Scalable fabrication of robust superhydrophobic membranes by one-step spray-coating for gravitational water-in-oil emulsion separation

Lin, Jiuyang; Lin, Fang; Liu, Riri; Li, Ping; Fang, Shengqiong; Ye, Wenyuan; Zhao, Shuaifei

doi:10.1016/j.seppur.2019.115898

Cited by 93 publications

(22 citation statements)

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“…Recently, oil–water emulsion separation , has attracted growing academic and industrial interest due to its challenges and significance. − Large amounts of oily water are produced as liquid waste during industrial processing . Untreated oily emulsions cause severe environmental complications.…”

Section: Introductionmentioning

confidence: 99%

“…However, the most challenging issue in UF membranes with oily wastewater separation is oil/water emulsion separation, especially for the separation of surfactant-stabilized oil droplets (<20 μm). − The microemulsions with excellent dispersion can break through the size exclusion of the UF membrane. Most remarkably, almost all polymeric UF membranes are intrinsically oleophilic , and undergo fast flux declines due to surfactant adsorption and/or pore plugging by oil droplets, resulting in severe membrane fouling and low-efficient separation. , To solve these problems, considerable attention has been focused on the fabrication of superhydrophilic UF membranes via the combination of surface chemistry modifying and surface geometrical structure constructing. ,,− Many methods, such as surface coating, , blending, surface grafting, , and inorganic mineralization, , have been applied to endow polymeric UF membranes with superhydrophilic properties for the separation of oil-in-water emulsions. This is because superhydrophilic membranes can trap abundant water to form a hydration layer on their surfaces. , The trapped hydration layer significantly weakens the direct contact between oils and membrane surfaces, resulting in “superoleophobic or oil-resistant surfaces” with low oil-adhesion.…”

Section: Introductionmentioning

confidence: 99%

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Simple Amphoteric Charge Strategy to Reinforce Superhydrophilic Polyvinylidene Fluoride Membrane for Highly Efficient Separation of Various Surfactant-Stabilized Oil-in-Water Emulsions

Xiong

Mahmud

et al. 2020

ACS Appl. Mater. Interfaces

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Long-term efficient separation of highly emulsified oily wastewater is challenging. Reported herein is the preparation of a reinforced superhydrophilic, underwater superoleophobic membrane with demulsification properties using active iron nanoparticles in situ generated on a polydopamine (PDA)/ polyethylenimine (PEI)-modified polyvinylidene fluoride (PVDF) membrane surface. A stable zwitterionic structure is fabricated on the membrane surface and provides it with an excellent capability of binding a hydration layer, leading to enhanced superhydrophilic/underwater superoleophobic properties. The interaction between the membrane surface and water is quantified using the relaxation time of water. After iron nanoparticles in situ anchoring, the superhydrophilic, underwater superoleophobic PDA/PEI modified PVDF membrane shows more stable flux behaviors, higher oil separation efficiency, demulsification, and excellent antioil-fouling properties for various anionic, nonionic, and cationic surfactant-stabilized oil-in-water emulsions in a crossflow filtration system. The reinforced hydration layer and the amphoteric charged demusification properties of the membrane play important roles in enhancing the membrane separation performance. The reinforced membrane also exhibits excellent cleaning and reusability performance in long-term operations. The outstanding separation performance, as well as the simple and cost-effective fabrication process of the membrane with various favorable properties, highlight its promise in practical emulsified oily water applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simple Amphoteric Charge Strategy to Reinforce Superhydrophilic Polyvinylidene Fluoride Membrane for Highly Efficient Separation of Various Surfactant-Stabilized Oil-in-Water Emulsions

Xiong

Mahmud

et al. 2020

ACS Appl. Mater. Interfaces

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“…The separation efficiency ( R e ) of the nonwovens was calculated by eq , where C 1 and C 2 are the total organic carbon contents of the filtrates and the corresponding emulsions, respectively. For each separation cycle, 50 mL of oil/water emulsion was used.…”

Section: Methodsmentioning

confidence: 99%

Superwettable Amidoximed Polyacrylonitrile-Based Nanofibrous Nonwovens for Rapid and Highly Efficient Separation of Oil/Water Emulsions

Zhou

Zhang

et al. 2021

ACS Appl. Polym. Mater.

