Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environment and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environment and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
J Colloid Interface Sci. 2017 Nov 1;505:642-652. doi: 10.1016/j.jcis.2017.06.067. Epub 2017 Jun 20.
In this work, an iron-tannin-framework (ITF) complex was introduced to a poly (ether sulfone) (PES) casting solution as a hydrophilic additive to fabricate ITF/PES ultrafiltration (UF) membranes via non-solvent-induced phase separation (NIPS). The structure and performance of the PES membranes with ITF concentrations ranging from 0 to 0.9wt.% were systematically investigated by scanning electron microscopy, water contact angle, permeability, protein rejection and fouling resistance measurements. The results indicate that the pore structure and surface properties of PES UF membranes can be regulated by incorporating the ITF complex. Compared with classical PES membranes, ITF/PES membranes were found to have an increased hydrophilicity and porosity and reduced surface pore size. Importantly, a simultaneous enhancement of permeability and separation performance was observed for the blend membranes, which indicates that the introduction of the ITF complex can break through the trade-off between permeability and selectivity of UF membranes.When the ITF content was 0.3wt.%, the permeability reached a maximum of 319.4(L/mh) at 0.1MPa, which is 1.6 times higher than that of the classical PES membrane. Furthermore, the BSA rejection increased from 25.9% for the PES membrane to 95.9% for the enhanced membrane. In addition, the same membrane showed an improved fouling resistance (higher flux recovery and lower adhesion force) and stable hydrophilicity (unchanged after incubation in deionized water for 30days). The simple, green and cost-effective preparation process and the outstanding filtration performance highlight the potential of ITF/PES membranes for practical applications.
在这项工作中，将一种铁单宁框架（ITF）复合物引入聚醚砜（PES）铸膜液中，作为亲水性添加剂，通过非溶剂致相分离（NIPS）法制备 ITF/PES 超滤（UF）膜。通过扫描电子显微镜、水接触角、渗透性能、蛋白质截留率和抗污染性能测试，系统研究了 ITF 浓度为 0 至 0.9wt.%的 PES 膜的结构和性能。结果表明，通过加入 ITF 复合物可以调节 PES UF 膜的孔结构和表面性能。与经典 PES 膜相比，ITF/PES 膜具有更高的亲水性和孔隙率，以及更小的表面孔径。重要的是，共混膜的渗透性能和分离性能得到了同时提高，这表明引入 ITF 复合物可以突破 UF 膜渗透性能和选择性之间的权衡。当 ITF 含量为 0.3wt.%时，在 0.1MPa 下的渗透通量达到了 319.4(L/mh)的最大值，是经典 PES 膜的 1.6 倍。此外，BSA 的截留率从 PES 膜的 25.9%提高到增强膜的 95.9%。此外，相同的膜表现出改善的抗污染性（通量恢复率更高，附着力更低）和稳定的亲水性（在去离子水中孵育 30 天后没有变化）。简单、绿色且经济高效的制备工艺和出色的过滤性能突出了 ITF/PES 膜在实际应用中的潜力。
