Superhydrophobic graphene-coated sponge with microcavities for high efficiency oil-in-water emulsion separation

Han, Longxiang; Bi, Hengchang; Xie, Xiaoguang; Shi, Shaobo; Mao, Peng; Sun, Litao

doi:10.1039/d0nr04892e

Cited by 45 publications

(20 citation statements)

References 35 publications

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“…This demands the efficient treatment of oily wastewater prior to releasing it in the environment and for that purpose; strict standards for the oily wastewater discharge are regulated by many countries. Generally, the oil present in wastewater can be: (i) floating oil with the largest droplets among the other types (≥150 μm), (ii) dispersed oil (20–150 μm), (iii) emulsified oil (˂20 μm) and (iv) the dissolved oil or ‘’water-soluble oils’’ such as organic acids and phenol derivatives [ 73 , 74 ]. However, emulsified oil is the most harmful and difficult type to separate.…”

Section: Oil/water Emulsion Separation By Ma and Pu Foamsmentioning

confidence: 99%

“…The foam exhibited 99.9%, 99.96% and 99.91% respective efficiencies for Tween 80 surfactant-stabilized hexane, hexadecane, and soybean in water emulsions. Very recently, Han et al [ 74 ] coated MA with graphene/PDMS composite to prepare a superhydrophobic filtration material. Han’s team used bottom-to-top approach to pass the emulsion through the graphene/PDMS MA foam as shown in Figure 9 .…”

Section: Oil/water Emulsion Separation By Ma and Pu Foamsmentioning

confidence: 99%

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The Separation of Oil/Water Mixtures by Modified Melamine and Polyurethane Foams: A Review

Hailan¹,

Ponnamma²,

Krupa³

2021

Polymers

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Melamine (MA) and polyurethane (PU) foams, including both commercial sponges for daily use as well as newly synthesized foams are known for their high sorption ability of both polar and unipolar liquids. From this reason, commercial sponges are widely used for cleaning as they absorb a large amount of water, oil as well as their mixtures. These sponges do not preferentially absorb any of those components due to their balanced wettability. On the other hand, chemical and physical modifications of outer surfaces or in the bulk of the foams can significantly change their original wettability. These treatments ensure a suitable wettability of foams needed for an efficient water/oil or oil/water separation. MA and PU foams, dependently on the treatment, can be designed for both types of separations. The particular focus of this review is dealt with the separation of oil contaminants dispersed in water of various composition, however, an opposite case, namely a separation of water content from continuous oily phase is also discussed in some extent. In the former case, water is dominant, continuous phase and oil is dispersed within it at various concentrations, dependently on the source of polluted water. For example, waste waters associated with a crude oil, gas, shale gas extraction and oil refineries consist of oily impurities in the range from tens to thousands ppm [mg/L]. The efficient materials for preferential oil sorption should display significantly high hydrophobicity and oleophilicity and vice versa. This review is dealt with the various modifications of MA and PU foams for separating both oil in water and water in oil mixtures by identifying the chemical composition, porosity, morphology, and crosslinking parameters of the materials. Different functionalization strategies and modifications including the surface grafting with various functional species or by adding various nanomaterials in manipulating the surface properties and wettability are thoroughly reviewed. Despite the laboratory tests proved a multiply reuse of the foams, industrial applications are limited due to fouling problems, longer cleaning protocols and mechanical damages during performance cycles. Various strategies were proposed to resolve those bottlenecks, and they are also reviewed in this study.

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Section: Oil/water Emulsion Separation By Ma and Pu Foamsmentioning

confidence: 99%

Section: Oil/water Emulsion Separation By Ma and Pu Foamsmentioning

confidence: 99%

The Separation of Oil/Water Mixtures by Modified Melamine and Polyurethane Foams: A Review

Hailan¹,

Ponnamma²,

Krupa³

2021

Polymers

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“…[4,5] Hence, how to deal with the oily contaminant and purify water have become urgent worldwide problems. [6] There have been three main ways (chemical, biological, and physical methods [7] ) to remove oil from water. Chemical oil-removal options include chemical dispersions and burning, while it is difficult to remove the chemical reagent itself and the burning is easy to produce toxic gas.…”

