State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Environ Sci (China). 2020 Dec;98:77-84. doi: 10.1016/j.jes.2020.04.010. Epub 2020 Jun 14.
A novel polyamide (PA) thin film nanocomposite (TFN) membrane modified with Beta (β) zeolite was prepared by interfacial polymerization on a poly (ether sulfone) (PES) ultrafiltration membrane. Compared with the PA thin film composite (TFC) membrane, the introduction of β zeolite with porous structure notably increased the water flux of TFN membrane. Because the β zeolite with tiny-sized and well-defined inner-porous acted as prior flow channels for water molecules and a barrier for the sulfate ions. The successful introduction of β zeolite into the (PA) selective layer and their dispersion in the corresponding layer were verified by scanning electron microscope (SEM) and atomic force microscopy (AFM). Water contact angle, zeta potential measurements were used to characterize the changes of membrane surface properties before and after incorporating the β zeolite. With the β zeolite introducing, the water contact angle of modified TFN membrane was decreased to 47.8°, which was benefited to improve the water flux. Meanwhile, the negative charges of the modified TFN membrane was increased, resulting in an enhancement of separation effect on SO and Cl. In term of nanofiltration (NF) experiments, the highest pure water flux of the TFN membranes reached up to 81.22 L m hr under operating pressure of 0.2 MPa, which was 2.5 times as much as the pristine TFC membrane.
采用界面聚合法在聚醚砜（PES）超滤膜上制备了一种新型的聚酰胺（PA）薄膜纳米复合（TFN）膜，并用β沸石进行了修饰。与 PA 薄膜复合（TFC）膜相比，具有多孔结构的β沸石的引入显著提高了 TFN 膜的水通量。由于具有小尺寸和明确定义的内孔的β沸石作为水分子的优先流道，并作为硫酸盐离子的屏障。扫描电子显微镜（SEM）和原子力显微镜（AFM）验证了β沸石成功引入（PA）选择性层及其在相应层中的分散。水接触角、Zeta 电位测量用于表征在引入β沸石前后膜表面性质的变化。随着β沸石的引入，改性 TFN 膜的水接触角降低至 47.8°，这有利于提高水通量。同时，改性 TFN 膜的负电荷增加，从而提高了对 SO 和 Cl 的分离效果。在纳滤（NF）实验中，在 0.2 MPa 的操作压力下，TFN 膜的纯水通量最高可达 81.22 L m h r -1 ，是原始 TFC 膜的 2.5 倍。
