PDMS中空纤维渗透汽化膜处理含盐有机废水

本文以聚二甲基硅氧烷(PDMS)为膜材料,乙烯基三乙氧基硅烷(VTES)为交联剂,在聚偏氟乙烯(PVDF)中空纤维支撑膜表面通过交联反应制备出PDMS/PVDF中空纤维渗透汽化复合膜。采用扫描电子显微镜和全反射傅里叶红外光谱仪表征复合膜的形貌和结构变化。研究了膜对正丁醇-水、异丙醇-水及丙酮-水三种模拟含盐有机废水的分离效果,并考察了温度对膜性能的影响。结果表明:PDMS/PVDF中空纤维膜对这三种模拟含盐有机废水有较好的分离效果,操作温度为40 oC时,膜的渗透通量分别为275.95 g/(m2.h)、322.16 g/(m2.h)、489.76 g/(m2.h),分离因子为37.82、12.60、33.12。

Treatment of organic wastewater containing salt by PDMS hollow fiber pervaporation membrane

In this paper, the composite membrane of polydimethylsiloxane(PDMS)/polyvinylidene fluoride (PVDF) is prepared by cross-linking reaction of PDMS and triethoxyvinylsilane on PVDF hollow fiber membrane surface.Themembranesare characterized with scanning electronmicroscopyandattenuated total reflection Fourier transform infrared spectrum.Thepervaporation performance is investigated by separation of three simulate saline organic wastewaters, n-butanol-water, isopropanol-water and acetone-water, the effect of temperature on membrane separation performance is also determined. The results show that the membranes have good performance for separation of three saline organic wastewaters, when the operating temperature is 40 oC, the membranes exhibit the permeate flux of 275.95 g/m2?h,322.16 g/m2?h,489.76 g/m2?h, and separation factor is 37.82,12.60,33.12, respectively.