State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Institute of Pollution Control and Ecological Security, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Institute of Pollution Control and Ecological Security, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Water Res. 2022 Jul 1;219:118539. doi: 10.1016/j.watres.2022.118539. Epub 2022 May 3.
Membrane fouling, especially biofouling induced by biofilm formation on membranes, can result in frequent cleaning or even replacement of membranes. Fabrication of membrane with excellent antibiofouling property is quite attractive due to its effectiveness and low-impact on the operation of membrane-based process. Herein, a cationic antibacterial agent, quaternary ammonium compound (QAC), was intercalated into the interlayer spaces of the MgAl layered double hydroxide (QAC/LDH) by self-assembly. The QAC/LDH composite was incorporated into polyethersulfone (PES) ultrafiltration (UF) membrane (PES-QLDH). The QAC/LDH enhanced the hydrophilicity, water flux, and resistance to organic fouling for the PES-QLDH membrane. The PES-QLDH membrane exhibited superior antibiofouling performance than the control PES membrane, with deposition of a thinner biofilm layer consisted of almost dead cells. The superior antibacterial activity inhibits the adhesion and growth of bacteria on the membrane surface, effectively retarding the formation of biofilms. Importantly, the synergistic effect of QAC and LDH in the PES-QLDH membrane resulted in a high biocidal activity based on both direct and indirect killing mechanisms. The PES-QLDH membrane maintained a stable and high antibacterial activity after several fouling-cleaning cycles. These results imply that the PES-QLDH membrane provides an effective and promising strategy for its long-term application in wastewater treatment.
膜污染，特别是由膜上生物膜形成引起的生物污染，会导致频繁的清洗甚至更换膜。由于其有效性和对膜基工艺运行的低影响，制造具有优异抗生物污染性能的膜是非常有吸引力的。在此，通过自组装将阳离子抗菌剂季铵化合物 (QAC) 插入到 MgAl 层状双氢氧化物 (QAC/LDH) 的层间空间中。将 QAC/LDH 复合材料掺入聚醚砜 (PES) 超滤 (UF) 膜 (PES-QLDH) 中。QAC/LDH 提高了 PES-QLDH 膜的亲水性、水通量和抗有机污染性。与对照 PES 膜相比，PES-QLDH 膜表现出优异的抗生物污染性能，其生物膜层更薄，几乎由死细胞组成。优异的抗菌活性抑制了细菌在膜表面的黏附和生长，有效地阻止了生物膜的形成。重要的是，PES-QLDH 膜中 QAC 和 LDH 的协同作用基于直接和间接杀菌机制产生了高杀菌活性。PES-QLDH 膜在经过几次污染-清洗循环后仍保持稳定和高的抗菌活性。这些结果表明，PES-QLDH 膜为其在废水处理中的长期应用提供了一种有效且有前景的策略。
