Ionic Liquid Functionalized Metal–Organic Framework ([DEIm][PF₆]@MOF-5): Synthesis, Characterization, and Catalytic Application in the Reduction of 4-Nitrophenol

Abstract

A novel, unique, highly effective, and recyclable heterogeneous catalyst, diethyl imidazolium hexafluorophosphate ionic liquid supported metal− organic framework ([DEIm][PF 6 ]@MOF-5), has been synthesized using a simple impregnation method at ambient temperature. Characterization of the catalyst was done through various techniques such as Fourier transform infrared (FTIR), energy dispersive X-ray, X-ray diffraction (XRD), transmission electron microscopy, scanning electron microscopy (SEM), elemental mapping, Raman spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis (TGA) analyses. The kinetic study has shown the high catalytic performance of [DEIm][PF 6 ]@MOF-5 for the reduction of 4-nitrophenol (NP) compared to other catalysts. The catalyst also exhibited efficient electrochemical activity toward 4-NP reduction. The catalyst was recyclable for more than seven cycles without any significant loss in its catalytic performance. The recycled catalyst was further studied using XRD, FTIR, SEM, and TGA analyses to investigate the structural changes that occurred during the reaction. The catalyst maintained its structural integrity even after seven cycles.

Two-Dimensional Lanthanide Metal–Organic Frameworks as a Platform for Sensing Pollutant and Nitrophenols Reduction

“…With the rapid global economic development and explosive population growth, pesticides, drugs, dyes, and other organic substances are widespread utilized, which lead to severe wastewater pollution problem and destroyed ecosystem balance and human being health at an alarming rate. , Nitrophenol (NP), as a typical extremely destructive compound, seriously influences human health, ecology, and environment. Currently, among the numerous detection and removal methods, the catalytic decomposition including photo-degradation and electrolytic reduction has become the most effective removal method, which could convert nitro compounds (4-NP, 2-NP, and 3-NP) into CO 2 or other small organic molecules. − However, their products of the above approaches are very difficult to recycle, leading to the improvement of energy consumption and environmental pressure . Noble metal clusters, as a kind of highly dispersed ultrafine metal nanoparticles (MNPs), have been widely accepted extensive attention by scientists in the past decades.…”

“…2−5 However, their products of the above approaches are very difficult to recycle, leading to the improvement of energy consumption and environmental pressure. 5 Noble metal clusters, as a kind of highly dispersed ultrafine metal nanoparticles (MNPs), have been widely accepted extensive attention by scientists in the past decades.…”