孤立铁/聚醚砜复合膜的制备及其油水乳液分离与苯酚降解性能
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1.山东理工大学 材料科学与工程学院;2.天津工业大学 分离膜与膜过程国家重点实验室

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国家自然科学基金项目(21978217); 湖南省科技创新计划(2020RC2082)


Preparation of isolated iron/polyethersulfone composite membrane and its performance in oil-water emulsion separation and phenol degradation
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    摘要:

    针对复杂含油废水的处理,发展能同时分离油水混合物并能降解其中酚类等有机污染物的技术是未来油水分离膜的研究重点。本文以聚醚砜(PES)为膜材料,通过双凝固浴相转化法制备了高通量、抗压密性好的海绵孔结构PES基膜。通过在膜表面共沉积聚多巴胺(PDA)和聚乙烯亚胺(PEI)来负载孤立铁物种(4A-Fe)催化剂颗粒,得到4A-Fe/PES膜。考察了4A-Fe/PES膜的油水分离性能和苯酚催化降解性能。结果显示,4A-Fe/PES有较好的亲水性、优异的水下超疏油性以及抗油粘附性。且在动态分离乳化油水混合物的同时,实现了对油水乳液中苯酚的有效降解。在pH=2时,溶液循环50 min后膜对苯酚降解率达到98.4%,此过程中油水乳液的分离效率保持在99.8%,且重复使用三次后,膜的分离效率仍然能达到94.2%以上。

    Abstract:

    The oil leakage and discharge of organic pollutants such as phenols have caused serious harm to water environment and human health. The development of technologies that can simultaneously separate oil-water mixtures (especially emulsified oil-water mixtures) and degrade phenols and other organic pollutants is the research focus of oil-water separation membrane or catalytic membrane in future. In this paper, the polyethersulfone (PES) membrane with sponge-like pore structure, high water flux and good compressive resistance was prepared by the phase inversion method with dual-bath coagulation. The 4A-Fe/PES membrane was prepared by co-deposition of PDA/PEI on the membrane surface and subsequent loading of iron species catalyst (4A-Fe) particles. The oil-water separation performance and phenol degradation performance of 4A-Fe/PES membrane were investigated. The results showed that 4A-Fe/PES had good hydrophilicity, oil resistance adhesion and excellent underwater superhydrophobicity. In addition, the degradation of phenol in the oil-water emulsion was realized while dynamically separating the oil-water emulsion. At pH 2, the conversion of phenol reached 98.4% after 50 min, and the separation efficiency of oil-water emulsion reached 99.8%. The separation efficiency of the membrane maintained 94.2% after repeated use for three times.

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  • 收稿日期:2021-09-04
  • 最后修改日期:2022-01-13
  • 录用日期:2022-03-26
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