Gravity driven separation of emulsified oil–water mixtures utilizing in situ polymerized superhydrophobic and superoleophilic nanofibrous membranes

Huang, Meiling; Si, Yang; Tang, Xiaomin; Zhu, Zhigao; Liu, Lifang; Zheng, Gang; Luo, Wenjing; Yu, Jianyong

doi:10.1039/c3ta13385k

Cited by 165 publications

(86 citation statements)

References 29 publications

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“…Further, on the laminated membrane surface, GO nanosheets are horizontally aligned, the membrane surface morphology is rather smooth and there is a lack of obvious structure characteristics, which may be important for possessing superwetting properties. [30][31][32][33][34][35][36] In this work, we report a kind of novel GO membrane with a non-laminated microstructure that is completely different from previous GO membranes reported. Herein, the GO membrane was prepared via a one-step sol-gel process using polyethyleneimine (PEI) as the crosslinker to produce randomly assembled GO nanosheets in the membrane rather than laminated stacked, forming a non-laminated microstructure.…”

Section: Introductionmentioning

confidence: 77%

Sol–gel fabrication of a non-laminated graphene oxide membrane for oil/water separation

et al. 2015

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A non-laminated graphene oxide membrane with superhydrophilic and underwater superoleophobic properties was fabricated by sol-gel process for effective oil/water separation. † Electronic Supplementary Information (ESI) available: Porosity calculation, separation apparatus, high magnification top view SEM images of LGM, sliding angle measurement of 1,2-dichloroethane (DCE) droplets on the NLGM in water, separation results for other emulsion systems, SEM images of the NLGM after oil/water emulsion separation performance test, photograph of an underwater oil droplet on the NLGM and simulated underwater drag deformation force tests after oil/water emulsion separation test and element component percentages of GO and the NLGM, and. See A non-laminated graphene oxide membrane crosslinked by polyethyleneimine was prepared via a one-step sol-gel process. In the as-prepared membrane, the GO nanosheets remain disordered as in the sol state to form a randomly arranged GO assembly structure, which results in a much higher flux compared with the general laminated GO membrane prepared via vacuum filtration or spin coating because of the lower flow resistance. Further, this random assembly of GO nanosheets give rise to a hierarchical micro/nanoscale rough structure on the membrane surface. Along with the crosslinking reaction, PEI was grafted onto the GO nanosheets to make them hydrophilic. Combining the hydrophilic surface chemistry with the micro/nanoscale hierarchical surface structure, the non-laminated GO membrane exhibited the desired superhydrophilic and underwater superoleophobic properties. We have tested the membrane to separate a series of surfactant-free and surfactant-stabilized oil-in-water emulsions. A high separation efficiency (>99%) and flux were achieved using only gravity without any extra power, much larger than commerical filtration membranes with similar permeation properties. Moreover, the membrane shows an outstanding antifouling performance for oil droplets and can be recycled easily for long-term use.

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Section: Introductionmentioning

confidence: 77%

Sol–gel fabrication of a non-laminated graphene oxide membrane for oil/water separation

et al. 2015

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“…Additionally, as a worldwide challenge, the separation of emulsified oil-water mixtures is more difficult than that of free oil-water mixtures. [25,26] In our work, the experiment for separating water-in-oil emulsions was also performed using the superhydrophobic and superoleophilic cigarette filters. As shown in Figure 6(a)-(e), when a surfactant-stabilized (span80) water-in-oil (toluene) emulsion was poured into the upper glass tube, emulsion droplets de-emulsified once touching the cigarette filters, and clear toluene instantly passed through the cigarette filters and dropped into the glass tube below.…”

Section: Resultsmentioning

confidence: 99%

One-step fabrication of superhydrophobic and superoleophilic cigarette filters for oil-water separation

Liu

Chen

Yang

et al. 2015

Journal of Adhesion Science and Technology

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To develop a simple and efficient way to recycle used cigarette filters, we report on a one-step method for preparing superhydrophobic and superoleophilic cigarette filters for oil-water separation. The robust coating layer on the surface of the cellulose acetate fiber, along with the inherent rough texture of the cigarette filter, could lead to its surface that displayed superhydrophobicity and superoleophilicity. Water droplets can retain in spherical shapes on the modified cigarette filters, while oils were immediately absorbed by the cigarette filters with high absorption capacity. As a result, free oil-water mixtures were separated with efficiency of above 98.0% by the driving force of gravity, and water-in-oil emulsion was also separated with a promising flux of about 2500 L m −2 h −1 . The purity of oil for the tested emulsion was above 99.96%, indicating extremely high separation efficiency. This method for the fabrication of the superhydrophobic and superoleophilic cigarette filters would be a good candidate for recycling the solid wastes and developing an economic oil-water separation material to meet emerging needs in practical applications.

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“…Effective separation of surfactant stabilized water-in-oil microemulsions was achieved [141]. Only driven by the gravity, this membrane showed high separation efficiency (with an extremely high flux of 892 L·m -2 ·h -1 ), as well as good antifouling properties, thermal stability and durability greater than those of commercial filtration membranes (Figure 12).…”

Section: Promising Applications Of Superhydrophobic Fabricsmentioning

confidence: 99%

Recent Progress in Fabrication and Applications of Superhydrophobic Coating on Cellulose-Based Substrates

et al. 2016

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Multifuntional fabrics with special wettability have attracted a lot of interest in both fundamental research and industry applications over the last two decades. In this review, recent progress of various kinds of approaches and strategies to construct super-antiwetting coating on cellulose-based substrates (fabrics and paper) has been discussed in detail. We focus on the significant applications related to artificial superhydrophobic fabrics with special wettability and controllable adhesion, e.g., oil-water separation, self-cleaning, asymmetric/anisotropic wetting for microfluidic manipulation, air/liquid directional gating, and micro-template for patterning. In addition to the anti-wetting properties and promising applications, particular attention is paid to coating durability and other incorporated functionalities, e.g., air permeability, UV-shielding, photocatalytic self-cleaning, self-healing and patterned antiwetting properties. Finally, the existing difficulties and future prospects of this traditional and developing field are briefly proposed and discussed.

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Gravity driven separation of emulsified oil–water mixtures utilizing in situ polymerized superhydrophobic and superoleophilic nanofibrous membranes

Cited by 165 publications

References 29 publications

Sol–gel fabrication of a non-laminated graphene oxide membrane for oil/water separation

Sol–gel fabrication of a non-laminated graphene oxide membrane for oil/water separation

One-step fabrication of superhydrophobic and superoleophilic cigarette filters for oil-water separation

Recent Progress in Fabrication and Applications of Superhydrophobic Coating on Cellulose-Based Substrates

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