Although electrospun nanofiber membranes (ENMs) are attractive for membrane distillation (MD), the desalination performance needs further improvement for practical applications. In this work, aluminium fumarate (AlFu) metal organic frameworks (MOFs) were incorporated into polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) nanofiber membranes via electrospinning to obtain substantial performance improvement. The results showed that the fluxes of the composite ENMs were increased by 60% and 114% when adding 0.1 and 2 wt% of AlFu MOF, respectively, compared to the pristine PVDF-HFP ENM. The systematic characterization proved that, the mean pore sizes of the composite ENMs were enlarged due to the unique bead-on-string structures, which was the key factor for flux enhancement demonstrated by theoretical calculation. The improved thermal efficiency in DCMD process due to the low thermal-conductivity of AlFu MOF also helps to increase permeate flux. Other factors such as increased surface roughness and additional nanochannels for water vapors were also considered helpful in flux enhancement. The optimum membrane (2 wt% AlFu MOF) showed stable desalination performance during a 46-h DCMD test using seawater as feed, demonstrating the durability and robustness of the composite ENMs. The present study confirms the positive role of MOFs for performance enhancement of ENMs in DCMD application, showing great potential in seawater desalination.

尽管电纺纳米纤维膜（ENMs）对膜蒸馏（MD）很有吸引力，但实际应用中的脱盐性能需要进一步提高。在这项工作中，富马酸盐铝（AlFu）金属有机骨架（MOF）掺入到聚偏二氟乙烯-共-六氟丙烯（PVDF-HFP）纳米纤维膜通过静电纺丝以获得显着的性能改进。结果表明，与原始 PVDF-HFP ENM 相比，当添加 0.1 和 2 wt% 的 AlFu MOF 时，复合 ENM 的通量分别增加了 60% 和 114%。系统表征证明，由于独特的串珠结构，复合ENMs的平均孔径增大，这是理论计算证明通量增强的关键因素。由于 AlFu MOF 的低导热性，DCMD 工艺中热效率的提高也有助于提高渗透通量。其他因素，例如增加的表面粗糙度和额外的水蒸气纳米通道也被认为有助于提高通量。最佳膜（2 wt% AlFu MOF）在使用海水作为进料的 46 小时 DCMD 测试中表现出稳定的脱盐性能，证明了复合 ENM 的耐用性和稳健性。本研究证实了 MOFs 对 ENMs 在 DCMD 应用中的性能增强的积极作用，在海水淡化中显示出巨大的潜力。