Preparation of smart and reversible wettability cellulose fabrics for oil/water separation using a facile and economical method

Fan, Tao; Qian, Qinghe; Hou, Zhihui; Liu, Yiping; Lü, Ming

doi:10.1016/j.carbpol.2018.07.040

Cited by 60 publications

(18 citation statements)

References 52 publications

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“…In the studies above, irreversible superhydrophobic surfaces were developed and shown to be extremely efficient. However, in a very recent study, a reversible superhydrophobic/superoleophilicsuperhydrophilic/superoleophobic transition of modified cellulose fabric was developed and designed by Fan et al [55]. Smart or transition-reversible superhydrophobic-superhydrophilic cellulose fabric was formed by introducing the fabric into an aqueous solution of sodium hydroxide, distilled water and urea for a specific period of time after which it was treated in a zinc chloride aqueous solution to allow zinc cations and chlorine anions be absorbed onto the surface of the cellulose fibers.…”

Section: Cellulose Nanocrystals In Wettable Applicationsmentioning

confidence: 99%

“…Likewise, in Figure 7e, the schematic demonstrates the step taken in achieving this process. Readers should refer to the published work for a well detailed experimental procedure and for more information as needed [55]. It was found that the reversable wettability of the modified cellulose fibric maintained its properties such as separation efficiency and wettability phases even after 20 reversal cycles between hydrophobicity and hydrophilicity.…”

Section: Cellulose Nanocrystals In Wettable Applicationsmentioning

confidence: 99%

“…ACS publications copyright © 2016 and (d) schematic of plausible chemical reactions to achieve superhydrophobic/superhydrophilic surfaces. Reproduced with permission from Fan et al[55]. Elsevier copyright © 2018.…”

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confidence: 99%

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Trends in Advanced Functional Material Applications of Nanocellulose

2018

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The need to transition to more sustainable and renewable technology has resulted in a focus on cellulose nanofibrils (CNFs) and nanocrystals (CNCs) as one of the materials of the future with potential for replacing currently used synthetic materials. Its abundance and bio-derived source make it attractive and sought after as well. CNFs and CNCs are naturally hydrophilic due to the abundance of -OH group on their surface which makes them an excellent recipient for applications in the medical industry. However, the hydrophilicity is a deterrent to many other industries, subsequently limiting their application scope. In either light, the increased rate of progress using CNCs in advanced materials applications are well underway and is becoming applicable on an industrial scale. Therefore, this review explores the current modification platforms and processes of nanocellulose directly as functional materials and as carriers/substrates of other functional materials for advanced materials applications. Niche functional attributes such as superhydrophobicity, barrier, electrical, and antimicrobial properties are reviewed due to the focus and significance of such attributes in industrial applications.

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Section: Cellulose Nanocrystals In Wettable Applicationsmentioning

confidence: 99%

Section: Cellulose Nanocrystals In Wettable Applicationsmentioning

confidence: 99%

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Trends in Advanced Functional Material Applications of Nanocellulose

2018

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“…At -12 o C, the fabric (Scheme 1c-) was treated with 7wt% NaOH/12wt% urea aqueous solution for two hours. NaOH destroyed the intramolecular and intermolecular hydrogen bonds of cellulose, causing cellulose to swell and even partially dissolve (Scheme 1c-) (Cai and Zhang 2005;Fan et al 2018). At the same time, hydroxide ions, sodium ions, and alkali cellulose macromolecules constituted internal ionic system of cotton bers, also called as an intramembrane system (Scheme 1c-).…”

Section: Preparation Of J-mh@cf Membranementioning

confidence: 99%

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

et al. 2021

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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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“…22 Thus, there is an ongoing effort to develop environment-friendly amphiphilic membranes for efficient oil/water separation due to their differential wettability, high flux, and excellent selectivity. 17,[22][23][24][25][26][27] The amphiphilic membrane can simultaneously act as superamphiphilic in air, oleophobic underwater, and hydrophobic under oil which makes them suitable for a broader range of water-oil mixtures.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical amphiphilic high‐efficiency oil–water separation membranes from fermentation derived cellulose and recycled polystyrene

Raghavan

Khandelwal

2020

J of Applied Polymer Sci

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A high-efficiency separation of oil and water can be achieved by using specially designed amphiphilic porous membrane. However, the preparation of such membranes often involves complex multistep chemical processes. Herein, we report an amphiphilic composite membrane (polystyrene [PS]/bacterial cellulose [BC] membrane) consisting of hydrophobic recycled PS and hydrophilic BC, fabricated by a facile in situ fermentation process. Not only these membranes exhibit a combination of contrasting wettability but also comprise of a hierarchical network of microfibers and nanofibers, which makes them ideal for oil-water separation. The structural and morphological properties of asproduced BC, recycled PS membrane, and PS/BC composite membrane were studied by Fourier transform infrared spectroscopy and scanning electron microscopy, respectively. The ability of the membranes to separate oil and water was tested by using an emulsion of hexane-in-water as the feed and the collected filtrates were characterized by optical microscopy and UV-Vis spectroscopy. PS membranes were unable to separate oil and water, while the PS/BC membrane efficiently separated water from the emulsion. PS/BC composite membranes showed a high water recovery of more than 90%, against only 57% recovery shown by BC. Mechanisms of oil-water separation for each membrane are discussed. The reusability of the PS/BC composite membrane was also demonstrated.

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Preparation of smart and reversible wettability cellulose fabrics for oil/water separation using a facile and economical method

Cited by 60 publications

References 52 publications

Trends in Advanced Functional Material Applications of Nanocellulose

Trends in Advanced Functional Material Applications of Nanocellulose

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

Hierarchical amphiphilic high‐efficiency oil–water separation membranes from fermentation derived cellulose and recycled polystyrene

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