TY - JOUR
T1 - In-situ cross-linking and shear-driven coating enable defect-free tubular ZIF-8 membranes toward efficient C3H6/C3H8 separation
AU - Wu, Luogang
AU - Hua, Jingxian
AU - Gu, Yawei
AU - Sun, Jian
AU - Wang, Qian
AU - Zhang, Lixiong
AU - Lian, Haiqian
AU - Pan, Yichang
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/5
Y1 - 2025/5
N2 - Eliminating potential defects is crucial for making tubular ZIF-8 (T-ZIF-8) membranes widely adopted in chemical process industries. However, the geometric restriction of the inner T-ZIF-8 membrane and the high viscosity of cross-linked PDMS solution pose challenges in uniform polymer deposition and interfacial adhesion that traditional dip-coating methods may not effectively address. Herein, we propose an in-situ cross-linking and rolling coating (ISCL&RC) strategy to overcome these challenges. During the rolling coating process, the PDMS solution gradually solidifies on the surface of the T-ZIF-8 membrane under the shear force induced by gravity, forming a PDMS coating with uniform thickness. The in-situ cross-linking allows the low-viscosity PDMS solution to adequately infiltrate the surface of the T-ZIF-8 membrane, forming a desirable interface. Compared with the pristine T-ZIF-8 membrane, the T-ZIF-8/PDMS membrane demonstrates remarkable improvement in C3H6/C3H8 separation selectivity (2.6–18.5 times higher than the unmodified membrane), while the C3H6 permeance remains nearly unchanged. Notably, the T-ZIF-8/PDMS membrane sustains coating integrity under high pressure and industrial raw gas for 780 h without exhibiting bubbling or delamination. This work establishes a paradigm for defect engineering in confined tubular membrane systems, effectively bridging the gap between laboratory-scale synthesis and industrial module fabrication.
AB - Eliminating potential defects is crucial for making tubular ZIF-8 (T-ZIF-8) membranes widely adopted in chemical process industries. However, the geometric restriction of the inner T-ZIF-8 membrane and the high viscosity of cross-linked PDMS solution pose challenges in uniform polymer deposition and interfacial adhesion that traditional dip-coating methods may not effectively address. Herein, we propose an in-situ cross-linking and rolling coating (ISCL&RC) strategy to overcome these challenges. During the rolling coating process, the PDMS solution gradually solidifies on the surface of the T-ZIF-8 membrane under the shear force induced by gravity, forming a PDMS coating with uniform thickness. The in-situ cross-linking allows the low-viscosity PDMS solution to adequately infiltrate the surface of the T-ZIF-8 membrane, forming a desirable interface. Compared with the pristine T-ZIF-8 membrane, the T-ZIF-8/PDMS membrane demonstrates remarkable improvement in C3H6/C3H8 separation selectivity (2.6–18.5 times higher than the unmodified membrane), while the C3H6 permeance remains nearly unchanged. Notably, the T-ZIF-8/PDMS membrane sustains coating integrity under high pressure and industrial raw gas for 780 h without exhibiting bubbling or delamination. This work establishes a paradigm for defect engineering in confined tubular membrane systems, effectively bridging the gap between laboratory-scale synthesis and industrial module fabrication.
KW - CH/CH separation
KW - Defect
KW - In situ cross-linking
KW - PDMS coating
KW - Tubular ZIF-8 membrane
UR - http://www.scopus.com/inward/record.url?scp=105000777202&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2025.124010
DO - 10.1016/j.memsci.2025.124010
M3 - 文章
AN - SCOPUS:105000777202
SN - 0376-7388
VL - 725
JO - Journal of Membrane Science
JF - Journal of Membrane Science
M1 - 124010
ER -