Novel Hierarchical Fe(III)-Doped Cu-MOFs With Enhanced Adsorption of Benzene Vapor

Abstract

New hierarchical Fe(III)-doped Cu-MOFs (Fe-HK) were developed via introduction of Fe3+ ions during HKUST-1 synthesis. The obtained products were characterized by N2 adsorption, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, FTIR spectroscopy, and thermal analysis. The adsorption isotherms and kinetics of benzene vapor were measured and consecutive adsorption–desorption cycles were performed. It was found that the hierarchical-pore Fe-HK-2 exhibited optimal textural properties with high BET surface area of 1,707 m2/g and total pore volume of 0.93 cm3/g, which were higher than those of the unmodified HKUST-1. Significantly, the hierarchical-pore Fe-HK-2 possessed outstanding benzene adsorption capacity, which was 1.5 times greater than the value on HKUST-1. Benzene diffusivity of Fe-HK-2 was 1.7 times faster than that of parent HKUST-1. Furthermore, the benzene adsorption on Fe-HK-2 was highly reversible. The hierarchical-pore Fe-HK-2 with high porosity, outstanding adsorption capacity, enhanced diffusion rate, and excellent reversibility might be an attractive candidate for VOCs adsorption. This may offer a simple and effective strategy to synthesize hierarchical-pore MOFs by doping with other metal ions.

Batch-screening guided continuous flow synthesis of the metal-organic framework HKUST-1 in a millifluidic droplet reactor

“…We performed PXRD to confirm the crystallinity of the synthesized HKUST-1 samples. The PXRD patterns for samples obtained from the batch and continuous processes are Similarly, the symmetric COO − vibrations are captured by the peaks labeled 'c' and 'd', corresponding to the wavenumbers of 1370 cm −1 and 1445 cm −1 respectively [54][55][56]. The vibration of the Cu-O bond is labeled as peak 'e' at the wavenumber of 730 cm −1 [56].…”

“…The PXRD patterns for samples obtained from the batch and continuous processes are Similarly, the symmetric COO − vibrations are captured by the peaks labeled 'c' and 'd', corresponding to the wavenumbers of 1370 cm −1 and 1445 cm −1 respectively [54][55][56]. The vibration of the Cu-O bond is labeled as peak 'e' at the wavenumber of 730 cm −1 [56]. Therefore, the presence of the labeled peaks in the spectra substantiated the coordination of the carboxylate binding groups to the copper ions to form the secondary building units of HKUST-1.…”

New hybrid MOF/polymer composites for the photodegradation of organic dyes

“…Table 4 shows the wavenumber of the most important HKUSTI-1(Cu) functional groups. The peak at 729 cm -1 is attributed to the Cu-O bond 51,52 . The C=C stretching vibration of benzene is characterized by a strong band at 1370 cm -1 51,53 .…”

Zirconium-Based Metal Organic Frameworks for the Capture of Carbon Dioxide and Ethanol Vapour. A Comparative Study

“…They have several key characteristics such as large specific surface areas, a wide variety of structures, and large pore volumes [16]. Many studies have pointed out that some MOFs also exhibit excellent VOCs and CO 2 adsorption capacities [1,2,[17][18][19][20][21][22][23]. Furthermore, unlike MOF-5 or HKUST-1 [24,25], some MOFs present high stability in water, which is a prerequisite for VOCs or CO 2 capture in ambient conditions [22,26].…”