952140-12-4Relevant articles and documents
Small-angle X-ray scattering documents the growth of metal-organic frameworks
Goesten, Maarten G.,Stavitski, Eli,Juan-Alca?iz, Jana,Marti?ez-Joaristi, Alberto,Petukhov, Andrei V.,Kapteijn, Freek,Gascon, Jorge
, p. 120 - 127 (2013)
We present a combined in situ small- and wide-angle scattering (SAXS/WAXS) study on the crystallization of two topical metal-organic frameworks synthesized from similar metal and organic precursors: NH2-MIL-53(Al) and NH2-MIL-101(Al). A thorough analysis of SAXS data reveals the most important phenomena occurring during crystallization and unravels the effect of the solvent. NH2-MIL-53(Al) growth follows two routes: (i) through direct hydrolysis of AlCl3·6H2O in water, and (ii) via the intermediate NH2-MOF-235(Al), which forms in pure DMF or DMF/H2O mixtures. In the case of pure H2O as solvent, formation of NH2-MIL-53(Al) crystals proceeds through steady growth in all three dimensions. The addition of DMF to the synthesis mixture results in amorphous scattering entities forming very rapidly and subsequently arranging into the intermediate phase, NH2-MOF-235(Al). In DMF/H2O mixtures, amorphous precursors develop in rapid fashion with fractal character dominating, followed by densification, crystallization of NH2-MOF- 235(Al) and slow transformation into NH2-MIL-53(Al). Formation of NH2-MIL-101(Al) only occurs when pure DMF is used as solvent, and it always proceeds through the formation of the intermediate NH2-MOF- 235(Al). In this case a smooth scatterer surface is observed, with morphology and size constant in time.
Amino-functionalized Al-MIL-53 for dimethoate pesticide removal from wastewater and their intermolecular interactions
Abdelhameed, Reda M.,Taha, Mohamed,Abdel-Gawad, Hassan,Hegazi, Bahira
, (2020/12/09)
Aluminum-organic framework was reformed with various amount of amino-group (Al-(BDC)x(BDC-NH2)1-x, x = 0.00, 0.25, 0.50, 0.75 and 1.00). The technique used to modify the aluminum-based metal-organic framework was the mixed bonding method. All prepared metal-organic frameworks exhibited the same structure as that of Al-MIL-53. The surface areas of amino-functionalized aluminum-based metal-organic framework showed (SBET = 866, 1105, 1260, 1100 and 1060 m2g?1) for Al-BDC, [Al-(BDC) 0.75(BDC-NH2)0.25], [Al-(BDC) 0.5(BDC-NH2)0.5], [Al-(BDC) 0.25(BDC-NH2)0.75] and Al-BDC-NH2, respectively. Amino groups have a great effect on organophosphorus insecticide dimethoate adsorption capability. Pesticide adsorption capacities of Al-BDC, [Al-(BDC) 0.75(BDC-NH2)0.25], [Al-(BDC) 0.5(BDC-NH2)0.5], [Al-(BDC) 0.25(BDC-NH2)0.75] and Al-BDC-NH2 were 154.8, 267.2, 513.4, 344.7 and 266.9 mg g?1, respectively. Fortunately, the results show that Al-(BDC) 0.5(BDC-NH2)0.5 is the best absorbent Al-MOF ratio to reduce dimethoate residue in wastewater. Monte Carlo simulation was used for evaluation of the dimethoate adsorption mechanism.
Solvent-Induced Control over Breathing Behavior in Flexible Metal–Organic Frameworks for Natural-Gas Delivery
Kundu, Tanay,Wahiduzzaman, Mohammad,Shah, Bhuvan B.,Maurin, Guillaume,Zhao, Dan
supporting information, p. 8073 - 8077 (2019/04/17)
Finding appropriate stimuli for controlling the breathing behavior of flexible metal–organic frameworks (MOFs) is highly challenging. Herein, we report the solvent-induced changes in the particle size and stability of different breathing phases of the MIL-53 series, a group of flexible MOFs. A water/dimethylformamide (DMF) ratio is tuned to synthesize members of the MIL-53 series which have different behaviors. The breathing is explored by high-pressure methane sorption tests. Increasing DMF concentration decreases MOF particle size and increases the stability of the porous phases, boosting the 5.8–65 bar sorption difference of methane, which is required for natural-gas delivery.
Palladium nanoparticles embedded in MOF matrices: Catalytic activity and structural stability in iodobenzene methoxycarbonylation
Isaeva, Vera I.,Eliseev, Oleg L.,Chernyshev, Vladimir V.,Bondarenko, Tatyana N.,Vergun, Vadim V.,Kapustin, Gennady I.,Lapidus, Albert L.,Kustov, Leonid M.
, p. 55 - 64 (2018/11/23)
This paper reports for the first time iodobenzene methoxycarbonylation over Pd-containing catalysts based on MOF materials differed in topology, texture properties and organic and inorganic building blocks: MIL-53(Al) (AlOHbdc, bdc = benzene-1,4-dicarboxylate), NH2-MIL-53(Al) (AlOHabdc, abdc = 2-aminobenzene-1,4-dicarboxylate), NH2-MIL-101(Al) (Al3Oabdc)3, and ZIF-8 (Zn(MeIm)2, MeIm = 2-methylimidazolate). Low-loaded nanocatalysts (0.1–0.5 wt.% Pd) based on MIL-53(Al) and ZIF-8 demonstrated a superior activity as compared to those on conventional supports such as silica and alumina. The catalytic performance of the synthesized nanocatalysts is affected both by the MOF support nature and Pd loading. Another important factor governing the performance of the Pd/MOF catalysts is the preparation procedure of the metal–organic matrices which affects their crystal size and morphology. This effect was studied for ZIF-8 materials.
