Multifunctional charged hydrogel nanofibrous membranes for metal ions contained emulsified oily wastewater purification
2021
Zhu, Xu | Zhu, Lei | Li, Hui | Xue, Jinwei | Ma, Chao | Yin, Yingying | Qiao, Xurong | Sun, Daofeng | Xue, Qingzhong
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.
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