Fabrication of a superhydrophilic PVDF membrane with excellent chemical and mechanical stability for highly efficient emulsion separation

被引:36
作者
Wang, Ming [1 ]
Xu, Zewen [1 ]
Hou, Yingfei [1 ]
Li, Peng [1 ]
Sun, Haixiang [1 ]
Niu, Q. Jason [1 ,2 ]
机构
[1] China Univ Petr East China, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China
[2] Shenzhen Univ, Inst Adv Study, Shenzhen 518060, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Chinese ink; PVDF membrane; Superhydrophilic; Oil/water separation; TANNIC-ACID; UNDERWATER SUPEROLEOPHOBICITY; ZEOLITE MEMBRANES; WATER; DESIGN; LAYER; FLUX;
D O I
10.1016/j.seppur.2020.117408
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The separation and recovery of oil from oily wastewater was still challenging due to the limitations of conventional separation techniques in its limited application fields, high operation cost and low separation efficiency. Membrane separation was a novel candidate to satisfy various separation tasks. Seeking for an efficient and facile strategy to manipulate the membrane performance was urgently needed. Chinese ink was a promising material to functionalize the membrane by virtue of the self-adhesion and intrinsic hydrophilicity. Herein, a composite polyvinylidene fluoride (PVDF) microfiltration membrane was fabricated via a facile rub-coating strategy. The micro/nano structures derived from the nanoparticles in Chinese ink readily facilitated the membrane with the superhydrophilicity and underwater superoleophobicity (underwater various oils contact angle above 150 degrees, underwater dichloromethane roll off angle similar to 3 degrees). The composite membrane exhibited a high permeation flux, a considerable separation efficiency for separating various oil-in-water emulsions and a superior recyclability for separating gasoline-in-water emulsion in ten cycles. Moreover, the membrane maintained a desirable underwater dichloromethane contact angle (above 145 degrees) after respectively being immersed in pH = 1 HCl, pH = 13 NaOH and 3.5 wt% NaCl solutions for one week, and a sandpaper abrasion test, demonstrating an excellent chemical stability and a robust mechanical durability.
引用
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页数:11
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