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Carbon capture by alkaline absorbent using octadecyltrichlorosilane modified PVDF/TiO2 membrane
Why-Ling Tan,Hoi-Fang Tan,Nor Aini Ahmad,Norhaziyana Hamzah,Abdul Latif Ahmada,Choe Peng Leo 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.3
Carbon capture efficiency of membrane gas absorption was improved using a nearly superhydrophobic membrane. This membrane, polyvinylidene fluoride (PVDF) membrane, was blended with TiO2 nanoparticles and post-modified with octadecyltrichloro silane to reduce wetting. Wetting reduction is important to minimize mass transfer resistance in membrane pores during carbon capture. The hydrophilic TiO2 nanoparticles reduced membrane pore size and hydrophobicity in dual bath coagulation, but they offered active sites for silane modification as proven by Fourier-transform infrared spectra to achieve a water contact angle up to 148.8o. A non-wetting surface near to Cassie- Baxter state was formed due to the nano-roughness of TiO2 nanoparticles and hydrophobic functional groups of silane. The modified membrane showed higher CO2 absorption flux in comparison to the neat PVDF membrane, as much as 114% improvement. The modified membrane also achieved faster carbon capture into water. Furthermore, PVDF and PVDF/TiO2 membranes modified with octadecyltrichloro silane in ethanol (volume ratio of 5 : 50) were less affected by NaOH absorbent, displaying great potential for carbon capture and storage using alkaline waste.
Nor Naimah Rosyadah Ahmad,Yang Lee,Mohamad Rezi Abdul Hamid,Tinia Idaty Mohd Ghazi,Rizwan Nasir,Choe Peng Leo,Siaw Paw Koh,Jagadeesh Pasupuleti,Sieh Kiong Tiong 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
Membrane-based separation is a promising technology for hydrogen separation and purification due toits low energy consumption. Conventional membranes, such as polymeric membranes, often suffer frompermeability-selectivity trade-offs weakening their potential for challenging gas separations. Metalorganicframeworks (MOFs) with uniform apertures, high porosities, large internal surface areas, and tunablefunctionalities make them excellent fillers in mixed matrix membranes (MMMs) fabrication forhydrogen separation. This review evaluates current state-of-the-art MMMs performances, explores thechallenges in MMMs fabrication, and discusses current strategies in MOF-based MMMs fabrication andmodification aspects to enhance the membrane performance, specifically for H2/CO2, H2/CH4, and H2/N2 separation. Moreover, the hydrogen separation performance of MOF-based MMMs at elevated temperaturesand pressure and improvement in antiaging and antiplasticization properties are discussed indetail. The outlook and perspectives for MOF-based MMMs for hydrogen separation are also provided. This review offers insight into the potential of MOFs as porous fillers in MMMs fabrication for hydrogenseparation application.