No abstract

No abstract

The present study deals with the synthesis of ZnO and Ag‐ZnO nanoparticles using Excoecaria agallocha leaf extract under a controlled ultrasound cavitation technique. The characterization of the as‐synthesized ZnO and Ag‐ZnO nanoparticles (different molar concentration of Ag) were subjected to Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction analysis (XRD), UV‐Visible Diffuse reflectance spectroscopy (UV‐Vis DRS), Thermogravimetric analysis (TGA), N2 adsorption‐desorption isotherm (BET), scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The photocatalytic performance of ZnO and Ag‐ZnO nanoparticles as catalysts were studied for hazardous organic dyes such as methylene blue (MB) and rhodamine‐B (Rh−B) under solar light irradiation. The degradation study follows pseudo‐first‐order kinetics. The effective degradation of MB was found to be 56.44 % (ZnO nanoparticles) and 98.44 % Ag‐ZnO nanoparticles, respectively at 100 min at the molar ratio (0.25 : 1). Whereas, Rh−B shows 27.50 % (ZnO nanoparticles) and 98.83 % at the same molar ratio of Ag‐ZnO nanoparticles at 80 min. Among the as‐synthesized nanoparticles, Ag‐ZnO at molar ratio 0.25 : 1 shows effective photocatalytic activity. Besides these as‐synthesized nanoparticles exhibited good antimicrobial activity with an increase in Ag nanoparticles decorated into ZnO. A similar trend was observed in antioxidant and anti‐inflammatory activity.

No abstract

In the present work, a simple synthetic route was reported for the preparation of azo oxime based Schiff base ligands and their Ni(II), Cu(II) and Zn(II) complexes. 2-hydroxy-3-methoxy-5-(phenyldiazenyl)benzaldehyde oxime (HL 1 ) ligand was synthesized by condensing 2-hydroxy-3-methoxy-5-(phenyldiazenyl) benzaldehyde and hydroxyl amine hydrochloride in the molar ratio 1:1. Nitro and chloro substituted ligands, 2-hydroxy-3methoxy-5-((4-nitro-phenylazo)benzaldehyde oxime (HL 2 ) and 2-hydroxy-3-methoxy-5-(2-chloro-phenylazo)benzaldehyde oxime (HL 3 ) respectively, were also synthesized by the same method. The synthesized ligands were used to prepare metal complexes of Ni(II), Cu(II) and Zn(II) which were characterized by various analysis techniques. Ligands and their metal complexes were tested for their in vitro antibacterial and antioxidant activities. Ligands shows good antibacterial activity and it increases remarkebly after metal complexetion with MIC (Minimum inhibitory concentration) ranging from 3.90 μM/mL to 125 μM/mL for Zn(II) metal complexes over standard broad spectrum drug chloramphenicol having MIC 386 μM/mL against gram positive as well as gram negative bacteria. Synthesized ligands showing good antioxidant property which is comparable to that of natural antioxidant Ascorbic acid.[a] M. S. Kasare, Dr.