Antifouling hydrolyzed polyacrylonitrile/graphene oxide membrane with spindle-knotted structure for highly effective separation of oil-water emulsion

Zhang, Jianqiang; Pan, Xin; Xue, Qingzhong; He, Daliang; Zhu, Lei; Guo, Qikai

doi:10.1016/j.memsci.2017.03.004

Cited by 182 publications

(74 citation statements)

References 37 publications

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“…Most recently, more attention has been paid to the research on electrospun fibrous separation membranes because of their high porosity, high surface area, and easily tunable structures, which make them exceptional candidates for oil/water separation with high permeation fluxes under lower driving pressures . Till now, a few works have been performed via directly regulating the surface wettability of as‐spun fibrous membranes, but most of the obtained superwettable membranes are solely effective in separating immiscible oil/water mixtures (free oil) or emulsions with larger droplets and are incapable of treating the highly emulsified oil/water emulsions due to their relatively large pore size . To further improve the separation efficiency, a series of polymeric solid films were constructed on the surface of conventional electrospun membranes, but they resulted in a rapid decline in the permeation fluxes due to the low porosity of the obtained composite membranes .…”

Section: Introductionmentioning

confidence: 99%

Biomimetic and Superwettable Nanofibrous Skins for Highly Efficient Separation of Oil‐in‐Water Emulsions

Zong

Jin

et al. 2018

Adv Funct Materials

586

263

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Developing a feasible and efficient separation membrane for the purification of highly emulsified oily wastewater is of significance but challenging due to the critical limitations of low flux and serious membrane fouling. Herein, a biomimetic and superwettable nanofibrous skin on an electrospun fibrous membrane via a facile strategy of synchronous electrospraying and electrospinning is created. The obtained nanofibrous skin possesses a lotus‐leaf‐like micro/nanostructured surface with intriguing superhydrophilicity and underwater superoleophobicity, which are due to the synergistic effect of the hierarchical roughness and hydrophilic polymeric matrix. The ultrathin, high porosity, sub‐micrometer porous skin layer results in the composite nanofibrous membranes exhibiting superior performances for separating both highly emulsified surfactant‐free and surfactant‐stabilized oil‐in‐water emulsions. An ultrahigh permeation flux of up to 5152 L m−2 h−1 with a separation efficiency of >99.93% is obtained solely under the driving of gravity (≈1 kPa), which was one order of magnitude higher than that of conventional filtration membranes with similar separation properties, showing significant applicability for energy‐saving filtration. Moreover, with the advantage of an excellent antioil fouling property, the membrane exhibits robust reusability for long‐term separation, which is promising for large‐scale oily wastewater remediation.

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Section: Introductionmentioning

confidence: 99%

Biomimetic and Superwettable Nanofibrous Skins for Highly Efficient Separation of Oil‐in‐Water Emulsions

Zong

Jin

et al. 2018

Adv Funct Materials

586

263

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“…We know that a membrane's surface hydrophilicity, roughness, structures, and charge can impact the membrane's antifouling properties . Among these factors, surface hydrophilicity is the most important factor: the liquid layer generated on the membrane's hydrophilic top surface prevents the deposition and adsorption of colloids, particles, protein, and so on . Therefore, specific strategies should be pursued to increase the membrane's hydrophilicity.…”

Section: Introductionmentioning

confidence: 99%

Inorganic nanoparticles incorporated in polyacrylonitrile‐based mixed matrix membranes for hydrophilic, ultrafast, and fouling‐resistant ultrafiltration

Liu

Pan

et al. 2019

J of Applied Polymer Sci

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Mixed matrix membrane (MMM) structures and performances are greatly affected by the distribution of nanoparticles in the polymeric matrix. Until now, there has been little research on the effects of nanoparticle distribution states on polyacrylonitrile (PAN)‐based MMM structures and performances. In this paper, different intermolecular interactions between nanoparticles and PAN molecules were generated by in situ fabricated amino‐functionalized SiO2 and TiO2 nanoparticles to create absolutely different distribution states of nanoparticles in a PAN matrix. The results indicated that, due to the strong interactions between amino and cyano groups, SiO2 is distributed in the PAN membranes homogeneously, while most of the TiO2 migrates to the membrane's top surfaces or the walls of pores or even escape from the membranes during the nonsolvent index phase separation (NIPS) process. PAN‐TiO2 MMMs have more hydrophilic top surfaces, higher porosity, larger mean pore size, and stronger antifouling performances than pure PAN and PAN‐SiO2 membranes. The PAN‐TiO2 MMMs have an ultrahigh water flux of 1204.6 L/(m2 h), which is more than 44 times that of PAN membranes. And the good pore structures and hydrophilicity of the membranes derived from special interactions between in situ TiO2 nanoparticles and PAN molecules can give high‐performance PAN‐based ultrafiltration membranes a bright future. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47902.

