Widiastuti Nurul, Caralin Irmariza Shafitri, Widyanto Alvin Rahmad, Wijiyanti Rika, Gunawan Triyanda, Karim Zulhairun Abdul, Nomura Mikihiro, Yoshida Yuki
Department of Chemistry, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Sukolilo, Surabaya 60111, Indonesia.
Department of Applied Chemistry, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan.
R Soc Open Sci. 2022 Jun 22;9(6):211371. doi: 10.1098/rsos.211371. eCollection 2022 Jun.
Recently, natural gas (mostly methane) is frequently used as fuel, while hydrogen is a promising renewable energy source. However, each gas produced contains impurity gases. As a result, membrane separation is required. The mixed matrix membrane (MMM) is a promising membrane. The huge surface area and well-defined pore structure of zeolite templated carbon (ZTC)-based MMM allow for effective separation. However, the interfacial vacuum in MMM is difficult to avoid, contributing to poor separation performance. This research tries to improve separation performance by altering membrane surfaces. MMM PSF/ZTC was modified by annealing at 120, 150, and 190°C; coating using 0.01, 0.03, and 0.05 mol tetramethyl orthosilicate (TMOS); and a combination of both, i.e. annealing at 190°C and coating using 0.03 mol TMOS. MMM PSF/ZTC successfully significantly improved CO/CH selectivity by a combination of annealing at 190°C and coating 0.03 mol TMOS from 1.37 to 5.90 (331%), and H/CH selectivity by coating with 0.03 mol TMOS from 4.58 to 65.76 (1378%). The enhancement of selectivity was due to structural changes to the membrane that became denser and smoother, which SEM and AFM observed. In this study, annealing and coating treatments are the methods investigated for improving the polymer matrix and filler particle adhesion.
最近，天然气（主要是甲烷）常被用作燃料，而氢气是一种很有前景的可再生能源。然而，每种产生的气体都含有杂质气体。因此，需要进行膜分离。混合基质膜（MMM）是一种很有前景的膜。基于沸石模板碳（ZTC）的MMM具有巨大的表面积和明确的孔结构，能够实现有效分离。然而，MMM中的界面真空难以避免，这导致分离性能较差。本研究试图通过改变膜表面来提高分离性能。MMM PSF/ZTC通过在120、150和190°C下退火；使用0.01、0.03和0.05摩尔原硅酸四甲酯（TMOS）进行涂层；以及两者结合，即在190°C下退火并使用0.03摩尔TMOS进行涂层来进行改性。MMM PSF/ZTC通过在190°C下退火并使用0.03摩尔TMOS涂层成功地将CO/CH选择性从1.37显著提高到5.90（提高了331%），通过使用0.03摩尔TMOS涂层将H/CH选择性从4.58提高到65.76（提高了1378%）。选择性的提高是由于膜结构变得更致密、更光滑，这是通过扫描电子显微镜（SEM）和原子力显微镜（AFM）观察到的。在本研究中，退火和涂层处理是为改善聚合物基体与填料颗粒的粘附力而研究的方法。
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