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Achieving Three Things at One Stroke: Separation of Oil/Water Emulsion Simultaneously Absorption of Heavy Metal Ion and Dyes by One Multifunctional Superhydrophilic Coating Membrane
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  • Zhecun Wang,
  • Min Guan,
  • Xin Yang,
  • Hanzhen Li,
  • Shenghai Li,
  • Yaohan Chen
Zhecun Wang
Liaoning Technical University

Corresponding Author:[email protected]

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Min Guan
Liaoning Technical University
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Xin Yang
Liaoning Technical University
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Hanzhen Li
Liaoning Technical University
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Shenghai Li
Chang Chun Institute of Applied Chemistry Chinese Academy of Sciences
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Yaohan Chen
Chang Chun Institute of Applied Chemistry Chinese Academy of Sciences
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Abstract

Adsorption and separation are the most important chemical engineering processes for wastewater treatment. Exerting microfiltration membranes as the central separation technology and decorated it with absorption property, forming absorptive-membranes, result in the separation and purification of diverse wastewaters in an energy-efficient manner. Herein, a versatile polyanionic coating with superhydrophilicity/underwater superoleophobicity, superior anti-oil-fouling, and efficient charges is acquired through mussel-inspired co-deposition, followed by b-PEI functionalization, N-alkylation, and anionization. Thanks to the superhydrophilicity/underwater superoleophobicity, the as-prepared microfiltration membrane achieves selective separation of oil/water emulsions. Meanwhile, the functional membranes exhibited excellent selective and efficient adsorption capacity for organic dyes and heavy metal ions due to the abundant surface charges. Interestingly, benefiting from superhydrophilicity and considerable surface charges, the as-designed microfiltration membrane can realize selective and efficient simultaneously adsorption and separation of wastewaters with complicated components, including oil/water emulsions, organic dyes, and heavy metal ion by the concept of “achieving three things at one stroke”. Such a versatile and feasible strategy could pave a new path for constructing multifunctional membranes for complex wastewater treatment and purification.