Effects of Alkali Metal (Li, Na, and K) Incorporation in NH2–MIL125(Ti) on the Performance of CO2 Adsorption

Abstract

A series of titanium-based, metal–organic framework (MOF) materials, xM@NH2-MIL125(Ti) (x is the alkali metal loading percentage during the synthesis; M = Li, Na, K), have been synthesized solvothermally. Alkali metal doping in the NH2–MIL125(Ti) in situ solvothermal process demonstrated a vital modification of the material structure and surface morphology for the CO2 adsorption capacity at ambient conditions. By changing the reactants’ precursor, including different kinds of alkali metal, the morphology of xM@NH2–MIL125(Ti) can be adjusted from a tetragonal plate through a circular plate to a truncated octahedron. The variation of the alkali metal loading results in substantial differences in the CO2 adsorption. The properties of xM@NH2–MIL125(Ti) were evaluated via functional group coordination using FT-IR, phase identification based on X-ray diffraction (XRD), surface morphology through scanning electron microscopy (SEM), as well as N2 and CO2 adsorption by physical gas adsorption analysis. This work reveals a new pathway to the modification of MOF materials for high-efficiency CO2 adsorption.

Removal of CO2 from Flue Gas Using Seaweed Porous Carbons Prepared by Urea Doping and KOH Activation

“…Among these methods, adsorption is regarded to have good application prospects because it has the advantages of low corrosion, simple operation, and strong regeneration. Currently, common CO 2 adsorbents mainly include activated carbons (AC), 9 zeolites, 10 silicas, 11 metal−organic frameworks (MOFs), 12 metal oxides, 13 alkali metal-based materials, 14 biomass-based carbons, 15 activated carbon fibers (ACFs), 16 graphene, 17 carbon nanotubes, 18 ordered porous carbons, 19 etc. In these adsorbents, biomass-based carbons have attracted increasing attention due to its advantages of low cost and wide source.…”

CuBTC Metal–Organic Framework Decorated with FeBTC Nanoparticles with Enhance Water Stability for Environmental Remediation Applications

“…A similar phenomenon was also observed in MIL-101 (Cr, Mg), Ni-doped MOF-5, alkali metal cation doped MOF-5, and Fe-doped CuBTC, supporting the BET results of FeCuBTC. 29 − 33 Type IV N 2 adsorption isotherms were recorded, implying that the samples had mesoporous structures. The average pore diameter of FeCuBTC was 2.1 nm, which is comparable to those of CuBTC (1.9 nm) and FeBTC (2.0 nm).…”

Synthesis of magnetic metal organic framework/covalent organic framework hybrid materials as adsorbents for magnetic solid‐phase extraction of four endocrine‐disrupting chemicals from milk samples

“…Moreover, Fe 3 O 4 @A‐TpBD exhibited a peak at 1724 cm −1 , assigned to the stretching vibration of the C=O bonds from ‐COOH, 19 which indicated the successful graft of 4‐aminobenzoic acid in Fe 3 O 4 @TpBD. For Fe 3 O 4 @A‐TpBD@NH 2 ‐MIL‐125(Ti), the characteristic peak at 484 cm −1 was assigned to the O‐Ti‐O stretching vibration 32,33 (Figure 3A). The results demonstrated NH 2 ‐MIL‐125(Ti) was fixed onto Fe 3 O 4 @A‐TpBD and that the synthesis of the MOF/COF hybrid materials was achieved.…”