Ultrasound-Assisted Hydrazine Reduction Method for the Preparation of Nickel Nanoparticles, Physicochemical Characterization and Catalytic Application in Suzuki-Miyaura Cross-Coupling Reaction

Abstract

In the experimental work leading to this contribution, the parameters of the ultrasound treatment (temperature, output power, emission periodicity) were varied to learn about the effects of the sonication on the crystallization of Ni nanoparticles during the hydrazine reduction technique. The solids were studied in detail by X-ray diffractometry, dynamic light scattering, thermogravimetry, specific surface area, pore size analysis, temperature-programmed CO2/NH3 desorption and scanning electron microscopy. It was found that the thermal behaviour, specific surface area, total pore volume and the acid-base character of the solids were mainly determined by the amount of the nickel hydroxide residues. The highest total acidity was recorded over the solid under low-power (30 W) continuous ultrasonic treatment. The catalytic behaviour of the nanoparticles was tested in a Suzuki-Miyaura cross-coupling reaction over five samples prepared in the conventional as well as the ultrasonic ways. The ultrasonically prepared catalysts usually performed better, and the highest catalytic activity was measured over the nanoparticles prepared under low-power (30 W) continuous sonication.

Green Synthesis of Nickel Oxide Nanoparticles from Berberis balochistanica Stem for Investigating Bioactivities

“…Based on the results of the present study on phytochemicals with potent antioxidant activities, the BBS extract was selected to use in the green synthesis of NiONPs. Previously, NiONPs have been synthesised by physicochemical and biological methods [ 20 ]. However, the biocompatibility and phytochemical potential of BBS-NiONPs indicate that utilising medicinal plants for green synthesis is a much better strategy to synthesise pure, safe, biocompatible and bioactive NiONPs.…”

Adsorption Behavior of Magnetic Carbon-Supported Metal Nickel for the Efficient Dye Removal from Water

“…Meshkani et al [23] prepared a series of nickel catalysts with different contents of supported mesoporous spherical SiO2 by sol-gel method, and the experimental results showed that the samples prepared with 55% nickel performed the best in the temperature and stability tests. Ádám et al [24] used ultrasound-assisted reduction method to prepare nickel nanoparticles and carried out physical and chemical characterization. The experimental results showed that the ultrasonic prepared nickel nanoparticles had good catalytic activity.…”

Nickel Nanoparticles for Liquid Phase Toluene Oxidation – Phenomenon, Opportunities and Challenges

“…As actual catalysts, nickel nanoparticles (Ni NPs) have well-known popularity in liquid phase redox coupling reactions in conventional solvents such as toluene, alcohols or DMSO. [17,19,22] In our previous work, the desired transformations were indeed feasible in the presence of nickel nanocatalysts. In contrast to the studies reported, a significant but yet unknown rearrangement in the crystal phase of the nickel NPs was observed in parallel with their notable deactivation.…”

“…On the other hand, there was no significant oxidation (either complete or partial) on the metallic surfaces. As actual catalysts, nickel nanoparticles (Ni NPs) have well‐known popularity in liquid phase redox coupling reactions in conventional solvents such as toluene, alcohols or DMSO [17,19,22] . In our previous work, the desired transformations were indeed feasible in the presence of nickel nanocatalysts.…”

“…In contrast to the studies reported, a significant but yet unknown rearrangement in the crystal phase of the nickel NPs was observed in parallel with their notable deactivation. [22] By now, it became evident that the efficiency of nickel catalysis through nanoparticles highly depends on factors such as crystalline size, porosity or electronic structure as well as surface area, etc. [23][24][25][26] Unexpectedly, the face-centred cubic (fcc) crystalline form of Ni NPs was used for the catalysis of the above chemical reactions with almost exclusive selectivity.…”