冷冻辅助-界面反应法制备ZIF-8衍生物纳滤膜及其药物脱盐性能研究

Preparation of ZIF-8 derivative composite membrane by freezing assisted-interface reaction method and its pharmaceutical desalination performance

纳滤膜分离技术在药物脱盐领域具有较大应用潜力,而开发高性能的纳滤膜材料仍具有较大挑战.本研究采用冷冻辅助-界面反应法在氧化铝多孔支撑体内部原位生长了ZIF-8分离层,然后通过硫化处理形成ZIF-8衍生物(ZnS),提高了纳滤膜的渗透性和稳定性.通过SEM、EDS、XRD以及FT-IR等手段对ZIF-8及其衍生物复合膜的结构和化学性质进行了表征.将ZIF-8及其衍生物复合膜用于药物脱盐,考察了前驱体摩尔比、浓度以及反应温度对纳滤性能的影响.在最优条件下,ZnS纳滤膜对四环素的截留率为99.1%,对NaCl截留率小于10%,通量为335.6 L/(m^(2)·h·MPa),表现出良好的抗生素脱盐性能和稳定性.

The nanofiltration membrane separation technology has great potential for application in the field of pharmaceutical desalination.The development of new membrane materials with high performance has a great challenge.In this study,a ZIF-8 separation layer was prepared on alumina substrate using a freezing assisted-interface reaction method.Subsequently,the ZIF-8 derivatives(ZnS)were formed through sulfurization treatment to improve the permeability and stability of the nanofiltration membrane.The structure and morphology of ZIF-8 and its derivative composite membranes were characterized by SEM,EDS,XRD,FTIR,and AFM.The obtained ZIF-8 and its derivative composite membranes were used for pharmaceutical desalination.The effects of precursor molar ratio,concentration,and reaction temperature on nanofiltration performance were investigated.With the optimal conditions,the ZnS nanofiltration membrane exhibited a rejection rate of 99.1%for tetracycline,less than 10%for NaCl,and a flux of 335.6 L/(m^(2)·h·MPa),demonstrating good pharmaceutical desalination performance and stability.