Fibroin‐functionalized magnetic carbon nanotube as a green support for anchoring silver nanoparticles as a biocatalyst for A³ coupling reaction

Abstract

Novel and powerful fibroin‐functionalized magnetic carbon nanotube–supported silver nanoparticles (CNT–Fe3O4–fibroin–Ag) were successfully synthesized as a nontoxic and inexpensive biocatalyst. The structure of the organic–inorganic hybrid bionanocomposite was characterized by various techniques such as Fourier transform infrared spectroscopy, thermogravimetric analysis, energy‐dispersive X‐ray, field emission‐scanning electron microscopy, transmission electron microscopy, X‐ray diffraction, vibrating sample magnetometry, atomic absorption spectroscopy, and inductively coupled plasma‐optical emission spectrometry. Then, the catalytic activity of synthesized bionanocomposite was evaluated in the three‐component A3 coupling reaction under solvent‐free conditions with good to excellent yields. Several propargylamine derivatives were synthesized by the reaction of different aldehydes with amines and phenylacetylene. Biodegradability, biocompatibility, availability, easy synthesis, high stability, high‐throughput, cost‐effectiveness, and efficient magnetic separation are some advantages of this catalyst that make it economically justified and sustainable. Moreover, the catalyst can be recycled for several runs without appreciable loss in its catalytic activity.

Cu(II)-Based Metal–Organic Framework Loaded with Silver Nanoparticles as a Catalyst for the A3-Coupling Reaction

“…To further assess the composition and chemical valence states, XPS experiments were conducted on 0.5Ag/1 . As shown in Figure a, the whole XPS spectrum of 0.5Ag/1 confirmed the existence of C, N, O, S, Cu, and Ag elements, which was consistent with the EDS and elemental mapping analysis results, and the mass fraction of Ag elements was 0.51% according to the ICP-OES results, and this result is lower than most similar reports ,,− (Tables S3 and S4). The XPS spectra of C 1s could be separated into three peaks at 284.8, 286.64, and 288.85 eV, which corresponded to the CC/C–C, C–N/C–O, and the CO/CN bonds, respectively (Figure b).…”

Collagen and Silk Fibroin as Promising Candidates for Constructing Catalysts

“…Another issue that must be considered at the outset of the catalyst is its recovery and reuse. In 2019, Parisa Akbarzadeh [ 111 ] prepared carbon nanotubes (CNT)-Fe 3 O 4 -fibroin-Ag nanocomposites using fibrin-functionalized magnetic CNT as green carriers for anchoring silver nanoparticles ( Figure 4 ). The introduction of silk fibroin-based magnetic materials enabled continuous recovery and reuse of the catalyst for at least eight reactions without significantly degrading its catalytic performance.…”