Metal–Organic Frameworks Supported on Nanofiber for Desalination by Direct Contact Membrane Distillation,ACS Applied Materials & Interfaces

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Metal–Organic Frameworks Supported on Nanofiber for Desalination by Direct Contact Membrane Distillation
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-03-08 00:00:00 , DOI: 10.1021/acsami.8b01371
Fan Yang ₁ , Johnson E. Efome ₁ , Dipak Rana ₁ , Takeshi Matsuura ₁ , Christopher Lan ₁

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Among other applications, metal–organic frameworks (MOFs) are slowly gaining grounds as fillers for desalination composite membranes. In this study, superhydrophobic poly(vinylidene fluoride) nanofibrous membranes were fabricated with MOF (iron 1,3,5-benzenetricarboxylate) loading of up to 5 wt % via electrospinning on a nonwoven substrate. To improve the attachment of nanofibers onto the substrate, a substrate pretreatment method called “solvent basing” was employed. The iron content in the nanofiber, measured by energy-dispersive X-ray spectroscopy, increased proportionally with the increase of the MOF concentration in the spinning dope, indicating a uniform distribution of MOF in the nanofiber. The water contact angle increased up to 138.06 ± 2.18° upon the incorporation of 5 wt % MOF, and a liquid entry pressure of 82.73 kPa could be maintained, making the membrane useful for direct contact membrane distillation experiments. The membrane was stable for the entire operating period of 5 h, exhibiting 2.87 kg/m²·h of water vapor flux and 99.99% NaCl (35 g/L) rejection when the feed and permeate temperature were 48 and 16 °C, respectively. Immobilization of MOF on nanofibers with the enhanced attachment was proven by inductively coupled mass spectrometry analysis, by which no Fe²⁺ could be found in the permeate to the detection limit of ppt.

中文翻译：

纳米纤维支持的金属有机框架，可通过直接接触膜蒸馏进行脱盐处理

在其他应用中，金属有机骨架（MOF）逐渐成为脱盐复合膜的填料。在这项研究中，超疏水聚偏二氟乙烯纳米纤维膜是通过在非织造基材上静电纺丝制成的，其MOF（1,3,5-苯三羧酸铁）的负载量高达5％（重量）。为了改善纳米纤维在基材上的附着，采用了一种称为“溶剂基”的基材预处理方法。通过能量色散X射线光谱法测量，纳米纤维中的铁含量与纺丝原液中MOF浓度的增加成比例地增加，表明MOF在纳米纤维中的均匀分布。在加入5 wt％的MOF和82的液体进入压力后，水接触角增加到138.06±2.18°。可以保持73 kPa，使该膜可用于直接接触膜蒸馏实验。该膜在5小时的整个操作过程中均保持稳定，表现为2.87 kg / m当进料温度和渗透温度分别为48°C和16°C时，水蒸气通量为² ·h，除去99.99％NaCl（35 g / L）。通过感应耦合质谱分析法证明了MOF在纳米纤维上具有增强的附着力，从而在渗透物中未发现Fe ²⁺达到ppt的检出限。

更新日期：2018-03-08

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