以合成的颗粒尺寸为140 nm×450 nm×1 μm的ZIF-71晶体为添加物、PEBA2533为有机基质,在PTFE载体上制备了一系列ZIF-71/PEBA2533/PTFE混合基质膜,并利用SEM、XRD和FT-IR等表征方法研究不同尺寸ZIF-71晶体及相应膜材料的形貌和结构,探究ZIF-71颗粒尺寸对膜材料结构的调节作用,同时将膜材料应用于苯酚-水溶液的分离。结果表明,小尺寸的ZIF-71晶体在膜中分布均匀且未发生团聚,但当添加物颗粒尺寸较大时会发生团聚现象。掺杂小尺寸ZIF-71颗粒可同时提高膜材料的苯酚通量和分离因子。

ZIF-71 crystals with a crystal size of 140 nmx450 nmx1 μm are synthesized.A series of ZIF-71/PEBA2533/PTFE mixed matrix membranes (MMMs) are prepared on PTFE carrier with ZIF-71 as the additive and PEBA2533 as the organic matrix.The morphology and structure of ZIF-71 crystals and corresponding MMMs are characterized by means of SEM,XRD,and FTIR-ATR.The adjustment effect of ZIF-71 particle size on the structure of MMMs is explored.The ZIF-71-based MMMs are applied to phenol-water solution separation.It is found that small particles of ZIF-71 crystals distribute evenly in the MMMs without any agglomeration.There happens to agglomeration when large ZIF-71 particles are added in the MMMs.MMMs loaded with small particles of ZIF-71 shows higher phenol flux and separation factor.

郝鹏(1994-),男,硕士研究生,研究方向为膜制备及其应用,244280134@qq.com