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“…With increasing filler loading,M WCNTsp rovided more transportc hannels to improvet he gas permeability, while the agglomeration of GONRs shell occurreda t2wt % loading as shown in Figure 5h,w hich caused the decreasing selectivity and might enhanceg as permeability as reported. [5] So Pebax-MWCNT@GONRs-1e xhibited the best performance with aC O 2 /N 2 selectivity of 80.4 (CO 2 permeabilityo f1 78.9 Barrer)a nd aC O 2 /CH 4 selectivity of 23.3 (CO 2 permeability of 180.1 Barrer). Therefore, 1wt% MWCNT@GONRs loading was chosen as the optimal loading in MMMs fort he furthers tudy of gas permeation performance.…”

Section: Separation Performance Of Membranesmentioning

confidence: 94%

“…[1] CO 2 capture and storage (CCS), as ap otentialm ethod to reduce CO 2 emissions, has been receiving tremendous attention.C ompared with traditional separation technologies( cryogenic separation and pressure swing adsorption), membrane-based separation hasb een considered to be ap rospective alternative to fulfill CCS due to its inherent advantages such as high energy efficiency,l ow cost and scaleup simplicity. [2,3] Nowadays,m assive polymeric materials are appliedw idely to membrane-based separation, such as polyimides, [4] polyacrylonitrile, [5] polycarbonates, [6] poly(ethylene oxides). [7] However,t hese polymeric membranes suffer from the trade-off limitation between gas permeability and selectivity.…”

Section: Introductionmentioning

confidence: 99%

Mixed Matrix Membranes with Excellent CO₂ Capture Induced by Nano‐Carbon Hybrids

Pan

Zhang

et al. 2017

ChemNanoMat

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1 D multi‐walled carbon nanotube/graphene oxide nanoribbon (MWCNT@GONRs) hybrids were prepared using a chemical method as fillers for Pebax‐based mixed matrix membranes (MMMs) with excellent CO2 separation performance. Herein, the GONRs shell provided a selective barrier and large gas adsorption area, which contributed to enhancement of gas selectivity, while MWCNTs core with smooth internal surface acted as a rapid transport channel, which improved the gas permeability. It is found that MMMs with 1 wt % loading showed the highest separation factor (80 for CO2/N2 and 23 for CO2/CH4) and high CO2 permeability, far surpassing the upper bound line. Therefore, the synergistic effect of the MWCNTs core and GONRs shell in MWCNT@GONRs nanohybrids can effectively enhance the gas‐separation performance of MMMs at low loading. The unique microstructures, ease of synthesis and low filled loading make MWCNT@GONRs promising candidates in post‐combustion and sustainable chemistry.

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Antifouling hydrolyzed polyacrylonitrile/graphene oxide membrane with spindle-knotted structure for highly effective separation of oil-water emulsion

Cited by 182 publications

References 37 publications

Biomimetic and Superwettable Nanofibrous Skins for Highly Efficient Separation of Oil‐in‐Water Emulsions

Biomimetic and Superwettable Nanofibrous Skins for Highly Efficient Separation of Oil‐in‐Water Emulsions

Inorganic nanoparticles incorporated in polyacrylonitrile‐based mixed matrix membranes for hydrophilic, ultrafast, and fouling‐resistant ultrafiltration

Mixed Matrix Membranes with Excellent CO₂ Capture Induced by Nano‐Carbon Hybrids

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Antifouling hydrolyzed polyacrylonitrile/graphene oxide membrane with spindle-knotted structure for highly effective separation of oil-water emulsion

Cited by 182 publications

References 37 publications

Biomimetic and Superwettable Nanofibrous Skins for Highly Efficient Separation of Oil‐in‐Water Emulsions

Biomimetic and Superwettable Nanofibrous Skins for Highly Efficient Separation of Oil‐in‐Water Emulsions

Inorganic nanoparticles incorporated in polyacrylonitrile‐based mixed matrix membranes for hydrophilic, ultrafast, and fouling‐resistant ultrafiltration

Mixed Matrix Membranes with Excellent CO2 Capture Induced by Nano‐Carbon Hybrids

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Product

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Mixed Matrix Membranes with Excellent CO₂ Capture Induced by Nano‐Carbon Hybrids