含油废水处理用亲水性聚醚酰亚胺-醋酸纤维素共混中空纤维膜的制备

Moslem Nazarian, A. Mansourizadeh, Mehran Abbasi
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引用次数: 2

摘要

膜分离是一种高效的含油废水处理技术。本研究将醋酸纤维素(CA)引入聚醚酰亚胺(PEI)溶液中,以增强聚醚酰亚胺(PEI)溶液的亲水性和油水分离膜结构。采用相变法制备中空纤维膜。通过N2渗透试验、水接触角、纯水通量和场发射扫描电镜(FESEM)对膜进行了表征。共混PEI-CA膜呈较大的指状形态,外表皮层较厚。N2渗透测试表明,共混膜的有效表面孔隙率为697 m-1,平均孔径为4.5 nm。共混PEI-CA膜具有较高的水通量和较低的阻力,这与膜具有较高的亲水性和开放结构有关。由于该共混膜孔径小,亲水性增强,在分离操作100 min后,其排油率稳定在98%以上,水通量为18 L/m2 h。所研制的PEI-CA膜在石油化工、炼油等行业的含油废水处理中具有潜在的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparation of Blend Hydrophilic Polyetherimide-Cellulose Acetate Hollow Fiber Membrane for Oily Wastewater Treatment
Membrane separation is known as an efficient technique for oily wastewater treatment. In the present study, cellulose acetate (CA) was introduced into the polyetherimide (PEI) solution in order to enhance hydrophilicity and the membrane structure for oil–water separation. The hollow fiber membranes were prepared via a phase-inversion process. The membranes were characterized by N2 permeation test, water contact angle, pure water flux and field emission scanning electron microscopy (FESEM). The blend PEI-CA membrane presented larger finger-likes morphology with a thicker outer skin layer. From N2 permeation test, the blend membrane showed effective surface porosity of 697 m-1 and mean pore size of 4.5 nm. The higher water flux and lower resistance of the blend PEI-CA membrane were related to the higher hydrophilicity and the open structure. Due to small pore sizes and enhanced hydrophilicity, the blend membrane showed a stable oil rejection of over 98% and water flux of 18 L/m2 h after 100 min of the separation operation. The developed PEI-CA membrane can potentially be applied in petrochemical and refinery industries for oily wastewater treatment.
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