Efficient gas adsorption using superamphiphobic porous monoliths as the under-liquid gas-conductive circuits

ABSTRACT: The gas-liquid membrane contactor forms a gas-solid-liquid interface and has a high potential for the applications in gas adsorption, catalysis, energy exchange and so on. Porous superhydrophobic membranes show a great gas separation/adsorption ability. However, the complicated device architecture and the durability issue are normally concerned especially for the continuous circulation of gas and liquid. In this work, we present a free-standing gas-conductive circuit simply formed by connecting the porous superamphiphobic monoliths (SAPM) to achieve an efficient under-liquid gas adsorption. The porous worm-like SAPM is prepared with low-temperature expandable graphite (LTEG) and polyvinylidenefluoride (PVDF), exhibiting superamphiphobicity and superaerophilicity after fluoridation. The as-made SAPM circuits can be used as a reliable gas conductor under numerous liquids, such as water, alkaline, acidic and oily solutions. In this work, the CO2 adsorption capacities of the SAPM circuits are evalua...