A Novel Mesoporous Aluminum‐Based MOF with Large Pore Volume for High Concentration Benzene Adsorption

Abstract Developing large pore volume mesoporous metal‐organic frameworks (MOFs) is a reliable strategy for adsorbing high‐concentration benzene in the event of accidental leakage. Herein, a novel mesoporous Al‐based MOF, named ZJU‐928(Al), is synthesized using biphenyl‐3,4′,5‐tricarboxylic acid ligands and low toxic AlO₆ cluster. It has larger pore volume (1.05 cm³ g⁻¹), order hexagonal channel (32.10 Å), and higher specific surface area (2344 m² g⁻¹). As relative pressure up to 0.10, benzene adsorption of ZJU‐928(Al) rises to 9.99 mmol g⁻¹, exhibiting an excellent saturation benzene adsorption of 11.37 mmol g⁻¹ at 298 K. The isosteric heat of adsorption for benzene on ZJU‐928(Al) is only 24.52 kJ mol⁻¹ at near‐zero loading, lower than that of most reported MOFs, allowing for lower energy consumption during ZJU‐928(Al) regeneration. ZJU‐928(Al) has excellent cyclical benzene adsorption‐desorption performance, and highest benzene diffusivity coefficient (2.65 × 10⁻⁵ cm² s⁻¹). Simulation shows that the excellent saturation benzene adsorption performance of ZJU‐928(Al) can be attributed to the larger pore volume accommodating more benzene molecules. Consequently, this research synthesizes a novel mesoporous Al‐based MOF with excellent saturation benzene adsorption, highlighting the potential of MOFs for high‐concentration toxic gas adsorption.