Enhanced Hydrostability in Ni-Doped MOF-5

Abstract

Ni-doped MOF-5s were successfully synthesized for the first time via solvothermal crystallization process to enhance the hydrostability. Several characterization techniques, including X-ray diffraction (XRD), thermogravimetrical analysis (TGA), scanning electron microscopy (SEM), energy-dispersive spectroscopy instrument (EDS), inductively coupled plasma (ICP), infrared spectroscopy (IR), atomic sorption, diffuse-reflectance UV-vis spectroscopy, and gas sorption measurement, strongly support the effective incorporation of Ni(II) ions into the framework. The results demonstrated that the Ni-doped MOF-5s not only exhibit larger Langmuir specific surface areas and larger pores than the undoped MOF-5, but also significantly enhance water resistance of the framework. The H(2) uptake capacity of undoped MOF-5 drops rapidly when exposed to the ambient air, whereas the H(2) adsorptions of the Ni-doped MOF-5s remain stable for 4 days.

Effect of modified linkers of MOF-5 on enhancing interaction energies: A theoretical study

“…However, so far there is no binding energy results available in literature to validate our calculations except for unmodified linker, benzene dicarboxalate mentioned above. Our investigation is in agreement with previous studies that showed modification of MOFs models increases the interaction energies between hydrogen molecule and MOFs[11,25,[37][38][39][40][41] . From the investigations it can be concluded that using density functional theory based on PW91/DN level (GGA functional) and M06-2X methods is reliable for accurate H 2 binding energies on the models of modified linkers.Table3.…”

“…Metal organic framework (MOF-5) has gained considerable attention compared to other MOFs, based on experimental and theoretical studies available in literature [11][12][13]. Within the huge MOF family of structures, the most well-known example is MOF-5 (IRMOF-1), which has higher apparent surface area and pore volume than most porous crystalline zeolites.The framework atoms in MOF-5 occupy only a small fraction of the available space in the crystal [14].…”

Removal of methylene blue from aqueous solutions by an adsorbent based on metal-organic framework and polyoxometalate

“…Compared to the pure Cu 3 (BTC) 2 , the last stage of H 6 P 2 W 18 O 62 @Cu 3 (BTC) 2 occurs in lower temperature. This may be explained that H 6 P 2 W 18 O 62 locates in the pure Cu 3 (BTC) 2 framework to form smaller cages in the composite [41], resulting in the richer structure and lower thermal stability of the host channel framework than that of pure Cu 3 (BTC) 2 . Fig.3a shows that the pure H 6 P 2 W 18 O 62 is a kind of micron-sized spherical structure crystals with different sizes and the unsmoothed surfaces, on which the obvious cracks and porous structure can be seen from its high resolution image as shown in Fig.3b.…”

Mixed cobalt/nickel metal–organic framework, an efficient catalyst for one-pot synthesis of substituted imidazoles

“…Heterometallic MOFs have been investigated for the modulation of framework properties, such as the enhancement of framework stability, gas sorption behavior, catalytic activity, and the tuning of breathing behavior, luminescence, and magnetic properties [24][25][26]. A general strategy toward heterometallic MOFs, especially bimetallic MOFs, is to use different metal ions as reactants during the conventional solvothermal reaction process.…”