Effect of microstructure of graphene oxide fabricated through different self-assembly techniques on 1-butanol dehydration

Tsou, Chi‐Hui; An, Quan‐Fu; Lo, Shen–Chuan; Guzman, Manuel Reyes De; Hung, Wei‐Song; Hu, Chien‐Chieh; Lee, Kueir‐Rarn; Lai, Juin‐Yih

doi:10.1016/j.memsci.2014.12.039

Cited by 297 publications

(127 citation statements)

References 47 publications

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“…3(a-h) show the SEM images of the top surfaces and the crosssections of the flat sheet GO membranes prepared by all these methods. They showed similar top surface morphology with wrinkles on the membrane surface, which were also commonly observed in GO membranes from previous studies [20,21,24]. From the cross-sections, GO membranes showed a uniform laminar structure attaching closely on the PES substrates.…”

Section: Water Flux Reduction In Go Membranessupporting

confidence: 81%

“…All of them had a smooth surface though GO membranes prepared by evaporation and dip-coating had slightly uneven coatings which could be due to the uncontrolled evaporation or drying process. In a study reported by Tsou et al, peeling off of GO flakes was observed in GO membranes prepared by an evaporation method [24]. However, that did not happen in our study when GO membranes were prepared using the evaporation method at 80°C.…”

Section: Water Flux Reduction In Go Membranescontrasting

confidence: 79%

“…Though the characteristic interlayer space of GO membranes is important in determining the separation properties of the membranes [15], the microstructures of GO membranes such as the stacking or self-assembly of GO flakes and laminae, and the alignment of defects within membranes, have a significant influence on the performance of the membranes [13]. The microstructure of GO membranes was shown to be affected by the membrane preparation methods used [13,24]. However, it is still unclear to what extent the microstructure will affect the permeation flux, and this has prevented us from understanding the transport in GO laminar structures.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic microstructure of graphene oxide membranes and the permeation flux

Chong

Wang

Mattevi

et al. 2018

Journal of Membrane Science

112

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A B S T R A C TGraphene oxide (GO) membranes have been reported to be a promising separation barrier that can retain small molecules and multi-valent salts because of the well-defined interlayer space between GO flakes. However, while some studies suggested fast liquid transport through the extremely tortuous transport path, contradictory observations (e.g. low permeation flux) have also been obtained. This paper revealed the dynamic microstructure of GO membranes, which affected the membrane performance significantly. We showed that all GO membranes prepared by varied methods and on different substrates presented a severe reduction in water permeability during filtration, due to the compaction of their original loose microstructure. The water flux could drop continuously from tens of LMH bar −1 to < 0.1 LMH bar −1 after more than ten hours. This result demonstrated that the structure of GO membranes prepared by current approaches was far from the ideal laminar structure. The high permeability of GO membranes observed could be contributed by the disordered membrane microstructure. Therefore, the transport mechanisms assuming perfect laminar structure in GO membranes, and the fast transport hypothesis may not fully describe the water transport in GO membranes. Interestingly, the loosely packed microstructure of GO membranes was also found reversible depending on the storage conditions.

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Section: Water Flux Reduction In Go Membranessupporting

confidence: 81%

Section: Water Flux Reduction In Go Membranescontrasting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

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Dynamic microstructure of graphene oxide membranes and the permeation flux

Chong

Wang

Mattevi

et al. 2018

Journal of Membrane Science

112

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“…Another paper by Hung et al [156] investigated dehydration of 1-butanol by composite membranes of GO on a polyacrylonitrile (PAN) support. Butanol dehydration was also studied by Chen et al [157] using GO membranes on anodic aluminium oxide discs, and Tsou et al [158] with GO membranes on a modified PAN support. Liang et al [159] explored the potential of pervaporation with GO/PAN composite membranes for desalination.…”

Section: Applications Of Graphene and Graphene Oxidementioning

confidence: 99%

The potential of polymers of intrinsic microporosity (PIMs) and PIM/graphene composites for pervaporation membranes

et al. 2019

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Pervaporation (PV), a membrane process in which the feed is a liquid mixture and the permeate is removed as a vapour, offers an energy-efficient alternative to conventional separation processes such as distillation, and can be applied to mixtures that are difficult to separate, such as azeotropes. Here the principles of pervaporation and its industrial applications are outlined. Two classes of material that show promise for use in PV membranes are described: Polymers of intrinsic microporosity (PIMs) and 2D materials such as graphene. The literature regarding PV utilizing the prototypical PIM (PIM-1) and it hydrophilic hydrolysed form (cPIM-1) is reviewed. Self-standing PIM-1 membranes give competitive results compared to other membranes reported in the literature for the separation of alcohols and other volatile organic compounds from aqueous solution, and for organic/organic separations such as methanol/ethylene glycol and dimethyl carbonate/methanol mixtures. Blends of cPIM-1 with conventional polymers improve the flux for dehydration of alcohols. The incorporation of fillers, such as functionalised graphene-like fillers, into PIM-1 to form mixed matrix membranes can enhance the separation performance. Thin film composite (TFC) membranes enable very high fluxes to be achieved when a suitable support with high surface porosity is utilised. When functionalised graphene-like fillers are introduced into the selective layer of a TFC membrane, the lateral size of the flakes needs to be carefully controlled. There is a wide range of PIMs and 2D materials yet to be explored for PV applications, which offer potential to create bespoke membranes for a wide variety of organic/aqueous and organic/organic separations.

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“…To produce the membranes, each of the prepared base r-GO solution (25 mL) was filtered, by vacuum filtration, on a 0.22 Millipore membrane filter placed into a Buchner filter (diameter 4.8 cm), as reported in literature [19][20][21] and schematized in Fig. 3.…”

Section: Production Of the Membranesmentioning

confidence: 99%

Preparation and characterization of graphene oxide based membranes as possible Gas Diffusion Layers for PEM fuel cells with enhanced surface homogeneity

Migliavacca

Latorrata

Stampino

et al. 2017

Materials Today: Proceedings

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The aim of this work is to define and optimize a process to produce a membrane made of reduced graphene oxide, r-GO, aiming to use it as Gas Diffusion Layer, GDL, in a Polymer Electrolyte Membrane Fuel Cell, PEMFC. Some works have reported that r-GO could reach conductivity values of about 10 4 S/m; by using the "self-assembling" properties of GO, it would be possible to obtain a GDL with enhanced homogeneity, which maintains a good electronic conductivity. A reduction process of GO in aqueous solution was developed in order to get the desired conductivity value of the final product. The membrane was characterized through several techniques to assess key parameters and to understand its properties. In this work it was possible to obtain a membrane which has a maximum contact angle of 86° and a conductivity of about 421 S/m.

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Effect of microstructure of graphene oxide fabricated through different self-assembly techniques on 1-butanol dehydration

Cited by 297 publications

References 47 publications

Dynamic microstructure of graphene oxide membranes and the permeation flux

Dynamic microstructure of graphene oxide membranes and the permeation flux

The potential of polymers of intrinsic microporosity (PIMs) and PIM/graphene composites for pervaporation membranes

Preparation and characterization of graphene oxide based membranes as possible Gas Diffusion Layers for PEM fuel cells with enhanced surface homogeneity

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