A core–shell fiber-constructed pH-responsive nanofibrous hydrogel membrane for efficient oil/water separation

Zang, Linlin; Ma, Jun; Lv, Dongwei; Liu, Qingliang; Jiao, Wenling; Wang, Panpan

doi:10.1039/c7ta05148d

Cited by 96 publications

(43 citation statements)

References 46 publications

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“…Poly(methyl acrylic acid) (PMAA, M w ¼ 310 000) was fabricated by free radical polymerization. 24,25 Preparation of the PCPG composite membrane Fig. 1 shows the preparation process for the PCPG composite membrane.…”

Section: Methodsmentioning

confidence: 99%

Hydrophilic polymer-stabilized porous composite membrane for water evaporation and solar desalination

et al. 2020

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Section: Methodsmentioning

confidence: 99%

Hydrophilic polymer-stabilized porous composite membrane for water evaporation and solar desalination

et al. 2020

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“…The separation efficiency was calculated from the water rejection coefficient R (%) using the following equation

R (%) = (1 - C_{f} normal/ C_{0}) \times 100 %

where C 0 and C f are the oil concentrations in the original oil‐in‐water emulsion and the collected water, respectively …”

Section: Methodsmentioning

confidence: 99%

Multilayer Network Membranes Based on Evenly Dispersed Nanofibers/Co₃O₄ Nanoneedles for High‐Efficiency Separation of Micrometer‐Scale Oil/Water Emulsions

Qian

Chen

et al. 2018

Adv Materials Inter

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often stable and have complex structures because of the presence of surfactants. [12] This is particularly the case for micrometer-scale emulsions with droplet sizes smaller than 20 µm. Therefore, a low-cost, high-efficiency separation technology was urgently needed to mitigate or even solve these pollution problems.Membrane filtration techniques such as ultrafiltration [13,14] are mainly based on a "size-sieving" effect and have been used to separate various emulsified oil/ water mixtures during large-scale processing because they give simple separation and have low energy consumption. Wettability [15][16][17] is a key feature of membranes for oil/water separation. A superhydrophobic/superoleophilic membrane can filter oil from water, whereas a superhydrophilic/underwater superoleophobic membrane can be used to filter water from oil. [18] However, a single wetting film can separate surfactant-free oil/water mixtures but not emulsified oil/water mixtures. A membrane with an appropriate pore size, i.e., less than the diameter of the emulsion droplets, and appropriate wettability can effectively separate emulsified oil/water mixtures. [19,20] In view of this membrane separation technology, we used a low-cost, corrosion-resistant stainless steel mesh for hydrothermal treatment and compounding with sodium titanate nanowires to perform oil-water separation, which solves the drawbacks of low-cost, high-efficiency separation that conventional separation technologies cannot achieve.In previous studies, researchers have designed various types of separation membranes based on the two strategies described above; these membranes have mainly consisted of organic and inorganic films. [21][22][23] Organic membranes such as the poly(vinylidene fluoride) membrane [24] fabricated by Jiang and co-workers and the hierarchical membranes [25] fabricated by Yang and co-workers give excellent emulsion separation for a variety of water phases and relatively inert oils such as diesel or gasoline. Inorganic films have been receiving increasing attention because of their superior mechanical properties, stability, and facile and inexpensive preparation methods; they give high flux, and sustained and efficient separation. For example, a TiO 2 nanocluster-based mesh [26] fabricated by Feng and co-workers, free-standing CaCO 3 film [27] prepared by Wang and co-workers, Ultrawetting membranes have enabled great progress in oil/water separation and have helped to address global industrial wastewater pollution and marine oil spills. However, there are few reports of 3D multilayer network membranes that can be easily prepared, and give efficient separation in micro-and nanoscale oil-in-water emulsions. A membrane is designed for emulsion separation; it consists of ultralong (over 10 µm) sodium titanate nanofibers as the selective layer and a jungle-like Co 3 O 4 nanoneedles mesh as the support layer. This mesh shows superhydrophilicity in air and lowadhesive superoleophobicity under water. This membrane gives 99.9% separation efficiency and good pe...

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“…[47,98] Through pH-controlled self-assembly and disassembly of stearic acid, the PDMAEMA hydrogel-coated stainless steel mesh could selectively remove water or oil from oil/water mixtures with high efficiency (Figure 8c). pH, an essential feature for aqueous solutions, was employed to control the separation of oil/water mixtures.…”

Section: Liquid/liquid Separationmentioning

confidence: 99%

Recent Advances in Bioinspired Gel Surfaces with Superwettability and Special Adhesion

Zhang

Zhao

et al. 2019

Advanced Science

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Engineering surface wettability is of great importance in academic research and practical applications. The exploration of hydrogel‐based natural surfaces with superior properties has revealed new design principles of surface superwettability. Gels are composed of a cross‐linked polymer network that traps numerous solvents through weak interactions. The natural fluidity of the trapped solvents confers the liquid‐like property to gel surfaces, making them significantly different from solid surfaces. Bioinspired gel surfaces have shown promising applications in diverse fields. This work aims to summarize the fundamental understanding and emerging applications of bioinspired gel surfaces with superwettability and special adhesion. First, several typical hydrogel‐based natural surfaces with superwettability and special adhesion are briefly introduced, followed by highlighting the unique properties and design principles of gel‐based surfaces. Then, the superwettability and emerging applications of bioinspired gel surfaces, including liquid/liquid separation, antiadhesion of organisms and solids, and fabrication of thin polymer films, are presented in detail. Finally, an outlook on the future development of these novel gel surfaces is also provided.

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A core–shell fiber-constructed pH-responsive nanofibrous hydrogel membrane for efficient oil/water separation

Abstract: A core–shell fiber-constructed pH-responsive nanofibrous hydrogel membrane was fabricated for gravity-driven oil/water separation in acid, neutral, and alkali environments.

Cited by 96 publications

References 46 publications

Hydrophilic polymer-stabilized porous composite membrane for water evaporation and solar desalination

Hydrophilic polymer-stabilized porous composite membrane for water evaporation and solar desalination

Multilayer Network Membranes Based on Evenly Dispersed Nanofibers/Co₃O₄ Nanoneedles for High‐Efficiency Separation of Micrometer‐Scale Oil/Water Emulsions

Recent Advances in Bioinspired Gel Surfaces with Superwettability and Special Adhesion

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A core–shell fiber-constructed pH-responsive nanofibrous hydrogel membrane for efficient oil/water separation

Abstract: A core–shell fiber-constructed pH-responsive nanofibrous hydrogel membrane was fabricated for gravity-driven oil/water separation in acid, neutral, and alkali environments.

Cited by 96 publications

References 46 publications

Hydrophilic polymer-stabilized porous composite membrane for water evaporation and solar desalination

Hydrophilic polymer-stabilized porous composite membrane for water evaporation and solar desalination

Multilayer Network Membranes Based on Evenly Dispersed Nanofibers/Co3O4 Nanoneedles for High‐Efficiency Separation of Micrometer‐Scale Oil/Water Emulsions

Recent Advances in Bioinspired Gel Surfaces with Superwettability and Special Adhesion

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Multilayer Network Membranes Based on Evenly Dispersed Nanofibers/Co₃O₄ Nanoneedles for High‐Efficiency Separation of Micrometer‐Scale Oil/Water Emulsions