Thin-Film Nanocomposite (TFN) Membranes Incorporated with Super-Hydrophilic Metal- Organic Framework (MOF) UiO-66: Toward Enhancement of Water Flux and Salt Rejection
Thin-Film Nanocomposite (TFN) Membranes Incorporated with Super-Hydrophilic Metal- Organic Framework (MOF) UiO-66: Toward Enhancement of Water Flux and Salt Rejection
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DOI：
10.1021/acsami.6b14223
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发表时间：
2017-03-01
影响因子：
9.5
通讯作者：
Chen, Shing Bor
中科院分区：
文献类型：
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作者：
Ma, Dangchen;Peh, Shing Bo;Chen, Shing Bor
成功地合成了锆(IV)-羧酸盐金属有机骨架（MOP） UiO-66纳米颗粒，并将其掺入聚酰胺（PA）选择层中制备了新型薄膜纳米复合材料（TFN）膜。与未经改性的纯聚酰胺薄膜复合膜（TFC）相比，UiO-66纳米颗粒的掺入显著改变了膜的形态和化学性质，由于UiO-66颗粒的分子筛分和超亲水性，其固有的分离性能得到了改善。性能最好的TFN-U2 （0.1 wt %的颗粒负载）膜不仅透水性提高了52%，而且还保持了与基准相似的阻盐水平（接近95%）。研究了UiO-66对正向渗透（FO）性能的影响。在PRO和FO模式下，加入0.1 wt %的UiO-66的水通量比TFC控制下的最大水通量增加了40%和25%，当用1 M NaCl作为去离子水进料的抽提液时。同时，溶质反通量维持在较低水平。此外，TFN-U2膜的FO水通量随NaCl浓度的增加呈相对线性增加，NaCl浓度达到2.0 M，表明其内部浓度极化效应略有减弱。据我们所知，目前的研究是第一次考虑在TFN-FO膜上实现zr - mof （UiO-66）。
Zirconiumv (IV)-carboxylate metal organic framework (MOP) UiO-66 nanoparticles were successfully synthesized and incorporated in the polyamide (PA) selective layer to fabricate novel thin-film nanocomposite (TFN) membranes. Compared to unmodified pure polyamide thin-film composite (TFC) membranes, the incorporation of UiO-66 nanoparticles significantly changes the membrane morphology and chemistry, leading to an improvement of intrinsic separation properties due to the molecular sieving and superhydrophilic nature of UiO-66 particles. The best performing TFN-U2 (0.1 wt % particle loading) membrane not only shows a 52% increase of water permeability but also maintains salt rejection levels (similar to 95%) similar to the benchmark. The effects of UiO-66 loading on the forward osmosis (FO) performance were also investigated. Incorporation of 0.1 wt % UiO-66 produced a maximum water flux increase of 40% and 25% over the TFC control under PRO and FO modes, when 1 M NaCl was used as the draw solution against deionized water feed. Meanwhile, solute reverse flux was maintained at a relatively low level. In addition, TFN-U2 membrane displayed a relatively linear increase in FO water flux with increasing NaCl concentration up to 2.0 M, suggesting a slightly reduced internal concentration polarization effect. To our best knowledge, the current study is the first to consider implementation of Zr-MOFs (UiO-66) onto TFN-FO membranes.