%0 Journal Article
%@ 22147853
%A Chang, P.T.
%A Ng, Q.H.
%A Ahmad, A.L.
%A Oh, P.C.
%A Low, S.C.
%D 2022
%F scholars:17324
%I Elsevier Ltd
%J Materials Today: Proceedings
%K Carbon dioxide; Contact angle; Gas absorption; Gas permeable membranes; Hydrophobicity; Membrane technology; Pore size, Absorption performance; Asymmetric wetting membrane; EDA; Membrane gas absorption; Patterned surface; PDA; Polydopamine; PVDF membrane; Superhydrophobic; Surface wettability, Wetting
%R 10.1016/j.matpr.2022.12.082
%T Development of opposing surface wettability PVDF membrane to improve CO2 capture in membrane gas absorption
%U https://khub.utp.edu.my/scholars/17324/
%X Membrane gas absorption (MGA) is a hybrid CO2 capture technology. However, the membrane wetting problem and the low CO2 permeability membrane constraint the MGA performance. Therefore, the development of PVDF membrane with opposing surface wettability is significant to increase the CO2 absorption performance. In this work, superhydrophobic membrane was first synthesised by templated method. The patterned surface of the membrane (tPVDF) demonstrated water contact angle (WCA) 152° and sliding angle (SA) 8.6°. Then, the opposite surface of the patterned surface was modified with ethylenediamine (tPVDF/EDA) and polydopamine (tPVDF/PDA). From the FTIR analysis, tPVDF/EDA and tPVDF/PDA have successfully deposited with amine and hydroxyl functional groups. By comparing with tPVDF, tPVDF/EDA and tPVDF/PDA showed smaller membrane average pore size of 0.29um and 0.25um respectively. However, the surface porosity of the membranes is almost unchanged at 50  (tPVDF), 48  (tPVDF/EDA) and 47  (tPVDF/PDA). In the MGA performance, tPVDF/EDA and tPVDF/PDA improved CO2 absorption flux to 0.088 and 0.090 mol/m2s respectively from 0.005 mol/m2s. The results indicates that the improvement of MGA performance was mainly due to the NH2 and OH functional groups deposited on the membrane surface that enhanced the membrane affinity to polar CO2 and the superhydrophobic patterned surface inhibited the intrusion of absorbent into membrane pores. The CO2 absorption flux obtained in the work is reasonably good and comparable to the literatures. © 2022 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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