In-situ self-dissolving and regenerating synthesis of superwetting cotton fabric with excellent oil/water emulsions separation performance

Abstract The textiles with superhydrophilicity and underwater superoleophobicity have shown excellent separation performance for emulsified oil in wastewater, but they still suffer from complicated construct of hierarchical architectures and hydrophilic surface. Herein, a hydrophilic hierarchical layer of cellulose is constructed on commercial cotton fabric surface via a proposed in-situ self-dissolving and regenerating strategy. The cellulose provides both hydrophilic surface and hierarchical structural foundation for the remodeled cotton fabric (RCF) without any further chemical modification. The obtained RCF has strong superhydrophilicity, underwater superoleophobicity, and anti-oil-adhesion property, which can be applicable for efficient oil-in-water emulsion separation with high separation efficiency and recyclable antifouling performance. The developed RCF assembly strategy provides an excellent membrane for the separation of oil-in-water emulsion, and a new prospect for the convenient and universal construct of other superwetting cellulose-based materials.

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Asymmetrically Wettability Janus Cotton Fabrics Fabricated via Interfacial Ion Migration for Surfactant-stabilized Oil-in-water Emulsions

10.21203/rs.3.rs-232628/v1 ◽

2021 ◽

Author(s):

Pu Yang ◽

Ruimin Hu ◽

Bin Yu ◽

Yiwei Sun ◽

Yiping Liu ◽

...

Keyword(s):

Cotton Fabric ◽

Separation Efficiency ◽

Human Life ◽

Sodium Dodecyl ◽

Separation Performance ◽

Step Method ◽

Ion Migration ◽

Oil In Water ◽

Fabric Surface ◽

High Separation

Abstract Separation of surfactant-stabilized oil-water emulsions seems to be challenging owing to its diverse repercussions on environment and human life. The asymmetrical wettability Janus cotton fabric (J-MH@CF) with high separation performance was prepared by two-step method, which related to interfacial ion migration technology and unilateral spraying treatment. In detail, the immobilization of magnesium hydroxide (Mg(OH)2) caused the formation of the rough micro/nanostructure of cotton fabric surface, which was helpful to superhydrophilic property. Stearic acid as a coating created the unilateral superhydrophobic surface with low surface energy. J-MH@CF showed asymmetric wettability, featuring diode-like directional water transmission. Wettability, directional transmission and separation performance of J-MH@CF membrane were investigated systematically. The asymmetric wettability architecture was demonstrated to play a key role in separating surfactant-stabilized oil-in-water emulsions. Impressingly, the separation performance was not affected by the type of surfactants. For emulsion stabilized by sodium dodecyl sulfate (SDS), the separation flux driven by gravity was approximately 500 L m-2h-1, and all separation efficiencies were over 99.3%. CTAB/Oil/H2O emulsion and the Tween-60/Oil/H2O emulsion also could be successfully separated with high separation efficiency and separation flux. During the whole separation process, the oil droplets surrounded by surfactants (Oil-Ss) were difficult to demulsify and gathered on the surface of the fabric to form a "creamy layer", which was beneficial to improve separation efficiency and could be cleaned off so that J-MH@CF membrane was not contaminated. In addition, the J-MH@CF membrane exhibited robust reusability for separation, which was promising for remediation of oily wastewater containing surfactants.

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Superhydrophilic fluorinated polyarylate membranes via in situ photocopolymerization and microphase separation for efficient separation of oil-in-water emulsion

RSC Advances ◽

10.1039/c8ra08323a ◽

2019 ◽

Vol 9 (2) ◽

pp. 958-962 ◽

Cited By ~ 1

Author(s):

Hui Li ◽

Cuiping Zhou ◽

Chunsheng Li ◽

Xiaohui Li ◽

Shuxiang Zhang

Keyword(s):

Tensile Strength ◽

Separation Efficiency ◽

Microphase Separation ◽

High Tensile Strength ◽

Water Emulsion ◽

Efficient Separation ◽

Oil In Water ◽

Oil In Water Emulsion ◽

High Separation

We have developed a novel superhydrophilic FPAR membrane with high tensile strength by in situ photocopolymerization and microphase separation, which can effectively separate oil-in-water emulsions with high separation efficiency and flux.

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A Novel Modified Cotton Fabric with Durable Anti-Fouling Performance for Separation of Surfactant-stabilized Oil-in-water Emulsions

10.21203/rs.3.rs-1023069/v1 ◽

2021 ◽

Author(s):

Pu Yang ◽

Ruimin Hu ◽

Yu Bin ◽

Yiwei Sun ◽

Yiping Liu ◽

...

