Green synthesis and catalytic application of curcumin stabilized silver nanoparticles

Abstract

An ultrasonication based green synthesis approach was used to prepare curcumin-stabilized silver nanoparticles (c-AgNPs). Nanoparticles thus obtained were characterized by UV-Visible spectroscopy, X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). Two different size distributions of c-AgNPs were obtained by changing the ratio of curcumin to silver salt precursor. These c-AgNPs were used as catalysts in the catalytic reduction of p-nitrophenol to p-aminophenol. The c-AgNPs with narrower size distribution exhibited better catalytic activity as well as lower activation energy. Variation of apparent rate constant with the reactant concentration agreed with the Langmuir-Hinshelwood (LH) model. Consequently, the surface rate constant related to the rate-determining step and the respective adsorption constants of p-nitrophenol and of borohydride were determined as per this model.

Plant‐supported silver nanoparticles: Efficient, economically viable and easily recoverable catalyst for the reduction of organic pollutants

“…TOF is defined as the moles of reactant used in a given chemical reaction per mole of catalyst per unit time when the reduction reaches to 90%. The following expression was used to calculate the TOF: The calculated TOF of Ag/GP for reduction of 4‐NP and 2‐NP is presented in Table and compared with the results of some recent literature. Our study shows higher TOF.…”

Curcumin‐Functionalized Ag/Ag2O Nanocomposites: Efficient Visible‐Light Z‐scheme Photocatalysts

“…However, in all cases, the amount of curcumin taken was lesser than that required for complete reduction of silver salt. This was calculated from the synthesis protocol given in reference for preparation of curcumin‐stabilized Ag nanoparticles . The basis of this synthesis protocol was that initially silver will be reduced resulting in the formation of small Ag seeds.…”

“…This study first presents the single‐step green synthesis of Ag/Ag 2 O nanocomposite particles, with curcumin acting as the reducing as well as stabilizing agent. Curcumin has a conjugated molecular structure and multifunctional groups which are responsible for its reducing and capping ability . On taking lesser amounts of curcumin in different syntheses, less of reduced Ag and more of Ag 2 O were obtained.…”

Novel protocol for synthesis of 1,4-diiminocurcumin stabilized silver nanoparticles and application as heterogenous recyclable catalyst and antibacterial agent

“…Native curcumin and its nanocomposite are found to act as stabilizers in preparation of AgNPs. 14,36,40,41 In this work, synthesis of a novel Schiff base of curcumin (Cur-1,4) with 1,4-diaminobutane (having a biological origin, putrescine) is reported. The synthesized Schiff base, Cur-1,4, shows enhancement in aqueous solubility compared to curcumin.…”

“…All the major peaks in XRD pattern at 2h ¼ 38:18 , 44:29 , 64:43 , 77:48 and 81:54 corresponding to the crystal planes (111), (200), (220), (311) and (222) of silver are observed and are in a good agreement with Joint Committee on Powder Diffraction Standards (JCPDS) silver file No. 04-0783 40,45. The crystalline nature of synthesized AgNPs is reflected from the high intensity of peaks as observed from the XRD image and the relative high intense peak is for (111) Bragg reflection.…”