Bimetal–Organic Frameworks for High Efficiency Catalytic Reduction

Abstract

The design of efficient reduction catalysts is crucial for sustainable development in order to reduce waste and protect the environment. Here, an ultrathin bimetallic metal–organic framework (MOF) is synthesized and fabricated as an effective catalyst for the reduction of 4-nitrophenol (which is harmful to the environment) to 4-aminophenol (which is an important chemical and pharmaceutical intermediate). The rapid reduction time of the as-prepared bimetallic CuNi-MOFs is 15 s, and the apparent rate constant is 0.153 s–1, which is far beyond the single-metal MOFs. Ultrafast transition absorption spectra show that Cu doping can induce defect states, which can effectively trap and store long-lived electrons in the catalytic process. X-ray photoelectron spectra verify that Cu doping changes the electron density distribution of CuNi-MOFs. It is believed that the introduction of Cu sites leads to synergistic effects of Cu and Ni sites, which significantly improves the catalytic activity of 4-NP.

Modular preparation of functional bimetallic spinels from metal–organic frameworks: a deep exploration from macro and micro perspectives

“…However, there are few types of MOF precursors used to synthesize excellent bimetallic spinels in the current research. 85,86 Meanwhile, in addition to the solvent method, coprecipitation and the reux method, there are also some synthetic methods of bimetallic MOFs that have not been used in the preparation of bimetallic spinels. 87,88 Furthermore, few researchers have explored the differences between the bimetallic spinels prepared by these different synthetic methods.…”

Fluorophore branching boosted photo-induced energy transfer in UiO-66 for ultrasensitive and instant hydrazine sensing

“…31 By doping Cu into the Ni-based MOF, effective electron accumulation was achieved in ultrathin bimetallic CuNi-MOF, significantly improving the catalytic activity toward 4-nitrophenol. 32 Furthermore, it has been demonstrated that the incorporation of an electron donating group (EDG) or electron withdrawing group (EWG) on ligands could introduce additional energy levels. 33 These energy levels are located between the intrinsic highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels, not only providing an efficient PET path to facilitate excited state migration on the framework, but also notably reducing the non-radiative decay.…”