Magnetically palladium catalyst stabilized by diaminoglyoxime-functionalized magnetic Fe 3 O 4 nanoparticles as active and reusable catalyst for Suzuki coupling reactions

In this work, the photocatalytic activity of the synthesized graphene oxide (GO)‐Fe3O4/TiO2 mesoporous photocatalysts was evaluated using chlorpyrifos (CP) as a contaminant. The nano‐photocatalyst was characterized by X‐ray diffraction, field emission scanning electron microscopy with energy‐dispersive X‐ray spectroscopy, transmission electron microscopy, and specific surface area by the Brunauer–Emmett–Teller method. Using visible light, the GO‐Fe3O4/TiO2 mesoporous photocatalyst was investigated on the degradation of CP pesticide. The GO‐Fe3O4/TiO2 photocatalyst displayed a good photocatalytic activity, which was achieving 97% of CP degradation after 60 min. Finally, experiments were performed to evaluate GO‐Fe3O4/TiO2 mesoporous nanocatalyst activity on repeated applications; after several uses, its photocatalytic activity was retained, which indicated stability.

Section: Introductionmentioning

confidence: 99%

Evaluating the efficiency of the GO‐Fe₃O₄/TiO₂ mesoporous photocatalyst for degradation of chlorpyrifos pesticide under visible light irradiation

Zangiabadi

Shamspur

Saljooqi

et al. 2019

“…Among the two main catalysts, homogeneous and heterogeneous, homogeneous catalysts, have various benefits. But heterogeneous catalysts are widely applied due to their easy recovery .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Fe₃O₄@SiO₂@DOPisatin‐Ni(II) and Cu(II) nanoparticles: Highly efficient catalyst for the synthesis of sulfoxides and disulfides

Hajjami

Sharifirad

Gholamian

2017

M = Ni, Cu) was investigated in the environmentally green H 2 O 2 oxidantbased oxidation of sulfides to sulfoxides and oxidative coupling of thiols to disulfides. By using these catalysts, various substrates were successfully converted into their corresponding product. These catalysts could also be reused multiple time without significant loss of activity. The physical and chemical properties of the catalysts were determined using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), energy dispersive X-ray spectroscopy (EDX) and atomic absorption spectroscopy (AAS).

“…Broad reflection under 2θ = 30 ° attributed to the amorphous silica that covered the reduced graphene oxide reflection about 2θ = 26 °. Moreover, the appearance of the new reflection at 2θ = 40 ° is attributed to the Pd NPs, that corresponding to the (1 1 1) in the pattern of Pd …”

Section: Resultsmentioning

confidence: 91%

Pd embedded N, S co‐doped graphene wrapped core‐shell magnetic nanospheres: Engineered stable nanocatalyst for Suzuki couplings

Rohani

Ziarani

Badiei

2019

Designed nitrogen and sulfur co‐doped graphene wrapped magnetic core‐shell supported Pd nanoparticles were synthesized through the following steps. Firstly, Fe3O4 was prepared, coated with silica and then functionalized with amine groups to create a positive charge on the structure for enhancing the interaction of the Fe3O4@SiO2 with graphene oxide. Secondary, the pre‐catalyst wrapped with graphene to enhance adsorption of aromatic substrates through π–π stacking. Thirdly, graphene was doped with nitrogen and sulfur to increase the grafting of Pd in hybrid. Finally, Pd NPs were attached on the surface of pre‐engineered structure to produce Fe3O4@SiO2@N,S‐wG@Pd which exhibited high performance in Suzuki reactions. This superior activity can be indexed to the incorporation of N and S atoms into graphene led to high anchoring and well‐dispersion of Pd NPs on the nanocomposite surface offering large amounts of active centers, that strongly increased the interaction between Pd and substrates to decreases Pd leaching.