Silica composite membranes were successfully prepared by acid/ base-catalyzed sol-gel method and characterized by SEM, FTIR, AFM and contact angle Low isoelectric point of the silica layers provided negatively charged composite membranes, resulting electrostatic repulsion forces between membrane surface and amoxicillin molecules at higher pHs. The rejection rate of amoxicillin was studied systematically at different pHs, solute concentrations, transmembrane pressures and temperatures. It was found that acid-catalyzed membrane has higher amoxicillin rejection ratio compared to base-catalyzed membrane. Especially, acid-catalyzed membrane achieved the highest rejection of 90% at the transmembrane pressure of 6 bar, 45 °C, pH = 10, and initial feed concentration of 50 ppm. Long term stability exhibit that the membrane performance in permeation flux was steady for up to 100 h. However, the AMX rejection of 89% was maintained for over 250 h in acid-catalyzed membrane. It was concluded that the use of negatively charged ceramic membranes is promising for removal of amoxicillin from water resources.

采用酸/碱催化溶胶-凝胶法成功制备了二氧化硅复合膜，并通过 SEM、FTIR、AFM 和接触角进行表征。二氧化硅层的低等电点提供了带负电荷的复合膜，在膜表面和阿莫西林分子之间产生静电排斥力在较高的 pH 值下。系统研究了阿莫西林在不同pH、溶质浓度、跨膜压力和温度下的截留率。结果发现，与碱催化膜相比，酸催化膜具有更高的阿莫西林截留率。特别是，酸催化膜在跨膜压力为 6 bar、45 °C、pH = 10、初始进料浓度为 50 ppm 时实现了 90% 的最高截留率。长期稳定性表明膜的渗透通量性能在长达 100 小时内保持稳定。然而，在酸催化膜中，89% 的 AMX 截留率可保持超过 250 小时。结论是，使用带负电的陶瓷膜有望从水资源中去除阿莫西林。