Excellent catalytic activity of magnetically recoverable Fe₃O₄–graphene oxide nanocomposites prepared by a simple method

Abstract

An Fe3O4-graphene oxide nanocomposite has been synthesized via a chemical reaction with a magnetite particle size of 18-25 nm. The resulting nanocomposite can be easily manipulated by an external magnetic field, exhibits excellent catalytic activity and may be reused for several cycles with marginal loss of activity. This recyclable nanocomposite provides an efficient, economic, novel route for multi-component A(3) coupling reactions of aldehydes, amines and alkynes and gives the propargylamine in excellent yields.

2‐Arylation/alkylation of benzothiazoles using superparamagneticgraphene oxide‐Fe3O4 hybrid material as a heterogeneous catalystwith diisopropyl azodicarboxylate (DIAD) as an oxidant

“…The FTIR spectrum of GO‐Fe 3 O 4 hybrid is shown in Figure . The C═O stretching peak of ‐COOH on the GO (see supporting information) in the medium frequency area at 1724 cm −1 is shifted to 1633 cm −1 indicating the formation of ‐COO − after coating with Fe 3 O 4 . The characteristic peak corresponding to the stretching vibration of Fe‐O bond is also shifted toward a higher wavenumber 615 cm −1 compared to 570 cm −1 which was reported for bulk Fe 3 O 4 suggesting that magnetic Fe 3 O 4 is bound to the ‐COO − on the GO surface …”

Fischer–Tropsch synthesis: product distribution, operating conditions, iron catalyst deactivation and catalyst speciation

“…The measurement of the value between the two lattice fringes was obtained (0.251 nm) with the plot profile analysis using ImageJ software. The obtained value, 0.251 nm, approximates value reported in the literature of 0.253 nm [11]. Researchers [11] have reported that the value (approximately 0.25 nm) of the distance between two lattice fringes corresponds to the (311) plane of the magnetite crystal.…”

One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

“…The weak signal at 2θ = 42.47 • corresponds to a (hk0) plane of GO [63]. The reflections of GO disappear after a reaction with 2,2'-(ethylenedioxy)bis(ethylamine) and H 2 O 2 (GQDs) and they are replaced by a broad reflection at 2θ = 25.37 • , which is the typical graphene (002) signature [64]. disappear after a reaction with 2,2'-(ethylenedioxy)bis(ethylamine) and H2O2 (GQDs) and they are replaced by a broad reflection at 2θ = 25.37°, which is the typical graphene (002) signature [64].…”

“…The reflections of GO disappear after a reaction with 2,2'-(ethylenedioxy)bis(ethylamine) and H 2 O 2 (GQDs) and they are replaced by a broad reflection at 2θ = 25.37 • , which is the typical graphene (002) signature [64]. disappear after a reaction with 2,2'-(ethylenedioxy)bis(ethylamine) and H2O2 (GQDs) and they are replaced by a broad reflection at 2θ = 25.37°, which is the typical graphene (002) signature [64]. The 1 H NMR spectrum of GQDs that were dispersed in D2O show strong signals between 3.1 and 4.5 ppm for CH2 groups linked to O or N. A signal for ethylenic H is also observed at 8.11 ppm ( Figure S1).…”