Adjustable structure transition and improved gases (H2, CO2) adsorption property of metal–organic framework MIL-53 by encapsulation of BNHx

Recent advances in solid sorbents for CO2capture and new development trends

“…Believing that impregnation of poly-alkylamines onto MOFs might afford more active amine groups than diamines and maintain the strong interaction between CO 2 and alkylamine groups, Lin et al 189 studied the PEI incorporated MOF for CO 2 capture. At 100 wt% PEI loading, the CO 2 adsorption capacity at 0.15 bar reached a very competitive value of 4.2 mmol g À1 at 25 C, and 3.4 mmol g À1 at 50 C, with a high CO 2 /N 2 selectivity up to 770 at 25 C, and 1200 at 50 C. 189 Si et al 192 reported that the structure transition of a exible MOF (MIL-53) could be adjusted by connement of BNH x into MIL-53 channels, which yielded a CO 2 adsorption capacity of 4.5 mmol g À1 at 0 C and 1 bar. Recently, Hu et al 193 synthesized a series of alkylamine tethered MIL-101.…”

Multifunctional polyoxometalates encapsulated in MIL-100(Fe): highly efficient photocatalysts for selective transformation under visible light

“…Metal-organic frameworks (MOFs) obtained by the assembly of metallic ions and organic ligands have attracted tremendous attention in the last two decades due to their high surface area, modular assembly, exceptional porosity and large specific surface area. [12][13][14] Since the historic work carried out by Ferey et al on the direct encapsulation of POMs in MIL-101(Cr), a range of POM@MOF nanocomposites have † Electronic supplementary information (ESI) available: XRD patterns of calculated MIL-100(Fe); BET adsorption-desorption isotherm and Horvath-Kawazoe pore distribution of MIL-100(Fe) and HPMo@MIL-100(Fe); TEM image and EDX image of 30%HPMo@MIL-100(Fe); Mo/Fe ratio in the HPMo@MIL-100(Fe) nanocomposites determined by the ICP analysis; reusability of 30%HPMo@MIL-100 (Fe) for the photocatalytic selective oxidation of benzyl alcohol; XRD patterns of 30%HPMo@MIL-100(Fe) before and after the catalytic reaction; the concentration of Fe(III) and Mo(VI) during the reaction; typical Mott-Schottky plots of MIL-100(Fe); UV-vis spectra of H 3 PMo 12 O 40 ; zeta potential of MIL-100(Fe) as a function of pH values; photocatalytic reduction of aqueous Cr(VI) over (1) MIL-100(Fe), (2) H 3 PMo 12 O 40 , (3) 5%HPMo-MIL-100(Fe), and (4) 5% HPMo@MIL-100(Fe) under the irradiation of visible light (λ ≥ 420 nm) for 8 min; the concentration of Fe(III) and Mo(VI) during the reaction; the photocatalytic reduction of Cr(VI) over 5%HPMo@MIL-100(Fe) under visible light irradiation for 8 min in the presence of AgNO 3 ; transient photocurrent response of MIL-100(Fe) and 5%HPMo@MIL-100(Fe) in 0.2 M Na 2 SO 4 aqueous solution ( pH 6.8); photoluminescence (PL) spectra of MIL-100(Fe) and 5% HPMo@MIL-100(Fe); Nyquist impedance plots of MIL-100(Fe) and 5% HPMo@MIL-100(Fe). See DOI: 10 been discussed by researchers with great enthusiasm.…”

“…[15][16][17] The superiority of using MOFs as the support for POMs lies in the following facts: (i) suitable cavities with appropriate sizes allow the dispersion of POMs at the molecular level and (ii) mild and simple synthesis conditions permit the one-step encapsulation of the guest POMs. 12,13 For all these reasons, MOFs could be brilliant porous matrices to incorporate POMs. More importantly, it has been reported that some photoactive MOFs such as MOF-5, UiO-66(NH 2 ) and MIL-53(Fe) behave as semiconductors.…”

Encapsulation of gases in powder solid matrices and their applications: A review

“…This can be done by introducing metal ions or desired functional groups into the metal-organic frameworks (in their cavity, organic linker groups or open metal sites). Some examples are replacement of the coordinated molecules by highly polar ligands to enhance adsorption selective capacity for carbon dioxide over nitrogen [188]; coordination of polyethyleneimine into metal-organic frameworks (MIL-101) to accelerate CO 2 adsorption capacity [189]; imprisonment of boron nitride into MIL-53 channels to improve adsorption capacity of H 2 and CO 2 [190]; or changes of N 2 , H 2 or CO 2 adsorption capacity of MIL-53 with the introduction of isocyanate and isothiocyanate groups into their structure [191]; or improvement of adsorption selectivity towards to CO 2 over CH 4 of MOF-5 by adding lithium metal (Li) [192]. There are a large number of ways to create numerous types of metal-organic frameworks.…”