The metal-organic frameworks (MOFs) UiO-66-NH2, UiO-66-2,5-(OH)2, UiO-66-NO2, UiO-66-NDC, and UiO-66-BPDC were synthesized under solvothermal conditions using different functionalized organic linkers. The structures and properties of the samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and nitrogen adsorption-desorption isotherms. The crystal structures of these functionalized UiO-66(Zr) forms were similar. A series of functionalized UiO-66(Zr) samples were used in the adsorption of carbon dioxide (CO2). UiO-66-NH2 had the highest CO2 adsorption capacity (about 3.35 mmol g-1) due to its small polar -NH2 group. The performance of UiO-66-NH2 in CO2 adsorption at different temperatures was also determined. The amino-functionalized material possessed better adsorption properties at 273 K than at 303 K, while the CO2 working capacity of UiO-66-NH2 was fully recovered after cyclic regeneration. metalorganic metal MOFs (MOFs UiO66NH2, UiO66NH2 UiONH UiO 66 NH2, NH2 NH UiO662,5OH2, UiO6625OH2 UiOOH 2,5 OH 2, 2 5 UiO-66-2,5-(OH)2 UiO66NO2, UiO66NO2 UiONO NO2, NO2 NO UiO-66-NO2 UiO66NDC, UiO66NDC UiONDC NDC, NDC UiO-66-NDC UiO66BPDC UiOBPDC BPDC linkers Xray X ray diffraction spectroscopy analysis microscopy adsorptiondesorption desorption isotherms UiO66Zr UiOZr Zr UiO-66(Zr similar CO2. CO . (CO2) UiO-66-NH about 335 3 35 3.3 g1 g 1 g-1 -NH group determined aminofunctionalized amino 27 30 regeneration UiO66NH 6 UiO662 5OH2 UiO662,5OH2 UiO6625OH 25 UiO-66-2,5-(OH) UiO66NO UiO-66-NO (CO2 33 3. g- UiO66 5OH UiO662,5OH UiO-66-2,5-(OH (CO UiO6

Metal-organic frameworks (MOFs) are promising nanomaterials with unprecedented capacity to store small molecules. Titanium cooperated with NH2-UiO-66 were prepared via post synthesis modifications approach and their structures and properties were characterized by X-raydiffraction,Fourier transform infrared spectroscopy, thermogravimetric analysis, nitrogen adsorption isotherms, and scanning electron microscopy. The resultant titanium cooperated with NH2-UiO-66 showed excellent performance for CO2 adsorption via the formation of oxo-bridged hetero-Zr-Ti clusters. This result clearly demonstrates that the smaller Ti ions exchanged with the Zr ions of NH2-UiO-66 may decrease the pore sizes within the framework to be closer to the ideal pore sizes for CO2 adsorption.