Synthesis and Preparation of Asymmetric PVDF-co-PTFE/DES Supported Membrane for CO2/N2 Separation

[摘要] Incorporation liquid into membrane polymer pores structure would overcome challenges in developing a membrane with increasing gas permeability while maintaining the excellent selectivity. Asymmetric Polyvinylidene fluoride-co-polytetrafluoroethylene (PVDF-co-PTFE) and PVDF-co-PTFE/Deep Eutectic Solvent (PVDF-co-PTFE/DES) supported membrane was prepared using phase inversion method. Membranes prepared were coated with 3 wt. % of polydimethylsiloxane (PDMS) in n-hexane and were dried in a room temperature. While, deep eutectic solvent (DES) was prepared by mixing choline chloride and ethylene glycol with a ratio of 1:3. The membranes was characterized using scanning electron microscopy (SEM), fourier transform infrared (FTIR) and gravimetric methodology to determine the membrane porosity. The membrane performance was carried out using gas permeation test at 3.5 psi. FTIR spectra revealed that existence of DES in the membrane pore structures. Empty PVDF-co-PTFE membrane coated with PDMS shows CO2 permeance at 12 × 103 GPU with CO2/N2 selectivity at 0.72. Interestingly, incorporation of DES showing an improvement for both CO2 permeance and CO2/N2 selectivity up to 49% and 36% respectively. Thus, employing DES as a liquid filler into PVDF-co-PTFE matrix shows a promising membrane for CO2/N2 separation.

[发布机构] School of Bioprocess Engineering, Universiti Malaysia Perlis, Perlis, Arau; 02600, Malaysia^1;School of Material Engineering, Universiti Malaysia Perlis, Perlis, Arau; 02600, Malaysia^2

[效力级别] 工业技术 [学科分类] 工业工程学

[关键词] Deep eutectic solvents;Fourier transform infrared;Gas permeation tests;Membrane performance;Phase-inversion method;Polydimethylsiloxane PDMS;Polyvinylidene fluorides;Supported membrane