基于多巴胺亲水改性下Janus膜的制备及其油水乳液分离  

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

作　　者：山林娜 杨振生[1] 燕国飞 李春利[1] 李浩[1] 王志英[1] SHAN Linna;YANG Zhensheng;YAN Guofei;LI Chunli;LI Hao;WANG Zhiying(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)

机构地区：[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

出　　处：《化工进展》2022年第12期6500-6510,共11页Chemical Industry and Engineering Progress

基　　金：河北省自然科学基金(B2020202004)。

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/(m^(2)·h)和1729L/(m^(2)·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。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/(m^(2)·h)and 1729L/(m^(2)·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.

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 

分 类 号：TQ028.8[化学工程]