SCHEDULED MAINTENANCE
A stable metal cluster-metalloporphyrin MOF with high capacity for cationic dye removal†
*b
Mei
Pan
*a
and
Abstract
A metalloporphyrin Cu5-cluster based MOF (metal–organic framework), [Cu4.5((H4TZPP)(TZPP)Cl2)(H2O)0.5]·CH3NH2CH3·7EtOH·8H2O (LIFM-WZ-3) was synthesized from the tetrapodal ligand 5,10,15,20-tetrakis[4-(2,3,4,5-tetrazolyl)phenyl]porphyrin (H6TZPP) and copper chloride. LIFM-WZ-3 exhibits a rare 2D + 3D → 3D interpenetration topology, of which the frl-type 3D MOF and a layered 2D HOF (hydrogen bond organic framework) are intertwined, leading to an anionic framework with 1D spindle-like channels. Powder X-ray diffraction analysis reveals that the framework is stable in acid, base and various organic solvent environments. LIFM-WZ-3 exhibits moderately high separation performances for CO2/CH4, CO2/N2, C3H6/CH4, C2H6/CH4, and C2H4/CH4 at room temperature. Specifically, the anionic framework in LIFM-WZ-3 containing dimethylamine cations can selectively adsorb cationic organic dyes from aqueous pollutants for recycle purpose. The high adsorption capacity for methylene-blue (MB+, 983 mg g−1) and crystal violet (CV+, 713.5 mg g−1) ranks the highest among those MOFs ever reported.
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