In Situ Green Synthesis of Pd Nanoparticles on Tannic Acid‐Modified Magnetite Nanoparticles as a Green Reductant and Stabilizer Agent: Its Application as a Recyclable Nanocatalyst (Fe₃O₄@TA/Pd) for Reduction of 4‐Nitrophenol and Suzuki Reactions

Abstract

Tannic acid, as a humic‐like substance with phenolic hydroxyl and carbonyl functional groups, can modify surface of Fe3O4 NPs. Moreover, it can improve surface properties and capacity of Fe3O4 for adsorption and reduction of palladium ions through complexing with them, in aqueous solutions. Therefore, Fe3O4@TA NPs have potentials of reducing, stabilizing and immobilizing palladium nano particles to generate novel magnetic palladium nanocatalysts. Inductively coupled plasma (ICP), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X‐ray photoelectron spectroscopy (XPS), energy‐dispersive X‐ray spectrum (EDS), vibrating sample magnetometer (VSM) and Fourier transform infrared (FTIR) methods unraveled the catalyst properties. Investigation of Fe3O4@TA/Pd NPs performance illustrated its recycle nature and high catalytic activity towards Suzuki‐Miyaura cross‐coupling reactions and reduction of 4‐nitrophenol (4‐NP), at room temperature.

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

“…Next, 10 mL concentrated NH 3 was slowly added to the above mixture and stirred at 60°C for 1 hr. The precipitate was then separated by the external magnet and rinsed with distilled water, and finally dried c)Synthesis of GO‐Fe 3 O 4 /TiO 2 mesoporous photocatalyst For the synthesis of TiO 2 mesoporous, 25 mL absolute ethanol, 3.4 mL H 2 O and 0.5 mL HCl were added to 3.8 mL titanium tetraisopropoxide and stirred until the clear solution was obtained.…”

Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe3O4/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

“…Hence, a pseudo‐first‐order kinetic equation can be used. The apparent rate constants for the MO reduction are 23 × 10 −3 s −1 (1 mg), 26 × 10 −3 s −1 (2 mg), and 77 × 10 −3 s −1 (3 mg), calculated from the slope of the ln( A t / A 0 ) versus time plot in Figure …”

Encapsulation of a Palladium Schiff‐Base Complex into the Nanocages of Mesoporous SBA‐16 as an Efficient Heterogeneous Catalyst for the Suzuki‐Miyaura Coupling Reaction in Water

“…Generally, the homogeneous palladium catalysts exhibit excellent activity and selectivity for the Suzuki‐Miyaura reaction owing to their uniformity on a molecular level and solubility in the reaction medium. Even so, the efficient separation and subsequent recycling of such expensive catalysts has remained a great challenge . Thus, recently, there has been an explosion in the development of heterogeneous catalytic systems in which palladium complexes are immobilized on various organic and inorganic supports to realize the ease of catalyst separation and recycling .…”