Boosting C₂H₂/CO₂separation of metal–organic frameworksviaanion exchange and temperature elevation

Abstract

Developing new strategies to enhance adsorbents’ gas separation performance is highly desirable. In this contribution, we created a post-synthetic modification approach to enhance the C2H2/CO2 separation performance for an ultramicroporous...

Topological Design of Unprecedented Metal‐Organic Frameworks Featuring Multiple Anion Functionalities and Hierarchical Porosity for Benchmark Acetylene Separation

“…Interestingly, water guest molecules are identified in the small cages instead of coordination to the open Cu II sites (Figure S6), indicating this Cu II vacancy is relatively stable without any coordinating molecules due to the protection and steric hindrance of the surrounding pydrine groups. Every TPBDA can link four different Cu II , thus the ratio of Cu II : TPBDA = 1 : 1, which is different from all previously reported APMOFs with pcu [38][39][40] or ith-d topology. [53,54,64,65] It is noteworthy that the network is cationic due to the ratio of Cu II : AlF 6 3À = 2 : 1.…”

“…[16][17][18][19][20][21][22][23][24][25] The customtailored pore size/shape and pore chemistry have allowed the prospective design of target porous materials with desirable functions for gas separations. [26][27][28][29][30][31][32][33][34][35][36][37] In the context of C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 separation, the incorporation of anions (eg, NO 3 À , BF 4 À , Cl À , SiF 6 2À , etc) to form preferable hydrogen bonding with C 2 H 2 [38][39][40][41][42][43][44][45] is a typical strategy to achieve good C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 separation performance. To date, the benchmark MOFs for C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 separation are anion pillared MOFs (APMOFs) featuring one dimensional (1D) pore channels and uniform pore sizes, such as SIFSIX-1-Cu [41] and SIFSIX-14-Cu-i.…”

Vertex Strategy in Layered 2D MOFs: Simultaneous Improvement of Thermodynamics and Kinetics for Record C2H2/CO2 Separation Performance

“…As emerging porous solid materials, metal–organic frameworks (MOFs) have obvious advantages over zeolite, activated carbon, silica gel, and other traditional adsorbents, owing to their high porosity, adjustable pore sizes/shapes, and easily functionalized internal pore surface. − It is expected to achieve efficient separation between mixtures with slight differences such as C 2 H 2 /CO 2 . Researchers have reported various MOFs for C 2 H 2 /CO 2 separation recently, − where major efforts have been made to adjust the 3D framework to generate appropriate pore space, for instance, introducing open metal sites, ,, introducing polar functional groups, − constructing hydrogen bonding nanotraps, pore space partition strategies, , constructing interpenetration structures, ligand derivatization, ,,, partial linker substitution strategy, induced-fit transformation strategy, etc. Significant progress has been made by these contributions, but the design of C 2 H 2 selective adsorbents that combines high adsorption capacity with high selectivity remains a challenge. ,,,, Layered 2D MOFs are a class of MOFs with 2D infinite extension networks, which have no rigid chemical bonds between layers compared with traditional porous materials and 3D MOFs.…”

Recognition, detection and host–guest chemistry of hydrogen peroxide in a fluorescent metal–organic framework with chiral helical channels

“…Metal–organic frameworks (MOFs) have been emerging as one of the most promising materials due to their tunable pore sizes, diverse structures, and exposed metal sites, 9–12 which capture molecules by means of solid–liquid phases without changing their activity and functional groups, providing advantageous conditions for studying their interactions at the atomic level in host–guest chemistry. The utilization of biomolecular linkers 13–17 can enhance the recognition capability of MOFs, and the diversity in the size and shape of channels within MOFs endows them with unique properties.…”

“…The time from the addition of H 2 O 2 to the actual experiment usually spans hours, resulting in a constantly changing "background" signal, and it is difficult to guarantee and demonstrate uniform probe distribution in samples, which is also one of the reasons why the identification and quantitative detection of H 2 O 2 in cells remains challenging. [6][7][8] Metal-organic frameworks (MOFs) have been emerging as one of the most promising materials due to their tunable pore sizes, diverse structures, and exposed metal sites, [9][10][11][12] which capture molecules by means of solid-liquid phases without changing their activity and functional groups, providing advantageous conditions for studying their interactions at the atomic level in host-guest chemistry. The utilization of biomolecular linkers [13][14][15][16][17] can enhance the recognition capability of MOFs, and the diversity in the size and shape of channels within MOFs endows them with unique properties.…”