Mussel-inspired superhydrophilic membrane constructed on a hydrophilic polymer network for highly efficient oil/water separation

Xu, Zhongzheng; Li, Lin; Liu, Jiawei; Dai, Caili; Sun, Wen; Chen, Jia; Zhu, Zhixuan; Zhao, Mingwei; Zeng, Hongbo

doi:10.1016/j.jcis.2021.09.123

Cited by 60 publications

(18 citation statements)

References 48 publications

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“…When the membrane came in contact with water/emulsion, preferentially, it would try to form an active hydration layer over the fiber surface. The hydration layer is a barrier created by the fiber surface through interaction with water molecules via hydrogen bonds. ,, The layer would oppose the penetration of the oil droplet through the membrane, providing anti-oil adhesion property with underwater oleophobic behavior. As shown in Figure G, the oil droplets retreated themselves and collided with each other resulting into demulsification.…”

Section: Resultsmentioning

confidence: 99%

Pickering Emulsion-Templated Nanocomposite Membranes for Excellent Demulsification and Oil–Water Separation

Gurave

Dubey

Nandan

et al. 2022

ACS Appl. Mater. Interfaces

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A worldwide steady increase in oily wastewater, due to oil spillage and various industrial discharges, requires immediate efforts toward development of an effective strategy and materials to preserve the natural water bodies. Designing a superwettable fibrous membrane of robust structure and anti-fouling property for efficient separation of oil-water mixtures and emulsions is therefore highly demanding. The electrospun fibrous membrane, which possesses porosity and flexibility and properties including superwettability and tunable functionality, can be considered as apposite materials for this cause. In this approach, we combined two strategies, viz., Pickering emulsion and near gel resin (nGR) emulsion electrospinning together to produce a fibrous nanocomposite membrane for efficient oil−water separation and demulsification. nGR Pickering emulsions were stabilized using hydrophilic SiO 2 nanoparticles and successfully optimized for fabricating the crosslinked core sheath-structured fibrous membrane. The prepared membrane provided twofold functionality due to the core sheath structure of the fibers. The crosslinked polystyrene core offered high oil adsorption capacity, whereas SiO 2 -functionalized crosslinked polyvinyl alcohol sheath provided a rough, superhydrophilic surface with underwater oleophobic behavior to the membrane. The optimized SiO 2 -Pickering emulsion-templated nanocomposite membrane demonstrated excellent underwater anti-oil adhesion behavior (UWOCA ∼148°) with efficient oil−water separation capacity of more than 99% and separation flux up to 3346 ± 91 L m −2 h −1 . The membrane was evaluated against various oil−water emulsions and found to have a superior separation efficiency. Moreover, excellent anti-oil adhesion property provided the intact membrane, where consistent separation performance was achieved up to 10 separation cycles without any loss. The membrane was used for separation of hot oil−water emulsions and showed no structural disintegration or loss in separation performance when exposed to elevated temperatures. The developed nanocomposite membranes could efficiently be used for separation and demulsification, and their applications can be explored in various other fields including selective sorption, catalysis, and storage in future.

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Section: Resultsmentioning

confidence: 99%

Pickering Emulsion-Templated Nanocomposite Membranes for Excellent Demulsification and Oil–Water Separation

Gurave

Dubey

Nandan

et al. 2022

ACS Appl. Mater. Interfaces

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“…The separation efficiency (

) of the membrane is calculated as the total amount of the oil removed divided by the initial amount of the oil [ 94 , 95 ]:

where

and

are the oil contents in the permeate and feed, respectively, for the hydrophilic and oleophobic membrane used, i.e., water-removing mode. For oil-removing mode,

and

are the water contents in the permeate and feed, respectively, when the hydrophobic and oleophilic membrane is employed.…”

Section: Parameters Of Nanofiber Membrane Affecting the Oil/water Sep...mentioning

confidence: 99%

An Overview of Recent Progress in Nanofiber Membranes for Oily Wastewater Treatment

Sarbatly

Chiam

2022

Nanomaterials

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Oil separation from water becomes a challenging issue in industries, especially when large volumes of stable oil/water emulsion are discharged. The present short review offers an overview of the recent developments in the nanofiber membranes used in oily wastewater treatment. This review notes that nanofiber membranes can efficiently separate the free-floating oil, dispersed oil and emulsified oil droplets. The highly interconnected pore structure nanofiber membrane and its modified wettability can enhance the permeation flux and reduce the fouling. The nanofiber membrane is an efficient separator for liquid–liquid with different densities, which can act as a rejector of either oil or water and a coalescer of oil droplets. The present paper focuses on nanofiber membranes’ production techniques, nanofiber membranes’ modification for flux and separation efficiency improvement, and the future direction of research, especially for practical developments.

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“…Compared with the spectrum of P(MDME-co-HEA), several peaks appeared in the spectrum after the reaction with TEOS and SiO 2 . The asymmetric stretching of Si-O-Si was said to be responsible for the peak at 1097 cm −1 [17,25]. The symmetric stretching of Si-O-Si may be the cause of the peak at 791 cm −1 .…”

Section: Chemical Solvents Resistancementioning

confidence: 99%

“…After PVDF membrane was coated, the water contact angle changed from 110°to 20°, and the hydrophilicity was significantly improved. The flux of the membrane for the mixture of oil and water reached 5,586 l•m −2 •h −1 , and the oil rejection rate reached 99.98% [17]. Tan et al prepared copolymer P(AN-MA) via emulsion polymerization using acrylonitrile (AN) and methyl acrylate (MA) as raw materials.…”

Section: Introductionmentioning

confidence: 99%

High flux durability underwater superoleophobic mesh modified by poly (maleic acid mono-(2-(dimethylamino)-ethyl ester-co-hydroxyethyl acrylate) and nanosilica particles hybrid

Mao

Qiao

Kong

et al. 2022

Mater. Res. Express

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It is difficult to separate oil-polluted water mixtures, which has been considered a global problem. In this study, a simple dip-coating process was used to produce a stainless-steel mesh coated with poly (malaic acid mono-(2-(dimethylamino)-ethyl ester-co-hydroxyethyl acrylate)-tetraethyl orthosilicate-silica (P(MDME-co-HEA)-TEOS-SiO2). The membrane’s shape, chemical composition, separation capabilities, and mechanical properties were carefully examined. The membrane was extremely hydrophilic and extremely oil-phobic underwater due to its rough surface structure and hydrophilic chemical composition. For petroleum ether/water mixture, the separation flux of the membrane reached 224,600 l·m−2·h−1, with a 99.96% separation efficiency. The coated mesh also presented outstanding anti-oil fouling performance. Moreover, it exhibited excellent mechanical resistance and chemical stability.

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Mussel-inspired superhydrophilic membrane constructed on a hydrophilic polymer network for highly efficient oil/water separation

Cited by 60 publications

References 48 publications

Pickering Emulsion-Templated Nanocomposite Membranes for Excellent Demulsification and Oil–Water Separation

Pickering Emulsion-Templated Nanocomposite Membranes for Excellent Demulsification and Oil–Water Separation

An Overview of Recent Progress in Nanofiber Membranes for Oily Wastewater Treatment

High flux durability underwater superoleophobic mesh modified by poly (maleic acid mono-(2-(dimethylamino)-ethyl ester-co-hydroxyethyl acrylate) and nanosilica particles hybrid

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