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Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

机译：直接接触式膜蒸馏的PTFE膜通量性能增强

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This work focused on enhancing the flux on hydrophobic polymeric membranes aimed for direct contact membrane distillation desalination (DCMD) process without compromising salt rejection efficiency. Successful coating of commercial porous poly-tetrafluoroethylene membranes with poly(vinyl alcohol) (PVA) was achieved by solution dipping followed by a cross-linking step. The modified membranes were evaluated for their performance in DCMD, in terms of water flux and salt rejection. A series of different PVA concentration dipping solutions were used, and the results indicated that there was an optimum concentration after which the membranes became hydrophilic and unsuitable for use in membrane distillation. Best performing membranes were achieved under the specific experimental conditions, water flux 12.2 L·m ·h [LMH] with a salt rejection of 99.9%. Compared to the pristine membrane, the flux was enhanced by a factor of 2.7. The results seemed to indicate that introducing hydrophilic characteristics in a certain amount to a hydrophobic membrane could significantly enhance the membrane distillation (MD) performance without compromising salt rejection.
机译：这项工作的重点是提高疏水性聚合物膜的通量，该膜旨在用于直接接触膜蒸馏脱盐（DCMD）工艺，而不会影响除盐效率。通过溶液浸渍，然后进行交联步骤，成功地用聚乙烯醇（PVA）涂布了商用多孔聚四氟乙烯多孔膜。根据水通量和脱盐率评估了改性膜在DCMD中的性能。使用了一系列不同的PVA浓度浸渍溶液，结果表明存在一个最佳浓度，此后膜变得亲水并且不适合用于膜蒸馏。在特定的实验条件下，水通量为12.2 L·m·h [LMH]，除盐率为99.9％，可获得最佳性能的膜。与原始膜相比，通量提高了2.7倍。结果似乎表明，在疏水膜上引入一定量的亲水特性可以显着提高膜蒸馏（MD）性能，而不会损害盐的截留率。

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