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以聚乙烯醇(PVA)和糠醛(Fu)为主要原料,采用溶液涂敷法制备了聚乙烯醇缩糠醛(PVFu)复合纳滤膜,考查了聚乙烯醇的浓度、交联剂的用量及糠醛含量等对膜分离性能的影响。结果表明,在25℃,75%相对湿度条件下,通过质量分数5%的聚乙烯醇溶液与1%的糠醛缩醛化交联反应所制得的纳滤膜在1.0 MPa操作压力下对PEG600的截留率达到98.30%,水通量为11.3 L.m-2.h-1。随着操作压力的增加,通量呈线性增加,截留率也相应上升;该膜有较好的耐氯性;用红外光谱仪表征了复合膜的分子结构。用原子力显微镜(AFM)观察了复合膜的表面形态,用X射线衍射仪研究了聚乙烯醇缩糠醛固化后的结晶状态,并用动态活性氯测试法测试膜的耐氯性。
Polyvinyl alcohol (PVA) and furfural (Fu) were used as raw materials to prepare polyvinylfurfural (PVA) nanofiltration membrane by solution coating method. The concentration of polyvinyl alcohol, the amount of crosslinking agent, Effect of furfural content on membrane separation performance. The results showed that under the conditions of 25 ℃ and 75% relative humidity, the nanofiltration membrane prepared by the acetalization of polyvinyl alcohol solution with 1% furfural by 5% The retention rate reached 98.30% and the water flux was 11.3 Lm-2.h-1. With the increase of operating pressure, the flux increases linearly and the rejection rate increases accordingly. The film has better chlorine resistance. The molecular structure of the composite membrane is characterized by infrared spectroscopy. The surface morphology of the composite films was observed by atomic force microscopy (AFM). The crystalline state of polyvinyl alcohol after furfural curing was investigated by X-ray diffractometer. The chlorine resistance of the films was tested by dynamic reactive chlorine method.