Shafiq Sanaullah, Al-Maythalony Bassem A, Usman Muhammad, Ba-Shammakh Mohammad Saleh, Al-Shammari Abdallah A
Chemical Engineering Department, King Fahad University of Petroleum and Minerals Dhahran 31261 Saudi Arabia
King Abdulaziz City for Science and Technology-Technology Innovation Centre on Carbon Capture and Sequestration (KACST-TIC on CCS) at King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia.
RSC Adv. 2021 Oct 22;11(54):34319-34328. doi: 10.1039/d1ra06271a. eCollection 2021 Oct 18.
Metal-organic frameworks (MOFs) are found to be promising porous crystalline materials for application in gas separation. Considering that mixed matrix membranes usually increase the gas separation performance of a polymer by increasing selectivity, permeability, or both (, perm-selectivity), the zeolitic imidazole framework-95 (ZIF-95) MOF was dispersed for the first time in polysulfone (PSF) polymer to form mixed matrix membranes (MMMs), namely, ZIF-95/PSF. The fabricated ZIF-95/PSF membranes were examined for the separation of various gases. The characterization of solvothermally synthesized ZIF-95 was carried out using different analyses such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), porosity measurements, ZIF-95 was mixed with PSF at 8%, 16%, 24%, and 32% weight percent to form different loading MMMs. SEM analysis of membranes revealed good compatibility/adhesion between the MOF and polymer. The permeability of He, H, O, CO, N, and CH were measured for the pure and composite membranes. The ideal selectivity of different gas pairs were calculated and compared with reported mixed matrix membranes. The maximum increases in permeabilities were observed in 32% loaded membrane; nevertheless, these performance/permeability increases were at the expense of a slight decrease of selectivity. In the optimally loaded membrane (, 24 wt% loaded membrane), the permeability of H, O, and CO increased by 80.2%, 78.0%, and 67.2%, respectively, as compared to the pure membrane. Moreover, the selectivity of H/CH, O/N, and H/CO gas pairs also increased by 16%, 15%, and 8% in the 24% loaded membrane, respectively.
金属有机框架材料（MOFs）被认为是用于气体分离的很有前景的多孔晶体材料。考虑到混合基质膜通常通过提高选择性、渗透率或两者（渗透选择性）来提升聚合物的气体分离性能，首次将沸石咪唑框架-95（ZIF-95）MOF分散在聚砜（PSF）聚合物中以形成混合基质膜（MMMs），即ZIF-95/PSF。对制备的ZIF-95/PSF膜进行了各种气体分离测试。使用粉末X射线衍射（PXRD）、扫描电子显微镜（SEM）、热重分析（TGA）、孔隙率测量等不同分析方法对溶剂热合成的ZIF-95进行了表征。将ZIF-95与PSF按8%、16%、24%和32%的重量百分比混合，以形成不同负载量的MMMs。膜的SEM分析表明MOF与聚合物之间具有良好的相容性/粘附性。测量了纯膜和复合膜对He、H、O、CO、N和CH的渗透率。计算了不同气体对的理想选择性，并与报道的混合基质膜进行了比较。在负载量为32%的膜中观察到渗透率的最大增加；然而，这些性能/渗透率的增加是以选择性略有下降为代价的。在最佳负载量的膜（负载量为24 wt%的膜）中，与纯膜相比，H、O和CO的渗透率分别提高了80.2%、78.0%和67.2%。此外，在负载量为24%的膜中，H/CH、O/N和H/CO气体对的选择性也分别提高了16%、15%和8%。
