Electro-enhanced Rapid Separation of Nanosized Oil Droplets from Emulsions via the Superhydrophilic Micro-sized Pore Membrane
Electro-enhanced Rapid Separation of Nanosized Oil Droplets from Emulsions via the Superhydrophilic Micro-sized Pore Membrane
复制标题
DOI：
10.1016/j.seppur.2023.123453
复制
发表时间：
2023-02
影响因子：
8.6
通讯作者：
Weiwei Zheng;Jing-cheng Xu;Liya Wang;Jialu Zhang;W. Chu;Jia Liu;Li-jun Lu;Chen Cai;Kaiming Pen
中科院分区：
文献类型：
--
作者：
Weiwei Zheng;Jing-cheng Xu;Liya Wang;Jialu Zhang;W. Chu;Jia Liu;Li-jun Lu;Chen Cai;Kaiming Pen
废乳化液是一种特殊的、难以处理的含油废水，它是由多个行业产生的。基于筛分效应，膜的使用是分离乳液的有前途的方法，而低通量仍然是一个基本的挑战。在本研究中，超亲水纤维膜与电场的耦合有助于在SDS（100-500 mg/L）稳定的水乳液（247-1887 nm）中分离微/纳米石蜡，具有普遍适用性。在电场作用下，微孔膜（0.634 μm）对纳米油滴（247 nm）具有良好的截留性能。它将通量从1，202 LMH/bar提高到18，388 LMH/bar，提高了1，429%，比其他文献高1-2个数量级，并将除油率从97.61%提高到99.88%。双电层力减小了膜的等效孔径，而源于膜纤维纺锤体的拉普拉斯力则促进了油滴的聚结，从而提高了选择性。电泳力和双电层力分别减缓了滤饼的形成和不可逆污垢的形成，促进了渗透性和渗透性。本研究提供了一种利用电场同时促进通量和改善出水水质的方法，该方法打破了权衡效应的限制。
Waste oil-in-water emulsion is a special and unmanageable oily wastewater produced by several industries. Based on the sieving effect, the use of a membrane is a promising method to separate emulsion, whereas low flux remains a fundamental challenge. In this study, the coupling of an electric field with superhydrophilic fibrous membranes helped separate micro-/nano- paraffin in water emulsions (247–1887 nm) stabilized by SDS (100–500 mg/L) with a general applicability. The micro-sized pore membrane (0.634 μm) achieved outstanding rejection of nano-sized oil droplets (247 nm) using an electric field. It promoted flux from 1,202 to 18,388 LMH/bar by 1,429 % which was more than that in other literature by 1–2 orders of magnitude and improved oil removal from 97.61 % to 99.88 %. The reduction of equivalent pore size of membrane by the double layer force and the promotion of coalescence of oil droplets driven by the Laplace force rooted in the fibrous spindle of the membrane achieved enhanced selectivity. Electrophoretic force and double layer force mitigated the formation of the filter cake and irreversible fouling, respectively, to promote permeability and antifouling. This research provides a method for the simultaneous promotion of flux and improvement in effluent quality using an electric field, which breaks the limit of the trade-off effect.