Yang Jingling, Lin Geng-Sheng, Mou Chung-Yuan, Tung Kuo-Lun
Department of Chemistry , National Taiwan University , Taipei , Taiwan 10617.
School of Environment , Jinan University , Guangzhou , China 510632.
ACS Appl Mater Interfaces. 2020 Feb 12;12(6):7459-7465. doi: 10.1021/acsami.9b21042. Epub 2020 Feb 3.
We report on our use of a thin-layered vertical mesoporous silica thin film (MSTF) with tunable pore size overlaid on an anodic aluminum oxide (AAO) membrane for advancing water purification. The features of ultrathin thickness (about 20 nm), a uniform vertical pore orientation, low tortuosity, high porosity, and a hydrophilic surface endow the MSTF membranes with ultrahigh water permeability compared with that of state-of-the-art membranes. The modified E-MSTF membrane with a small pore diameter of 2.1 ± 0.1 nm demonstrates superior nanofiltration performance for dye molecules with a cutoff of 520 Da and ultrahigh water permeability of 310 ± 8 L m h bar. Furthermore, the precise molecular sieving of dye/salt mixtures was realized with outstanding salt permeation (97.5% NaCl, 96.0% NaSO) and a high retention of dye (99.0%). The water permeance and selectivity of the modified E-MSTF membrane are higher than that of reported membranes with similar dye rejections. This work opens up new avenues for constructing tailor-made membranes with tunable pore size and remarkable separation performance.
我们报道了在阳极氧化铝（AAO）膜上覆盖具有可调孔径的薄层垂直介孔二氧化硅薄膜（MSTF）以推进水净化的应用。超薄厚度（约20纳米）、均匀的垂直孔取向、低曲折度、高孔隙率和亲水表面等特性，使MSTF膜相比最先进的膜具有超高的水渗透性。孔径为2.1±0.1纳米的改性E-MSTF膜对截留分子量为520道尔顿的染料分子表现出优异的纳滤性能，水渗透率高达310±8升·米⁻²·小时⁻¹·巴⁻¹。此外，实现了对染料/盐混合物的精确分子筛分，具有出色的盐分透过率（氯化钠97.5%，硫酸钠96.0%）和高染料截留率（99.0%）。改性E-MSTF膜的透水率和选择性高于报道的具有类似染料截留率的膜。这项工作为构建具有可调孔径和卓越分离性能的定制膜开辟了新途径。
