化工进展 ›› 2022, Vol. 41 ›› Issue (12): 6500-6510.DOI: 10.16085/j.issn.1000-6613.2022-0268

• 材料科学与技术 • 上一篇    下一篇

基于多巴胺亲水改性下Janus膜的制备及其油水乳液分离

山林娜(), 杨振生(), 燕国飞, 李春利, 李浩, 王志英   

  1. 河北工业大学化工学院,化工节能过程集成与资源利用国家地方联合工程实验室,天津 300130
  • 收稿日期:2022-02-22 修回日期:2022-03-26 出版日期:2022-12-20 发布日期:2022-12-29
  • 通讯作者: 杨振生
  • 作者简介:山林娜(1995—),女,硕士研究生,研究方向为膜科学与技术。E-mail:lnshan0528@163.com
  • 基金资助:
    河北省自然科学基金(B2020202004)

Asymmetric Janus membranes based on hydrophilic modification of dopamine for efficient oil/water separation

SHAN Linna(), YANG Zhensheng(), YAN Guofei, LI Chunli, LI Hao, WANG Zhiying   

  1. National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
  • Received:2022-02-22 Revised:2022-03-26 Online:2022-12-20 Published:2022-12-29
  • Contact: YANG Zhensheng

摘要:

目前用于处理含油废水的特殊润湿材料通常分为去油型和去水型,其仅局限分离单一乳液。本文基于多巴胺改性的聚偏氟乙烯(PVDF)膜,通过交替浸渍工艺和无纺布剥离,制备了具有不对称润湿性的Janus膜。通过调整交替次数以及剥离无纺布,可分别获得超亲水/水下超疏油的表面以及超疏水/超亲油的底面,水/水下油接触角(CA)差异高达150°。基于Janus膜的非对称润湿性,仅通过切换跨膜方向,对表面活性剂稳定的水包油(O/W)和油包水(W/O)乳液渗透通量高达367L/(m2·h)和1729L/(m2·h),其中水包油渗透液化学需氧量(COD)符合石油化工排放标准,油包水渗透液中水含量小于80mg/L,实现了对O/W和W/O乳液的高效分离。此外,Janus膜在牛血清蛋白(BSA)溶液分离过程中表现出理想的防污性能和可重复使用性。

关键词: 聚偏氟乙烯, Janus膜, 不对称润湿性, 交替浸渍, 油水乳液分离

Abstract:

Current special wetting materials used for treating oily wastewater are usually divided into the oil-removing type or the water-removing type, which are limited to separating single emulsion. In this paper, Janus membranes with asymmetric wettability were fabricated by alternating soaking process and non-woven peeling upon dopamine-modified PVDF membranes. By facilely adjusting the number of alternating soaking and peeling the nonwoven fabric, superhydrophilic/underwater superoleophobic surface and superhydrophobic/superoleophobic bottom surface could be respectively obtained, where the discrepancy in water contact angle between these two surfaces water contact angle was up to 150°. Based on the asymmetric wettability of Janus membranes, high permeate flux of 367L/(m2·h) and 1729L/(m2·h) were achieved for surfactant-stabilized oil-in-water (O/W) and water-in-oil (W/O) emulsions by simply switching the transmembrane direction, where the COD in the permeate of oil-in-water fulfilled the petrochemical discharge standard and the water content in the permeate of water-in-oil was less than 80mg/L, achieving efficient separation of O/W and W/O emulsions. Moreover, Janus membranes exhibited ideal antifouling property and reusability during BSA solution separation process.

Key words: poly(vinylidenefluoride) (PVDF), Janus membrane, asymmetric wettability, alternating soaking, oil/water emulsion separation

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