Zhao Yayun, Zhou Chen, Kong Chunlong, Chen Liang
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, P. R. China.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
JACS Au. 2021 Feb 11;1(3):328-335. doi: 10.1021/jacsau.0c00073. eCollection 2021 Mar 22.
Here, reduced graphene oxide (r-GO) nanosheets were embedded in an organosilica network to assemble an ultrathin hybrid membrane on the tubular ceramic substrate. With the organosilica nanocompartments inside the r-GO stacks and the intensified polymerization, r-GO sheets endow the as-prepared hybrid membranes with high H and CO separation performance. The resulting selectivities of H/CH and CO/CH are found to be 223 and 55, respectively, together with gas permeance of approximately 2.5 × 10 mol·m·s·Pa for H and 6.1 × 10 mol·m·s·Pa for CO at room temperature and 0.2 MPa. To separate larger molecules from H, the H/CH and H/-CH selectivities are as high as 1775 and 2548, respectively. Moreover, at 150 °C and 0.2 MPa, the hybrid membrane retains high separation performances with ideal selectivities higher than 200 and 30 for H/CH and CO/CH, respectively, which are attractive for gas separation and purification of practical applications.
在此，将还原氧化石墨烯（r-GO）纳米片嵌入有机硅网络中，以在管状陶瓷基材上组装超薄混合膜。由于r-GO堆叠内部存在有机硅纳米隔室且聚合作用增强，r-GO片赋予了所制备的混合膜高的H₂和CO分离性能。在室温及0.2 MPa条件下，所得H₂/CH₄和CO/CH₄的选择性分别为223和55，同时H₂的气体渗透率约为2.5×10⁻⁷ mol·m⁻²·s⁻¹·Pa，CO的气体渗透率约为6.1×10⁻⁸ mol·m⁻²·s⁻¹·Pa。为了从H₂中分离出更大的分子，H₂/C₂H₄和H₂/C₃H₆的选择性分别高达1775和2548。此外，在150℃和0.2 MPa条件下，该混合膜仍保持高分离性能，H₂/CH₄和CO/CH₄的理想选择性分别高于200和30，这对于实际应用中的气体分离和纯化具有吸引力。
