Tailoring the Morphology and Performance of Polyacrylonitrile Ultrafiltration Membranes for Produced Water Treatment via Solvent Mixture Strategy,Chemical Engineering & Technology

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Tailoring the Morphology and Performance of Polyacrylonitrile Ultrafiltration Membranes for Produced Water Treatment via Solvent Mixture Strategy
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2022-07-19 , DOI: 10.1002/ceat.202100638
Noushin Naderi ₁ , Seyed Saeid Hosseini _{1,

2} , Yomen Atassi ₃

Affiliation

The separation performance of membranes is highly dependent on their morphology and microstructure. The present study aims to tailor the characteristics of asymmetric polyacrylonitrile (PAN) ultrafiltration membranes by adopting a solvent mixture strategy, combining dimethylformamide (DMF) and N-methyl-2-pyrrolidone (NMP) for produced water treatment. The ternary phase diagram was used for better analysis of the microstructural changes from the thermodynamics point of view. Using a solvent mixture containing more DMF (i.e., 75 %) and increasing the PAN concentration in the dope were effective in improving the solution viscosity and promoting delayed demixing. As a result, finger-like macrovoids were suppressed to some extent and the internal morphology of the membranes was transformed into a sponge-like structure, accompanied by a reduction in the overall membrane porosity and mean pore size.

中文翻译：

通过溶剂混合策略定制用于采出水处理的聚丙烯腈超滤膜的形态和性能

膜的分离性能高度依赖于其形态和微观结构。本研究旨在通过采用溶剂混合策略，将二甲基甲酰胺 (DMF) 和N-methyl-2-pyrrolidone (NMP) 用于采出水处理。三元相图用于从热力学角度更好地分析微观结构变化。使用含有更多 DMF（即 75%）的溶剂混合物并增加涂料中的 PAN 浓度可有效提高溶液粘度并促进延迟分层。结果，指状大孔在一定程度上受到抑制，膜的内部形态转变为海绵状结构，伴随着整体膜孔隙率和平均孔径的减小。

更新日期：2022-07-19

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