desalination membranes.

中文翻译：

聚酰胺脱盐膜的纳米发泡以调节渗透性和选择性

最近的研究表明，复合反渗透膜的聚酰胺薄选择层中存在离散的空隙。在这里，我们提供令人信服的证据，表明这些纳米空隙是由界面聚合过程中产生的纳米级气泡形成的。使用不同的策略来增强或消除聚酰胺薄膜薄膜中的这些纳米气泡，以调整其形态和分离性能。纳米气泡可以使膜在聚酰胺排斥层内具有约100 nm厚度的泡沫结构。简单的纳米发泡方法（例如添加碳酸氢盐和施加超声波）可以显着改善膜的透水性和除盐能力，

更新日期：2018-02-06

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