Multifunctional Switchable Nanocoated Membranes for Efficient Integrated Purification of Oil/Water Emulsions

Abstract

Surfaces with unusual under-liquid dual superlyophobicity are attractive on account of their widespread applications, but their development remains difficult due to thermodynamic contradiction. Additionally, these surfaces may suffer from limited antifouling ability, which has restricted their practical applications. Herein, we report a successful in situ growth of a hybrid zeolitic imidazolate framework-8 and zinc oxide nanorod on a porous poly(vinylidene fluoride

Special Superwetting Materials from Bioinspired to Intelligent Surface for On‐Demand Oil/Water Separation: A Comprehensive Review

“…fabricated a dual‐superlyophobic membrane with photocatalytic self‐cleaning property by in situ growth of a hybrid ZIF‐8 and ZnO nanorod on the porous polyvinylidene difluoride (PVDF) in Figure 15h. [ 126 ] In this work, as shown in Figure 15i–k, the membrane with UWSOB/UOSHB obtained by prewetting could realize high efficiency (>99%) switchable oil/water emulsions separation. After UV radiation, the photocatalysis derived from ZnO on the membrane could construct a heterojunction structure to degrade soluble organic pollutants.…”

Janus Nanofiber Antibacterial Membrane for Switchable Separation of Oil/Water Emulsions

“…The sizes of the droplet after separation range from 0.5 to 1 nm, with an average size of 0.6 nm. According to previous studies, 30,31 low intensity of about a few nanometers in the collected filtrate samples is attributed to the residual surfactants that pass through the membrane. The results of DLS measurements also confirm the successful separation of the emulsion.…”

Green Preparation of a Carboxymethyl Cellulose-Coated Membrane for Highly Efficient Separation of Crude Oil-In-Water Emulsions

“…40,41 It is noteworthy that there are many possibilities for the combination of metal ions and organic ligands, so they have adjustable structures and chemical properties. 38,42 As one of the most widely used MOFs, ZIF-8 is used in the preparation of oil/water separation membranes due to its superior hydrothermal stability. 40,43,44 ZIF-8 nanoparticles are inherently hydrophobic, and there are problems such as poor dispersion and particle agglomeration in the aqueous solution.…”

“…In comparison, water has recently been reported as a sustainable solvent substitute that can replace toxic solvents. , Meanwhile, carboxymethyl cellulose (CMC) is a natural hydrophilic cellulose material with the advantages of nontoxic nature, good solubility in water, and biocompatibility. , Due to different physical, chemical, and biological characteristics, CMC has been used as an emulsifier, adhesive, and protective coating in the food industry, agriculture, and wastewater treatment . In addition, MOFs are a kind of organic–inorganic hybrid materials with high porosity, large specific surface area, and low density. , It is noteworthy that there are many possibilities for the combination of metal ions and organic ligands, so they have adjustable structures and chemical properties. , As one of the most widely used MOFs, ZIF-8 is used in the preparation of oil/water separation membranes due to its superior hydrothermal stability. ,, ZIF-8 nanoparticles are inherently hydrophobic, and there are problems such as poor dispersion and particle agglomeration in the aqueous solution. , Surprisingly, further hydrophilic modification of ZIF-8 greatly broadens its application range. Dopamine (DA) forms a thin layer of polydopamine (PDA) with strong adhesion on the surface of ZIF-8 through oxidative self-polymerization, which can significantly improve the hydrophilicity of ZIF-8. ,− Hence, combining low-cost raw materials and water solvents to synthesize superwetting membranes for the treatment of oily emulsions is very promising.…”