Dynamic graphene filters for selective gas-water-oil separation

Abstract

Selective filtration of gas, water, and liquid or gaseous oil is essential to prevent possible environmental pollution and machine/facility malfunction in oil-based industries. Novel materials and structures able to selectively and efficiently filter liquid and vapor in various types of solutions are therefore in continuous demand. Here, we investigate selective gas-water-oil filtration using three-dimensional graphene structures. The proposed approach is based on the adjustable wettability of three-dimensional graphene foams. Three such structures are developed in this study; the first allows gas, oil, and water to pass, the second blocks water only, and the third is exclusively permeable to gas. In addition, the ability of three-dimensional graphene structures with a self-assembled monolayer to selectively filter oil is demonstrated. This methodology has numerous potential practical applications as gas, water, and/or oil filtration is an essential component of many industries.

Reduced graphene oxide-coated cotton as an efficient absorbent in oil-water separation

“…However, it was apparent that after hydrothermal treatment, the soft cotton fiber was uniformly coated with rGO sheets due to the reduction of GO (see Fig. 3d) [50]. High-magnification FESEM image of the rGO@cotton illustrated in Fig.…”

Oil–Water Separation Using Superhydrophobic PET Membranes Fabricated Via Simple Dip‐Coating Of PDMS–SiO2 Nanoparticles

“…Due to the growth of the oil industry and the frequency of oil‐spill accidents, the treatment of oil‐contaminated water is an urgent issue in environmental protection . Superhydrophobic and oleophilic membranes (SOMs) can effectively separate the oil from oil–water mixtures by repelling water while letting oil pass through the membrane . In an environment with excess water contaminated by a smaller amount of oil, such as an oil‐spill in seawater, containers consisting of SOM walls can be used to effectively isolate oil from water .…”

“…In an environment with excess water contaminated by a smaller amount of oil, such as an oil‐spill in seawater, containers consisting of SOM walls can be used to effectively isolate oil from water . Oil–water separation with SOMs consisting of carbon nanotubes (CNT), various polymers or graphene have recently been attempted in many groups . The SOMs are limited in terms of mass production and real applications due to limited cost‐effective target substrates and complex SOM fabrication procedures …”

Graphene Foam as a Three-Dimensional Platform for Myotube Growth

“…GF has already found use in battery and supercapacitor technology and has exhibited potential for hydrophobic coating and filtering applications. 13-16 Additionally, GF is rapidly emerging as a platform for advanced biomedical, biosensing and tissue engineering therapies 17-19 and has already been demonstrated as a biocompatible platform for neural cell growth, osteogenic differentiation, and chondrogenic differentiation. 17,20-21 However, the use of graphene foam as a conductive 3D scaffold for muscle tissue remains unreported.…”