Synthesis of graphene oxide membranes on polyester substrate by spray coating for gas separation

Ibrahim, Amr F. M.; Lin, Youzuo

doi:10.1016/j.ces.2018.06.031

Cited by 69 publications

(31 citation statements)

References 20 publications

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“…Apparently, the main mechanism for large molecules (CH 4 , N 2 , and CO 2 ) is Knudsen diffusion, since the interlayer distance is rather large. This is confirmed by experimental datathe permeability of these gases is inversely proportional to the square root of the molecular weight [89,90,92]. However, the substantially higher permeability for hydrogen and helium indicates that another path contributes additionally.…”

Section: Graphene-based Membranes For the Purification And Concentratsupporting

confidence: 73%

“…Owing to its unique thin-layered structure and the presence of functional groups, membranes based on graphene oxide (GO membranes) can also provide high permeability and selectivity and can be used in practice for hydrogen purification or hydrogen evolution [66,67,73,79,[86][87][88][89][90][91][92][93]. The homogeneous layered structures required to form membranes can be obtained from dispersions of GO flakes by dip coating, vacuum filtration, spray coating, layer-by-layer deposition, and other methods.…”

Section: Graphene-based Membranes For the Purification And Concentratmentioning

confidence: 99%

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Graphene and Graphene-Like Materials for Hydrogen Energy

et al. 2020

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The review is devoted to current and promising areas of application of graphene and materials based on it for generating environmentally friendly hydrogen energy. Analysis of the results of theoretical and experimental studies of hydrogen accumulation in graphene materials confirms the possibility of creating on their basis systems for reversible hydrogen storage, which combine high capacity, stability, and the possibility of rapid hydrogen evolution under conditions acceptable for practical use. Recent advances in the development of chemically and heat-resistant graphene-based membrane materials make it possible to create new gas separation membranes that provide high permeability and selectivity and are promising for hydrogen purification in processes of its production from natural gas. The characteristics of polymer membranes that are currently used in industry for the most part can be significantly improved with small additions of graphene materials. The use of graphene-like materials as a support of nanoparticles or as functional additives in the composition of the electrocatalytic layer in polymer electrolyte membrane fuel cells makes it possible to improve their characteristics and to increase the activity and stability of the electrocatalyst in the reaction of oxygen evolution.

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Section: Graphene-based Membranes For the Purification And Concentratsupporting

confidence: 73%

Section: Graphene-based Membranes For the Purification And Concentratmentioning

confidence: 99%

Graphene and Graphene-Like Materials for Hydrogen Energy

et al. 2020

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“…Membrane separation technology has obtained a great deal of attention for H 2 /CO 2 separation due to the fewer environmental impacts and lower energy costs, compared to conventional industrial methods (e.g., adsorption or cryogenic distillation; Rabiee et al, 2014 ; Liu et al, 2016 ; Wang et al, 2017 ; Ibrahim and Lin, 2018 ). Besides, membrane separation processes can be employed for the capture of CO 2 , while H 2 is subjected to combustion, which is due to a very high permeation rate of H2 relative to most other gases (Fu et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Improving the Selectivity of ZIF-8/Polysulfone-Mixed Matrix Membranes by Polydopamine Modification for H2/CO2 Separation

Mei

Yang

et al. 2020

Front. Chem.

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Gas separation membranes are essential for the capture, storage, and utilization (CSU) of CO 2 , especially for H 2 /CO 2 separation. However, both glassy and rubbery polymer membranes lead a relatively poor selectivity for H 2 /CO 2 separation because the differences in kinetic diameters of these gases are small. The present study establishing the mixed matrix membranes (MMMs) consist of a nano-sized zeolitic imidazolate frameworks (ZIF-8) blended with the polysulfone (PSf) asymmetric membranes. The gas transport properties (H 2 , CO 2 , N 2 , and CH 4) of MMMs with a ZIF-8 loading up to 10 wt% were tested and showing significant improvement on permeance of the light gases (e.g., H 2 and CO 2). Moreover, the depositional polydopamine (PDA) layer further enhanced the ideal H 2 /CO 2 selectivity, and the PDA-modified MMMs approach the Robeson upper bound of H 2 /CO 2 separation membranes. Hence, the PDA post-modification strategy can effectively repair the defects of MMMs and improved the H 2 /CO 2 selectivity.

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“…Os autores demonstraram que múltiplas camadas obtidas por spray apresentaram propriedades satisfatórias para tal fim. IBRAHIM et al (2018) [5], estudaram a produção de filmes de GO por spray coating para separação de gases, demonstrando ser um método eficiente, econômico, escalável e com características muito similares ao método tradicional, que é a filtragem. Nesse caso, o autor utilizou ar comprimido como gás de arraste e o volume de GO depositado para controle da espessura do filme.…”

Section: Introductionunclassified

Análise comparativa de deposições de filmes de óxido de grafeno por spray ultrassônico e convencional

et al. 2020

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RESUMO A técnica de deposição de filmes por spray destaca-se por sua versatilidade, simplicidade e eficiência. Neste trabalho, dois equipamentos de spray distintos foram empregados para produção de filmes de óxido de grafeno: o primeiro, um equipamento industrial para produção por método ultrassônico e o segundo, uma adaptação realizada com um aerógrafo, um solenoide, um circuito elétrico e um programa em linguagem C++, denominado de método convencional. Os filmes obtidos foram caracterizados com respeito à espessura, resistividade elétrica, transmitância e morfologia. As amostras produzidas pelo método convencional apresentaram menores espessuras e maiores transmitâncias, sendo, desse modo, mais adequadas para aplicações optoeletrônicas. Já as menores resistências de folha foram obtidas pelo método de spray ultrassônico. A morfologia dos filmes aponta melhor uniformidade para as amostras obtidas por meio da técnica ultrassônica. A análise comparativa dos resultados indicou que o equipamento convencional, apesar de ser muito mais simples e de baixo custo, foi capaz de alcançar resultados tão satisfatórios quanto os obtidos em um equipamento industrial de spray ultrassônico. A grande vantagem do equipamento industrial está na possibilidade de produção de várias amostras simultaneamente, enquanto o convencional adaptado tem como benefício a rapidez, possibilidade de deposição com folhas de óxido de grafeno maiores e acessibilidade da produção e operação do sistema.

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Synthesis of graphene oxide membranes on polyester substrate by spray coating for gas separation

Cited by 69 publications

References 20 publications

Graphene and Graphene-Like Materials for Hydrogen Energy

Graphene and Graphene-Like Materials for Hydrogen Energy

Improving the Selectivity of ZIF-8/Polysulfone-Mixed Matrix Membranes by Polydopamine Modification for H2/CO2 Separation

Análise comparativa de deposições de filmes de óxido de grafeno por spray ultrassônico e convencional

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