Decorated‐magnetic‐nanoparticle‐supported bromine as a recyclable catalyst for the oxidation of sulfides

Abstract

Herein, we present a strategy for supporting bromine as a catalyst for the oxidation of sulfides. In this strategy, branched poly(ethylene imine) was first decorated by magnetic oxide and then used to support liquid bromine to obtain solid polymeric bromine (M@PEI@Br) nanoparticles. Compared with free bromine, the stability of the M@PEI@Br nanoparticles improved obviously. The oxidation of thioanisole to methyl phenyl sulfoxide was chosen as a reaction model to evaluate the catalytic activity of the M@PEI@Br nanoparticles. All of the obtained results verify that the M@PEI@Br nanoparticles exhibited excellent catalytic efficiency and could accelerate the oxidation process under solvent-free conditions at room temperature; this highlighted the potential of decorated polymers to support active and unstable small-molecule organic catalysts.

Magnetic nanoparticles in nanomedicine: a review of recent advances

“…Their unique characteristics such as high surface to volume ratio and size-dependent magnetic properties are drastically different from those of their bulk materials. MNPs have been receiving tremendous attention in multiple areas such as data storage, spintronics, catalyst, neural stimulation, and gyroscopic sensors, etc [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In this review, the physical properties of MNPs such as saturation magnetization and magnetic anisotropy are given in section 2.1.…”

Fabrication of a Double Core–Shell Particle-Based Magnetic Nanocomposite for Effective Adsorption-Controlled Release of Drugs

“…By looking into the spectra of TGA analysis given in Figure 4, we can observe two degradation stages for IONPs and IONPs@SiO 2 . In the first stage, the weight loss of IONPs at 125 • C is due to the loss of water molecules attached to the surface of the IONPs, while in the second stage the weight loss at 170 • C and 360 • C is due to the transformation of crystal from Fe 3 O 4 to γ-Fe 2 O 3 caused by heating, and only a 5% decrease in the weight of the composite occurs [47]. In the case of IONPs@SiO 2 , in the first stage, 2% weight loss occurs up to 230 • C due to the loss of any remaining water and volatile molecules, and then the weight loss decreases by 12% due to the conversion of Fe 3 O 4 to γ-Fe 2 O 3 at 360 • C, followed by no significant weight loss, indicating a higher degree of thermal stability [48].…”

Improving the Electrochemical Performance of Li–S Batteries via a MnCo2S4–CoS1.097 Heterostructure with a Hollow Structure and High Catalytic Activity

“…20 More recently, many burgeoning heterostructures, such as CoS 2 −Fe 7 S 8 , 21 Especially, since metal sulfide is usually unstable and produces a variety of crystal defects, which will be propitious for the formation of a great quantities of active sites and metal cations with different valence states that can promote the catalytic reaction, metal sulfide has a unique charm for the LiPS catalytic conversion reaction. 28 Therein, MnCo 2 S 4 is diffusely used in the areas of electrode materials due to its highly exposed edge sites with high catalytic activity and the synergistic effect between Co and Mn. 29 Besides, CoS 1.097 exhibits rapid electron transfer pathways and an excellent redox reaction.…”