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Design of Enzyme Loaded W/O Emulsions by Direct Membrane Emulsification for CO2 Capture
Publication . Mondal, Suchintan; Alke, Bhavna; de Castro, Aline Machado; Ortiz-Albo, Paloma; Syed, Usman Taqui; Crespo, João G.; Brazinha, Carla; DQ - Departamento de Química; LAQV@REQUIMTE; MDPI AG
Membrane-based gas separation is a promising unit operation in a low-carbon economy due to its simplicity, ease of operation, reduced energy consumption and portability. A methodology is proposed to immobilise enzymes in stable water-in-oil (W/O) emulsions produced by direct membrane emulsification systems and thereafter impregnated them in the pores of a membrane producing emulsion-based supported liquid membranes. The selected case-study was for biogas (CO2 and CH4) purification. Upon initial CO2 sorption studies, corn oil was chosen as a low-cost and non-toxic bulk phase (oil phase). The emulsions were prepared with Nadir® UP150 P flat-sheet polymeric membranes. The optimised emulsions consisted of 2% Tween 80 (w/w) in corn oil as the continuous phase and 0.5 g.L−1 carbonic anhydrase enzyme with 5% PEG 300 (w/w) in aqueous solution as the dispersed phase. These emulsions were impregnated onto a porous hydrophobic PVDF membrane to prepare a supported liquid membrane for gas separation. Lastly, gas permeability studies indicated that the permeability of CO2 increased by ~15% and that of CH4 decreased by ~60% when compared to the membrane without carbonic anhydrase. Thus, a proof-of-concept for enhancement of CO2 capture using emulsion-based supported liquid membrane was established.
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Fundação para a Ciência e a Tecnologia
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9471 - RIDTI
Número da atribuição
PTDC/EQU-EQU/30763/2017