Abstract
In this study, a novel melamine derivative (TABC)-doped metal-organic framework (MOF) composite UiO-66-TABC was synthesised, with an attempt to remove Co(II) from aqueous solution. All analysis results characterised by SEM, XRD, FT-IR, EDS, and N2 adsorption–desorption experiments confirmed that TABC was successfully encapsulated into UiO-66. Compared to initial MOFs, the doped composite exhibited a remarkable decrease in both the surface area and pore volume due to the incorporation of TABC nanoparticles into the cages of the UiO-66. The adsorption experiments showed that the adsorption performance of UiO-66-TABC to Co(II) was significantly superior to that of UiO-66, with a maximum adsorption capacity of 137.0 mg/g at 298 K. The adsorption process was spontaneous and endothermic, and can be well described by the Langmuir and pseudo-second-order kinetic models. The regeneration experiments also demonstrated that UiO-66-TABC was highly stable and could be recycled with relatively stable adsorption ability. This study provides a facile method for preparing functional MOFs by doping approach to improve their adsorption capacity, which will improve the applicability of MOFs without grafted atoms or groups.
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