الوصف

Graphene oxide (GO) membranes offer attractive gas separation properties. However, the gas separation mechanism for GO membranes is unclear due to inconsistent permeation and separation results reported in the literature. In this work, pure gas permeation and separation of equimolar (H2/CO2) mixture experiments were conducted on GO membranes made from large GO sheets of different sizes (33 and 17 µm) to understand the gas permeation and separation characteristics of these membranes. At room temperature the permeation of large molecules (CH4, N2 and CO2,) through GO membranes exhibits Knudsen–like diffusion characteristics, with the permeance for the small sheet GO membrane about twice that for the large sheet GO membrane. The smaller gases (H2 and He) exhibit much higher permeance, showing additional transport in additional pathway. The GO membranes show good H2/CO2 …

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