Preparation of graphene oxide/poly(vinyl alcohol) composite membrane and pervaporation performance for ethanol dehydration

Cheng, Xue; Cai, Weibin; Chen, Xiaohan; Shi, Zhen; Li, Jiding

doi:10.1039/c9ra01379b

Cited by 40 publications

(31 citation statements)

References 49 publications

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“…The values of the total mass flux through the membranes are shown in Figure 3. Our values (0.25-1.8 kg m −2 h −1 ) are significantly higher than those reported, for instance, by Hua et al [31] (0.2-0.4 kg m −2 h −1 ) and Cheng et al [48] (0.1-0.45 kg m −2 h −1 ). In fact, only two of the 16 values of flux in Figure 3 are less than 0.45 kg m −2 h −1 .…”

Section: Ethanol-water Mixturescontrasting

confidence: 76%

Effect of Temperature and Branched Crosslinkers on Supported Graphene Oxide Pervaporation Membranes for Ethanol Dehydration

2020

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We describe the performance of graphene oxide (GO) membranes stabilized by crosslinkers and supported on polyethersulfone films in the dehydration of ethanol in a continuous cross-flow pervaporation set-up. We used two crosslinker species with branched structures (humic acid-like substances derived from urban waste and a synthetic hyperbranched polyol). The supported crosslinked GO films were prepared by rod coating on a polyethersulfone ultrafiltration membrane. Pervaporation experiments were carried out at temperatures of 40, 50, 60 and 70 °C. When the feed comprised pure water and ethanol, a much higher flux of water than ethanol was observed at all temperatures through GO films stabilized by the two crosslinkers (humic acid, GO-HAL, and the synthetic hyperbranched polyol, GO-HBPO), indicating the separation ability of these crosslinked membranes. For feed mixtures of water and ethanol, the GO-HAL and GO-HBPO membranes showed good separation performances by producing permeates with a significantly higher water content than the feed at all temperatures.

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Section: Ethanol-water Mixturescontrasting

confidence: 76%

Effect of Temperature and Branched Crosslinkers on Supported Graphene Oxide Pervaporation Membranes for Ethanol Dehydration

2020

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“…The materials must encompass properties such as film-forming ability, high selectivity, higher permeation flux, good mechanical strength, and good shelf life. Research in this direction has shown that hydrophilic materials are always suitable for the dehydration of alcohols, and many such membrane materials have been studied for dehydration of alcohols [ 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Physicochemical Study of B2SA-Grafted Poly(vinyl Alcohol)–Graphene Hybrid Membranes for Dehydration of Bioethanol by Pervaporation

et al. 2021

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Tetraethylorthosilicate (TEOS)-crosslinked poly(vinyl alcohol) (PVA) solution was prepared and treated with benzaldehyde 2 sulphonic sodium salt acid (B2SA) for sulfonation. Different contents of graphene were incorporated into B2SA-grafted PVA–TEOS hybrid membrane to improve the membrane stability, mechanical strength, and overall pervaporation performance of the membranes. Membranes were fabricated using the casting technique. Developed membranes were then analyzed for their physicochemical changes by means of Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscope (SEM), wide-angle X-ray diffraction (WAXD), thermogravimetric analysis (TGA), contact angle analysis (CA), and mechanical strength. The lower d-spacing value observed in WAXD was evidence for the decreased inter-chain distance between the polymer chains. DSC exhibited the enhanced thermal stability of the developed membranes compared to the plane PVA membrane with enhancement in Tg value (106 °C), which was well above the pervaporation experimental temperature. Incorporation of graphene induced higher mechanical strength to the fabricated membranes. Further, the membranes were tested for the pervaporation separation of bioethanol. All the membranes were stable throughout the pervaporation studies, with M-2 G showing the total permeation flux of 11.66 × 10−2 kg/(m2 h) at 30 °C.

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“…On increasing the temperature, the increased free volume in the membrane resulted in the permeation of both components across the membrane; therefore, the ux increased and the separation factor decreased. 34,42 The temperature dependence of ux can be expressed by the Arrhenius-type relationship show in eqn (5). 39,43…”

Section: Effect Of Operating Conditionsmentioning

confidence: 99%

Hydrophilic and organophilic pervaporation of industrially important α,β and α,ω-diols

et al. 2021

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Preparation of graphene oxide/poly(vinyl alcohol) composite membrane and pervaporation performance for ethanol dehydration

Abstract: The separation factor of the composite GOP-2.0 membranes could reach 3 059, which is 16 times higher than PVA membranes.

Cited by 40 publications

References 49 publications

Effect of Temperature and Branched Crosslinkers on Supported Graphene Oxide Pervaporation Membranes for Ethanol Dehydration

Effect of Temperature and Branched Crosslinkers on Supported Graphene Oxide Pervaporation Membranes for Ethanol Dehydration

Fabrication and Physicochemical Study of B2SA-Grafted Poly(vinyl Alcohol)–Graphene Hybrid Membranes for Dehydration of Bioethanol by Pervaporation

Hydrophilic and organophilic pervaporation of industrially important α,β and α,ω-diols

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