Bio-mimetic oxygen separation via a hollow fiber membrane contactor with O carrier solutions.

A low-cost poly(ethyleneimine)-cobalt (PEI-Co) complex solution with high O2 absorption capacity (as high as 1.5 L O2 (STP)/L solution) was developed and used in a bio-mimetic system to produce high-purity O2 from air. An oxygen concentration greater than 99.

Single- to Few-Layered, Graphene-Based Separation Membranes.

Two-dimensional, graphene-based materials have attracted great attention as a new membrane building block, primarily owing to their potential to make the thinnest possible membranes and thus provide the highest permeance for effective sieving, assuming comparable porosity to conventional membranes and uniform molecular-sized pores. However, a great challenge exists to fabricate large-area, single-layered graphene or graphene oxide (GO) membranes that have negligible undesired transport pathways, such as grain boundaries, tears, and cracks. Therefore, model systems, such as a single flake or nanochannels between graphene or GO flakes, have been studied via both simulations and experiments to explore the transport mechanisms and separation potential of graphene-based membranes.

Ultrathin graphene oxide-based hollow fiber membranes with brush-like CO-philic agent for highly efficient CO capture.

Among the current CO capture technologies, membrane gas separation has many inherent advantages over other conventional techniques. However, fabricating gas separation membranes with both high CO permeance and high CO/N selectivity, especially under wet conditions, is a challenge. In this study, sub-20-nm thick, layered graphene oxide (GO)-based hollow fiber membranes with grafted, brush-like CO-philic agent alternating between GO layers are prepared by a facile coating process for highly efficient CO/N separation under wet conditions.

Evaluation of Removal Mechanisms in a Graphene Oxide-Coated Ceramic Ultrafiltration Membrane for Retention of Natural Organic Matter, Pharmaceuticals, and Inorganic Salts.

Functionalized graphene oxide (GO), derived from pure graphite via the modified Hummer method, was used to modify commercially available ceramic ultrafiltration membranes using the vacuum method. The modified ceramic membrane functionalized with GO (ceramic) was characterized using a variety of analysis techniques and exhibited higher hydrophilicity and increased negative charge compared with the pristine ceramic membrane. Although the pure water permeability of the ceramic membrane (14.