Current technologies for capturing carbon from flue gas are plagued by high capital, energy and chemical costs, etc. Here, we report a composite supported liquid membrane containing mimic enzyme that may provide a possible solution to these issues. This composite membrane has two highly permeable silicone layers which immobilize the mimic enzyme (Zn-cyclen complex) solution in the pores of a cellulose acetate nanofiltration membrane. The schematic is showed in Fig.1. The membrane couples the selectivity of liquid sorbents and energy-efficiency of membrane separation without absorbent regeneration unit. The prepared Zn-cyclen complex was characterized by 1HNMR and dissociation constant (pKa). The contact angles of the cellulose acetate support membrane and the prepared composite membrane were tested. CO2 separation performances of the membranes were studied in a plate-and-frame membrane module system. The membrane system presents a CO2/N2 selectivity of 94 and a CO2 permeance of 1.33 [m3 (STP)/(m2 bar h)] with a very small amount of 0.0052 M mimic enzyme. This composite supported liquid membrane shows the advantages of low cost, simple production procedure and high CO2 separation performance.
Keywords CO2 capture, Post combustion, Composite supported liquid membrane, Mimic enzyme, hydrophobic photopolymerizable silicone