Nanoporous graphene oxide membrane and its application in molecular sieving

Abstract

Gas transport through graphene-derived membranes has gained much interest recently due to its promising potential in filtration and separation applications. In this work, we explore Kr-85 gas radionuclide sequestration from natural air in nanoporous graphene oxide membranes in which different sizes and geometries of pores were modeled on the graphene oxide sheet. This was done using atomistic simulations considering mean-squared displacement, diffusion coefficient, number of crossed species of gases through nanoporous graphene oxide, and flow through interlayer galleries. The results showed that the gas features have the densest adsorbed zone in nanoporous graphene oxide, compared with a graphene membrane, and that graphene oxide was more favorable than graphene for Kr separation. The aim of this paper is to show that for the well-defined pore size called P-7, it is possible to separate Kr-85 from a gas mixture containing Kr-85, O 2 and N 2 . The results would benefit the oil industry among others.

Application of Carbon Nanotubes in Chiral and Achiral Separations of Pharmaceuticals, Biologics and Chemicals

“…Therefore, it was not surprising to find that A eluted after T as the molecular size of adenine is larger than that of thymine. The potential molecular sieving properties of carbon nanotubes and graphene has been recently reported [139,140]. When TX100 0.1mM was added as a surfactant to keep c-MWCNTs suspended in the buffer system, adenine and thymine eluted at much earlier time compared to c-MWCNT in buffer solution in the absence of TX-100.…”

“…These aggregations may occur due to the Van der Waals attractions among isolated CNTs and hydrogen bonding sites of the carboxylic groups attached to cSWCNTs. Analytes of different pore sizes pass through these aggregates in the separation process which indicates the role of CNTs in the formation of network-like structures and hence the separation of analytes [139,140].. It is believed that the tubule structure of SWCNT also plays a significant role in the separation process in CE [139,140]..…”

“…It is believed that the presence of c-SWCNTs in the buffer solution offers additional interaction sites with the analytes by forming an aggregation like a network with high surface area and molecular sieving properties [76]. The potential molecular sieving properties of carbon nanotubes and graphene has been recently reported [139,140]. These aggregations may occur due to the Van der Waals attractions among isolated CNTs and hydrogen bonding sites of the carboxylic groups attached to cSWCNTs.…”

Effect of porosity on the mechanical properties of a nanoporous graphene membrane using the atomic-scale finite element method

“…This is because such materials have numerous potential applications in a variety of technological fields and processes such as water purification [1,2], molecular sieving [3,4], gas separation [5,6], and DNA sequencing [7,8].…”

Laminated, Composite and Sandwich Membranes Based on Graphene-Oxide with Nano-Textiles

“…Membranes based on graphene, GO, rGO are applied in the area of molecular separation, both in selective separation of gases, ions, small and ultra-small particles, desalination and purification of water, including disinfection [4,6,7,[12][13][14][15][16][17]. [9,[20][21][22][23]. Graphene-based films have been finding application thanks to their filtering capabilities, as well as other application as adsorption materials, battery electrodes, super-capacitors, photo-catalysis, antibacterial materials and moisture sensors, organic and biological substances.…”