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Considering the progressively increasing oily wastewater in the world, the development of energy-saving and environmentally friendly materials with high efficiency and feasible preparation has been of great necessity. In this approach, the amidoximated silicon dioxide/polyacrylonitrile (AO-SiO2/PAN) nanofibrous nonwovens are produced by a combination of electrospinning and electrospraying. A more-porous and higher-roughness skin layer, compared to the pristine PAN nonwovens, is achieved by optimizing the conversion ratio of the nitrile groups during amidoximation. Meanwhile, the obtained nonwovens demonstrate remarkable superhydrophilicity and underwater superoleophobicity, which contributes to its superior oil/water separation performance. With the aid of the ultralow oil adhesion, the underwater oil contact angle (UWOCA) of the nonwovens is nearly 164.1 ± 2°. A high permeation flux of 2846 ± 162 L m–2 h–1 with a separation efficiency over 95.6% for surfactant-stabilized oil-in-water emulsions is achieved under an external pressure of 20 kPa. Moreover, the superior oil resistance of the skin layer endows the modified nonwovens with cycling separation performance, which is promising for applications in the field of oil/water separation.

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“…There are other examples where this combination of properties has been used to engineer materials for oil/water separation (Zhu et al, 2017 ; Ge et al, 2019 , 2020a ). A variety of nanomaterials have been used to create meshes (Jiang et al, 2017 ; Zhang et al, 2018a , 2019 ; Nanda et al, 2019 ; Wang et al, 2019 ; Gong et al, 2020 ), membranes (Attia et al, 2018 ; Huang et al, 2018 ; Ma et al, 2018 ; Qing et al, 2018 ; Zhao et al, 2018 ; Subramanian et al, 2019 ; Cheng et al, 2020 ), sponges (Huang et al, 2019b ; Li et al, 2019b ), and fabrics (Cheng et al, 2018 ; Chauhan et al, 2019 ; Lin et al, 2019 ; Zhou et al, 2019 ; Dan et al, 2020 ) with superhydrophobic and superoleophilic properties for oil/water separation (Ferrero et al, 2019 ; Zulfiqar et al, 2019 ; Latthe et al, 2020 ; Lin et al, 2020 ; Topuz et al, 2020 ; Zhang et al, 2020b ). Most of these materials separate oil either by filtration, absorption, or both.…”

Section: Separation Of Oil/water Mixturesmentioning

confidence: 99%

Surface Engineering of Ceramic Nanomaterials for Separation of Oil/Water Mixtures

et al. 2020

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Oil/water mixtures are a potentially major source of environmental pollution if efficient separation technology is not employed during processing. A large volume of oil/water mixtures is produced via many manufacturing operations in food, petrochemical, mining, and metal industries and can be exposed to water sources on a regular basis. To date, several techniques are used in practice to deal with industrial oil/water mixtures and oil spills such as in situ burning of oil, bioremediation, and solidifiers, which change the physical shape of oil as a result of chemical interaction. Physical separation of oil/water mixtures is in industrial practice; however, the existing technologies to do so often require either dissipation of large amounts of energy (such as in cyclones and hydrocyclones) or large residence times or inventories of fluids (such as in decanters). Recently, materials with selective wettability have gained attention for application in separation of oil/water mixtures and surfactant stabilized emulsions. For example, a superhydrophobic material is selectively wettable toward oil while having a poor affinity for the aqueous phase; therefore, a superhydrophobic porous material can easily adsorb the oil while completely rejecting the water from an oil/water mixture, thus physically separating the two components. The ease of separation, low cost, and low-energy requirements are some of the other advantages offered by these materials over existing practices of oil/water separation. The present review aims to focus on the surface engineering aspects to achieve selectively wettability in materials and its their relationship with the separation of oil/water mixtures with particular focus on emulsions, on factors contributing to their stability, and on how wettability can be helpful in their separation. Finally, the challenges in application of superwettable materials will be highlighted, and potential solutions to improve the application of these materials will be put forward.

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Scalable fabrication of robust superhydrophobic membranes by one-step spray-coating for gravitational water-in-oil emulsion separation

Cited by 93 publications

References 50 publications

Simple Amphoteric Charge Strategy to Reinforce Superhydrophilic Polyvinylidene Fluoride Membrane for Highly Efficient Separation of Various Surfactant-Stabilized Oil-in-Water Emulsions

Simple Amphoteric Charge Strategy to Reinforce Superhydrophilic Polyvinylidene Fluoride Membrane for Highly Efficient Separation of Various Surfactant-Stabilized Oil-in-Water Emulsions

Superwettable Amidoximed Polyacrylonitrile-Based Nanofibrous Nonwovens for Rapid and Highly Efficient Separation of Oil/Water Emulsions

Surface Engineering of Ceramic Nanomaterials for Separation of Oil/Water Mixtures

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