Keyword(s):

Cotton Fabric ◽

Separation Efficiency ◽

Protective Layer ◽

Separation Performance ◽

Step Method ◽

Nano Structure ◽

Ion Migration ◽

Oil In Water ◽

Tween 60 ◽

Fabric Surface

Abstract Membrane applications for the separation of surfactant-stabilized emulsions are often constrained by a deficiency in permeability and anti-fouling properties. Herein, special wetted cotton fabric with a protective layer (P-MH@CF) for durable anti-fouling performance was designed by a two-step method, which was related to interfacial ion migration technology and unilateral spraying treatment. In detail, the immobilization of magnesium hydroxide caused the formation of the rough micro/nano structure of the cotton fabric surface. The stearic acid acted as a protective layer, like a quilt, protecting the membrane from contamination. Permeability of water and separation performance of P-MH@CF membrane were investigated systematically. For emulsion stabilized by SDS (SDS/Oil/H2O), the separation flux driven by gravity was approximately 500 L m -2 h -1 , and all separation efficiencies were over 99.3 %. CTAB/Oil/H2O emulsion and the Tween-60/Oil/H2O emulsion also could be successfully separated with high separation efficiency and separation flux. During the whole separation process, the oil droplets surrounded by surfactants were difficult to demulsify and gathered physically on the surface of the fabric to form a "creamy layer", which could be cleaned off so that the P-MH@CF membrane was not contaminated. In addition, the P-MH@CF membrane exhibited robust reusability for separation, which was promising for the remediation of oily wastewater containing surfactants.

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Enhancing oil-in-water emulsion separation performance of polyvinyl alcohol hydrogel nanofibrous membrane by squeezing coalescence demulsification

Journal of Membrane Science ◽

10.1016/j.memsci.2021.119324 ◽

2021 ◽

pp. 119324

Author(s):

Xu Zhu ◽

Lei Zhu ◽

Hui Li ◽

Chunyu Zhang ◽

Jinwei Xue ◽

...

Keyword(s):

Polyvinyl Alcohol ◽

Nanofibrous Membrane ◽

Separation Performance ◽

Water Emulsion ◽

Oil In Water ◽

Emulsion Separation ◽

Oil In Water Emulsion

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Desert beetle-like microstructures bridged by magnetic Fe3O4 grains for enhancing oil-in-water emulsion separation performance and solar-assisted recyclability of graphene oxide

Chemical Engineering Journal ◽

10.1016/j.cej.2021.130904 ◽

2021 ◽

pp. 130904

Author(s):

Yong Xu ◽

Gang Wang ◽

Lijing Zhu ◽

Wanshun Deng ◽

Chunting Wang ◽

...

Keyword(s):

Graphene Oxide ◽

Separation Performance ◽

Water Emulsion ◽

Oil In Water ◽

Emulsion Separation ◽

Desert Beetle ◽

Oil In Water Emulsion ◽

Magnetic Fe3o4

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Novel Polymer Material for Efficiently Removing Methylene Blue, Cu(II) and Emulsified Oil Droplets from Water Simultaneously

Polymers ◽

10.3390/polym10121393 ◽

2018 ◽

Vol 10 (12) ◽

pp. 1393 ◽

Cited By ~ 6

Author(s):

Jie Cao ◽

Jianbei Zhang ◽

Yuejun Zhu ◽

Shanshan Wang ◽

Xiujun Wang ◽

...

Keyword(s):

Methylene Blue ◽

Separation Efficiency ◽

Crosslinking Agent ◽

Cost Effective ◽

Preparation Process ◽

Water Emulsion ◽

Practical Applications ◽

Oil In Water ◽

Oil In Water Emulsion ◽

Oil Fouling

The pollution of water resources has become a worldwide concern. The primary pollutants including insoluble oil, toxic dyes, and heavy metal ions. Herein, we report a polymer adsorbent, named SPCT, to remove the above three contaminants from water simultaneously. The preparation process of SPCT contains two steps. Firstly, a hydrogel composed of sulfonated phenolic resin (SMP) and polyethyleneimine (PEI) was synthesized using glutaraldehyde (GA) as the crosslinking agent, and the product was named SPG. Then SPCT was prepared by the reaction between SPG and citric acid (CA) at 170 ∘ C. SPCT exhibited an excellent performance for the removal of methylene blue (MB) and Cu(II) from aqueous solution. For a solution with a pollutant concentration of 50 mg L−1, a removal efficiency of above 90% could be obtained with a SPCT dosage of 0.2 g L−1 for MB, or a SPCT dosage of 0.5 g L−1 for Cu(II), respectively. SPCT also presented an interesting wettability. In air, it was both superhydrophilic and superoleophilic, and it was superoleophobic underwater. Therefore, SPCT could successfully separate oil-in-water emulsion with high separation efficiency and resistance to oil fouling. Additionally, SPCT was easily regenerated by using dilute HCl solution as an eluent. The outstanding performance of SPCT and the efficient, cost-effective preparation process highlight its potential for practical applications.

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