Construction and Photocatalytic Activities of a Series of Isostructural Co2+/Zn2+ Metal-Doped Metal–Organic Frameworks

Photocatalytic behaviors of isostructural metal-doped metal–organic frameworks were rarely discussed in the field of metal–organic frameworks. Herein, a series of 2D isomorphous Co2+/Zn2+ metal-doped metal–organic frameworks, namely, [M(tpbpc)(bdc)0.5·H2O]·solvent (M = Co (1), Co0.545Zn0.455 (2), Co0.2165Zn0.7835 (3), Co0.0258Zn0.9742 (4), Zn (5), Htpbpc = 4′-[4,2′;6′,4″] terpyridin-4′-yl-biphenyl-4-carboxylic acid, H2bdc = 1,4-benzenedicarboxylic acid), have been successfully synthesized under solvothermal conditions, and the crystal structures were testified by the single-crystal X-ray diffraction analysis and PXRD analysis. The photocatalysis activities of 1–5 were investigated by photodegradation of methyl orange (MO) experiments under visible light irradiation. Results indicated that 1 is nearly an inactive photocatalyst for degradation of MO, whereas 5 exhibits excellent photocatalytic activity under visible light irradiation. Interestingly, when Co2+ ions are gradually replaced by Zn2+ ions in the ...