Multifunctional charged hydrogel nanofibrous membranes for metal ions contained emulsified oily wastewater purification
作者：Xu Zhu, Lei Zhu*, Hui Li, Jinwei Xue, Chao Ma, Yingying Yin, Xurong Qiao, Daofeng Sun,Qingzhong Xue*
關鍵字：Surface charge demulsification; Charged hydrogel nanofibrous membrane; Emulsion separation; Metal ions adsorption
論文來源：期刊
具體來源：Journal of Membrane Science (SCI 一區，IF=10.530)
發表時間：2021年
Abstract
Efficiently purifying metal ions contained emulsified oily wastewater has become a great challenge. Herein, a novel charged hydrogel nanofibrous membrane (CHNM) with negative surface charges, favorable mechanical ability and anti-fouling capacity was prepared via electrospinning and twice crosslinking process. The obtained CHNM with a surface potential of -32.9 mV at pH = 7.2 possesses outstanding oil-in-water emulsion separation performance with high permeation flux of around 10800 L h-1 m-2 bar-1 for surfactant free emulsion and high permeation flux of around 7100 L h-1 m-2 bar-1 for surfactant stabilized emulsion. The excellent oil/water emulsion separation performance can be attributed to the surface charge demulsification (SCD), which is theoretically demonstrated by a finite element analysis simulation. In addition, CHNM can absorb many kinds of metal ions (Fe3+, Ni2+ and Al3+) due to the chelation effect between high-density phosphate groups and metal ions. With outstanding separation performance for oil/water emulsion and good adsorption capacity for metal ions, the multifunctional CHNM may offer a promising approach to develop a new-generation membrane for treating metal ions contained oily wastewater.