Section: Introductionmentioning

confidence: 99%

Melamine Foam with pH‐Responsive Wettability for Fast Oil Absorption and Desorption

Xie

Yang

et al. 2022

Adv Materials Inter

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Innovative 3D materials with the switchable wetting surface attract significant attention due to their application in oil/water separation. Herein, a fast pH‐responsive and highly effective melamine foam (MF) grafted with poly (2‐dimethylaminoethyl methacrylate) is prepared by surface‐initiated chain transfer radical polymerization. The as‐prepared MF displays superhydrophilic and superoleophobic surface in strong acid solution while it becomes superhydrophobic in neutral or basic solution. Therefore, it can be rapid to selectively absorb different types of oils from the oil–water mixture with a great absorption capacity of 54–117 g g−1 and automatically desorb oil in less than 60 s with a desorption efficiency of 99% (dichloromethane) in acid solution. Moreover, the as‐prepared MF possesses excellent recyclability, and the absorption capacity and the desorption efficiency are almost unchanged after 15 cycles. The pH‐sensitive MF with switchable wetting surfaces has great potential for the oily water separation.

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“…Many membranes and particles have been tested for the separation and filtration performance in the last years. Ceramics, porous metal materials, hydrophobic synthetic polymers, and biopolymers‐like cellulose nanosheet membranes are ideal candidates for the separation of the water in oil emulsion 11–22 …”

Section: Introductionmentioning

confidence: 99%

“…Ceramics, porous metal materials, hydrophobic synthetic polymers, and biopolymers-like cellulose nanosheet membranes are ideal candidates for the separation of the water in oil emulsion. [11][12][13][14][15][16][17][18][19][20][21][22] To summarize previous efforts and position our work more clearly, we provide (in Table 1) a summary of various aspects incorporated in some relevant literature.…”

Section: Introductionmentioning

confidence: 99%

Influence of deposited amine‐functionalized Si‐MCM‐41 in polyacrylonitrile electrospun membranes applied for separation of water in oil emulsions

Ávila‐Ortega

Avalos‐Hernández

Trejo-Tzab

et al. 2021

J of Applied Polymer Sci

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Among several oil/water emulsion separation technologies, the utilization of nanoparticle‐decorated membranes with diverse functionalities has received considerable attention in recent years, particularly if the antifouling capacity can be improved. In this article, we propose a new membrane based on surface‐hydrolyzed polyacrylonitrile electrospun membranes and/or decorated with amine‐functionalized Si‐MCM‐41 nanoparticles to be used as oil/water emulsion separation treatment and to determine their antifouling ability. X‐Ray photoelectron spectrometry, attenuated total reflectance Fourier transform infrared spectroscopy, and toluidine blue O assay, scanning electron microscopy, contact angle measurements for oil under water and thermogravimetry were used for characterizing the membranes and an assay of permeability was developed to quantify the diffusion of oil molecules across the electrospun membrane. The electrospun and/or decorated membranes showed an underwater oleophobic wettability, which can separate oil‐in‐water emulsions with 87% separation efficiency, results of fouling experiments, evaluated in terms of rejection and flux recovery ratio, exhibited good antifouling ability, but the membrane decoration process did not lead to superior outcomes compared with undecorated membranes.

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Superhydrophobic graphene-coated sponge with microcavities for high efficiency oil-in-water emulsion separation

Abstract: The materials for emulsion separation, with low pressure, high flux, high stability, are of great interest in the treatment of oily wastewater. Herein, we report a facile strategy for the...

Cited by 45 publications

References 35 publications

The Separation of Oil/Water Mixtures by Modified Melamine and Polyurethane Foams: A Review

The Separation of Oil/Water Mixtures by Modified Melamine and Polyurethane Foams: A Review

Melamine Foam with pH‐Responsive Wettability for Fast Oil Absorption and Desorption

Influence of deposited amine‐functionalized Si‐MCM‐41 in polyacrylonitrile electrospun membranes applied for separation of water in oil emulsions

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