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Metal–organic frameworks (MOFs) with adjustable structures, diverse chemical functionalities, and excellent CO 2 capture ability have shown important potential application in the photocatalytic reduction of CO 2 to valuable fuel to curb the energy crisis. In this work, a series of new isostructural lanthanide-organic frameworks based on hexanuclear Ln 6 O 8 clusters, (DMA) 2 Ln 6 (μ 3 –OH) 8 (H 2 O) 6 (SBTC) 3 n (Ln-MOFs, Ln = Eu, Dy, Gd, Tb, Yb; H 4 SBTC = 5, 5′- (ethene-1, 2-diyl) di-isophthalic acid; DMA = dimethylamine cation) were synthesized by the solvothermal method. Ln-MOFs were metal–organic frameworks formed by Ln 6 (μ 3 –OH) 8 clusters and poly (carboxylic acid) ligands H 4 SBTC, which exhibited excellent photocatalytic properties for the reduction of CO 2 to CO. Among these Ln-MOFs, the production rate of photocatalytic reduction of CO 2 to CO by Eu-MOF was 663. 00 μmol·h –1 ·g –1 and the selectivity reached 94. 2%, utilizing Ru (bpy) 3 Cl 2 ·6H 2 O as photosensitizers. Experimental characterizations and density functional theory (DFT) calculations unveiled that the effective charge separation, strong CO 2 binding affinity, weak H 2 O adsorption energy, as well as low reaction energy barriers for the *COOH intermediates over Eu-MOF play an important role in possessing superior photoactivity. This study provides insights into the field of Ln-MOF materials for efficient photocatalytic CO 2 reduction and conversion applications.
Xie et al. (Thu,) studied this question.