Liquid-Assisted Mechanochemical Synthesis of Copper Based MOF-505 for the Separation of CO₂ over CH₄ or N₂

Abstract

Mechanochemical synthesis, driven the chemical transformation by mechanical force, has been a rapid and efficient strategy to prepare metal–organic frameworks (MOFs). In this work, a liquid-assisted mechanochemical method has been successfully applied to the synthesis of copper based MOF-505. The crystallinity and porosity of MOF-505 were investigated by adjusting the synthesis parameters, such as added solvent (type and amount) and grinding time. Results showed that the type and amount of added solvent were crucial parameters for the mechanochemical synthesis of MOF-505. Furthermore, the optimizations of MOF-505 synthesis were carried out: grinding Cu­(OAc)2·H2O and H4bptc as starting materials for 80 min with 0.4 mL of DMF assisted, giving MOF-505-K with Brunauer–Emmett–Teller (BET) surface area of 977 m2/g. Meanwhile, MOF-505-K had moderate CO2 adsorption capacity of 2.01 mmol/g at 298 K and 100 kPa. The adsorptive selectivity determined from ideal adsorbed solution theory (IAST) indicated that MOF-505-K had high CO2/N2 and CO2/CH4 selectivities (26.6 and 5.5) at 298 K. Highly efficient mechanochemical synthesis of MOF-505 provides the promise to facilitate the industrial application of CO2 capture.

A water-stable fcu-MOF material with exposed amino groups for the multi-functional separation of small molecules

“…[ [55][56][57][58][59] Such excellent performance reveals the bright promise of compound 1 for small molecule separation and purification. The aforementioned results were further confirmed by the isosteric heat of adsorption (Q st ) which was calculated via the experimental adsorption data, as illustrated in Fig.…”

Metal-Organic Framework Materials for Perovskite Solar Cells

“…MOF-5-B optimized by mechanochemical synthesis showed preferential adsorption for long chain alkanes at low pressure. MOF-505 was synthesized using the mechanochemical technique, and it was confirmed that the type and amount of the added solvent were decisive factors in producing MOF-505 [ 26 ].…”

Ultrafast Synthesis of Ni-MOF in One Minute by Ball Milling

“…This fast reaction speed is due to the sufficient energy provided by the mechanical force during ball milling. From a thermodynamic point of view, generally, the chemical potential of a substance in the solid state is higher than that of the same one in the liquid state [30,38,39,40]. Thus, the driving force of the formation of Ni-MOF is higher than that of solution-based synthesis method [30].…”

“…Importantly, it is even possible to be more rapid and efficient than solvent-based methods. Since the synthesis of the moderately porous copper(II) isonicotinate MOF in pioneering work reported by James’ group [21], milling procedures have been successfully applied for the synthesis of several popular MOF materials, such as zeolitic azolate frameworks [22,23], rare-earth(III) metal−organic frameworks [24], isoreticular metal-organic frameworks (IRMOFs) [25], iron(III) trimesate MIL-100 (MIL = Materials of Institut Lavoisier) [26], MOF-74 [27], Hong Kong University of Science and Technology (HKUST)-1 [28], Cu 2 I 2 (triphenylphosphine) 2 (L) n ( n = 1, 2) [29], copper-based MOF-505 [30], and UiO-66 (UiO = University of Oslo) and UiO-67 derivatives [31,32,33]. Previously, Pichon and James [21] described a survey of the potential reactions between Ni(OAc) 2 , Ni(NO 3 ) 2 , NiSO 4 , and H 3 BTC under mechanochemical solvent-free conditions and, unfortunately, only grinding nickel sulfate with H 3 BTC gave a partial reaction.…”