XPS and structural studies of Fe3O4-PTMS-NAS@Cu as a novel magnetic natural asphalt base network and recoverable nanocatalyst for the synthesis of biaryl compounds

Abstract

In this research, natural asphalt as a mineral carbonuous material was converted to sodium natural asphalt sulfonate (Na-NAS) and, then, was linked to Fe3O4 MNPs in order to synthesize the magnetic nanocatalyst. Afterwards, Cupper (I) and Cu (II) was grafted on Fe3O4-PTMS-NAS. Moreover, it is worth mentioning that the synthesized the novel magnetic nanocatalyst (Fe3O4-PTMS-NAS@Cu) was successfully used in Suzuki and Stille coupling reactions. The Fe3O4-PTMS-NAS@Cu MNPs were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), inductively coupled plasma (ICP), BET and X-ray photoelectron spectroscopy (XPS) analysis. Besides, sulfonation of natural asphalt, magnetization of catalyst, grafting of Cu (I) and Cu (II) to NAS and catalyst formation were investigated and proved carefully. This nanocatalyst can be comfortably separated from the reaction medium through an external magnetic field and can also be recovered and reused, while maintaining its catalytic activity.

A novel lateral flow immunoassay strip based on a label-free magnetic Fe3O4@UiO-66-NH2 nanocomposite for rapid detection of Listeria monocytogenes

“…2f, the peaks of Fe 3 O 4 NPs at binding energies of 712.2 eV, 532.3 eV, and 286.1 eV were attributed to Fe 2p, O 1s, and C 1s, respectively. 34 Besides, the pattern of Fe 3 O 4 @UiO-66-NH 2 showed new peaks at 399.9 eV and 183.8 eV, whose high-resolution pattern was shown in the inset image, proving the successful synthesis of Fe 3 O 4 @UiO-66-NH 2 . 35…”

“…Analytical Methods attributed to Fe 2p, O 1s, and C 1s, respectively. 34 Besides, the pattern of Fe 3 O 4 @UiO-66-NH 2 showed new peaks at 399.9 eV and 183.8 eV, whose high-resolution pattern was shown in the inset image, proving the successful synthesis of Fe 3 O 4 @UiO-66-NH 2 . 35 N 2 adsorption-desorption was performed to investigate the Brunauer-Emmett-Teller (BET) surface and pore volumes of Fe 3 O 4 NPs and Fe 3 O 4 @UiO-66-NH 2 .…”

Fabrication of Red Blood Cell-Mimicking Janus Microparticles with Enhanced Upconversion Luminescence and Drug Delivery Performance Using Double-Needle Electrospray

“…XPS in Figure D was used to determine the binding energy of elements O and C assigned to PLGA. However, no obvious peaks at ∼711 eV for element Fe and ∼684 eV for element F were observed, possibly due to the fact that only a very few Fe 3 O 4 MNPs or NaYF 4 :Yb 3+ ,Er 3+ UCNPs were dispersed on the surface of JMPs, indicating that they were almost encapsulated by PLGA.…”

Immobilization of Cr (III) on the surface of natural asphalt sulfonic acid (NASA): novel and efficient nanocatalyst for the oxidation of sulfides

“…Silica has the lower thermal stability than carbon substrates and Al 2 O 3 although has good thermal and mechanical stability but in recycling it cannot compete with carbon. Carbon substrates in catalytic applications have advantages such as high surface area, stability in acidic and alkaline environments, appropriate pore size distribution for speci c reactions, stable structure at high temperatures and lower cost in compare to alumina and silica substrates [7][8][9][10][11][12][13][14][15].…”