In this study,Pebax■2533 polymer was used as the continuous phase and UiO-67 was employed as the filler to prepare mixed matrix membranes.UiO-67 is usually synthesized using two ligands:biphenyl-4,4'-dicarboxylat...In this study,Pebax■2533 polymer was used as the continuous phase and UiO-67 was employed as the filler to prepare mixed matrix membranes.UiO-67 is usually synthesized using two ligands:biphenyl-4,4'-dicarboxylate(bpdc)and 2,2'-bipyridine-5,5'-dicarboxylic acid(bpy).In this research,UiO-67 was synthesized not only with these two ligands but also using a mixed ligand approach(50% bpdc and 50% bpy).The synthesized UiOs were incorporated into the polymer matrix at mass percentages ranging from 0% to 2% to form the mixed matrix membranes(MMMs).Membranes containing UiO-67 with mixed ligands exhibited a greater affinity for CO_(2) compared to other membranes.Various analytical techniques,including X-ray diffraction,thermogravimetric analyzer,Fourier transform infrared spectroscope(FTIR),field emission scanning electron micro scope(FESEM),and differential scanning calorimetry,were used to analyze the properties of the prepared membranes.The FTIR spectrum confirmed all desired bands of Pebax?2533 and UiO-67 in the MMMs.The FESEM images showed that the pure Pebax membrane has a uniform structure,and the developed membranes are uniformly incorporated with the synthesized UiO-67 nanoparticles.Gas permeation measurements indicated that CO_(2) permeability and CO_(2)/CH_4 selectivity increased from 402.7 Barrer(1 Barrer=1.33×10^(-14)m^(3)(STP)·m·m^(-2)·s^(-1)·kPa^(-1))and 9.32 for the pure Pebax membrane at 1.0 MPa to 770.1 Barrer and 16.96 in the modified membrane.Additionally,the gas permeation test results demonstrated that adding functionalized porous nanofillers increases the CO_(2)separation performance.Permeability tests at different temperatures revealed that as temperature was raised,at constant pressure,CO_(2) permeability for the membrane containing the mixed ligand increased from 682.2 Barrer to 733.5 Barrer,While CO_(2)/CH_(4) selectivity decreased from 15.46 to 13.43.展开更多
The crisis of excessive increase in CO_(2)emissions has quickly become a serious issue and requires low-cost and bio-compatible solutions.The employee of membrane technology for CO_(2)gas separation has garnered signi...The crisis of excessive increase in CO_(2)emissions has quickly become a serious issue and requires low-cost and bio-compatible solutions.The employee of membrane technology for CO_(2)gas separation has garnered significant interest among researchers.However,this method encounters challenges related to selectivity and permeability.Therefore,modifying and reinforcing the polymer membranes to improve gas separation performance seems essential.Among the various methods for polymer membrane modification,modification with magnesium-based fillers to prepare a mixed matrix membrane(MMM)is considered an efficient method.Owing to magnesium metal's low weight,low density,high strength,and good selectivity,magnesium-based materials(Mg-based materials)have more porosity,higher available surface area,more adsorption sites,lighter weight,and more gas absorption tendency than other fillers,which makes them an attractive choice for the preparation of gas separation MMMs.This research deals with the introduction of Mg-based materials,various methods of synthesis of Mg-based materials,different methods of introducing Mg-based materials into the membrane matrix,and their effect on the performance of MMMs in CO_(2)gas separation applications.Therefore,this review can provide researchers with light horizons in using the high potential of Mg-based materials as efficient fillers in MMMs to achieve excellent permeability and selectivity and generally improve their performance in CO_(2)gas separation applications.展开更多
基金Babol Noshirvani University of Technology for financially support of this project(BNUT/393054/2023)。
文摘In this study,Pebax■2533 polymer was used as the continuous phase and UiO-67 was employed as the filler to prepare mixed matrix membranes.UiO-67 is usually synthesized using two ligands:biphenyl-4,4'-dicarboxylate(bpdc)and 2,2'-bipyridine-5,5'-dicarboxylic acid(bpy).In this research,UiO-67 was synthesized not only with these two ligands but also using a mixed ligand approach(50% bpdc and 50% bpy).The synthesized UiOs were incorporated into the polymer matrix at mass percentages ranging from 0% to 2% to form the mixed matrix membranes(MMMs).Membranes containing UiO-67 with mixed ligands exhibited a greater affinity for CO_(2) compared to other membranes.Various analytical techniques,including X-ray diffraction,thermogravimetric analyzer,Fourier transform infrared spectroscope(FTIR),field emission scanning electron micro scope(FESEM),and differential scanning calorimetry,were used to analyze the properties of the prepared membranes.The FTIR spectrum confirmed all desired bands of Pebax?2533 and UiO-67 in the MMMs.The FESEM images showed that the pure Pebax membrane has a uniform structure,and the developed membranes are uniformly incorporated with the synthesized UiO-67 nanoparticles.Gas permeation measurements indicated that CO_(2) permeability and CO_(2)/CH_4 selectivity increased from 402.7 Barrer(1 Barrer=1.33×10^(-14)m^(3)(STP)·m·m^(-2)·s^(-1)·kPa^(-1))and 9.32 for the pure Pebax membrane at 1.0 MPa to 770.1 Barrer and 16.96 in the modified membrane.Additionally,the gas permeation test results demonstrated that adding functionalized porous nanofillers increases the CO_(2)separation performance.Permeability tests at different temperatures revealed that as temperature was raised,at constant pressure,CO_(2) permeability for the membrane containing the mixed ligand increased from 682.2 Barrer to 733.5 Barrer,While CO_(2)/CH_(4) selectivity decreased from 15.46 to 13.43.
文摘The crisis of excessive increase in CO_(2)emissions has quickly become a serious issue and requires low-cost and bio-compatible solutions.The employee of membrane technology for CO_(2)gas separation has garnered significant interest among researchers.However,this method encounters challenges related to selectivity and permeability.Therefore,modifying and reinforcing the polymer membranes to improve gas separation performance seems essential.Among the various methods for polymer membrane modification,modification with magnesium-based fillers to prepare a mixed matrix membrane(MMM)is considered an efficient method.Owing to magnesium metal's low weight,low density,high strength,and good selectivity,magnesium-based materials(Mg-based materials)have more porosity,higher available surface area,more adsorption sites,lighter weight,and more gas absorption tendency than other fillers,which makes them an attractive choice for the preparation of gas separation MMMs.This research deals with the introduction of Mg-based materials,various methods of synthesis of Mg-based materials,different methods of introducing Mg-based materials into the membrane matrix,and their effect on the performance of MMMs in CO_(2)gas separation applications.Therefore,this review can provide researchers with light horizons in using the high potential of Mg-based materials as efficient fillers in MMMs to achieve excellent permeability and selectivity and generally improve their performance in CO_(2)gas separation applications.
