Green facile synthesis of Ag-doped ZnO nanoparticles from Gymnema sylvestre leaf extract and investigation of their Antibacterial activity

The unique characteristics of the green synthesis pathway have opened the way for a new field of scientific investigation. The current study used green chemistry methodologies to produce pure zinc oxide (ZnO) (G1) and silver doped zinc oxide (Ag doped ZnO) (G2) nanoparticles (NPs) using Gymnema sylvestre (G. sylvestre) leaf extract as a reducing as well as capping agent. XRD, FESEM, EDAX, and FT-IR investigations were used to investigate the structural characterization of G1 and G2 NPs. The UV–Vis and PL analyses were used to examine the optical characteristics. The results clearly reveal that the leaf extract is the best possible stabilizing agent for the manufacture of G1 and G2 NPs, and that the generated nanoparticles operate as potent microbial agents, inhibiting the growth of a variety of dangerous microbes. Due to their eco–friendly and non–toxic compatibility, the prepared G1 and G2 NPs can be employed for therapeutic and other purposes

Sequential decarboxylative azide–alkyne cycloaddition and dehydrogenative coupling reactions: one-pot synthesis of polycyclic fused triazoles

Herein, we describe a one-pot protocol for the synthesis of a novel series of polycyclic triazole derivatives. Transition metal-catalyzed decarboxylative CuAAC and dehydrogenative cross coupling reactions are combined in a single flask and achieved good yields of the respective triazoles (up to 97% yield). This methodology is more convenient to produce the complex polycyclic molecules in a simple way

Investigation of the morphological, optical and antimicrobial properties of Nd-doped ZnO nanoparticles using Hemidesmus indicus (L.) R. Br. Root extracts

In the current study, we present a low-cost, novel, and straightforward method for the biopreparation of zinc oxide nanoparticles (ZnO NPs) and neodymium (Nd3+) doped ZnO NPs using extracts of Hemidesmus indicus (H. indicus) (L.) R. Br. root like a sustainable reducing as well as coating agent. Rietveld’s analysis of the XRD data showed that ZnO and Nd3+ doped ZnO NPs have a hexagonal wurtzite crystalline level. The morphological representation of synthesized NPs was analyzed by FESEM and chemical composition by EDAX. The different vibrational frequencies were assigned for the FT-IR spectra. The Optical behaviour of the prepared NPs be present studies by UV–visible spectroscopy. Moreover, this study concludes the antimicrobial efficiency of the synthesized NPs opposed to standard and clinical strains of Staphylococcus aureus (gram-positive) and Klebsiella pneumoniae (gram-negative) bacterial strains using the well diffusion method

Grey, blue, and green hydrogen: A comprehensive review of production methods and prospects for zero-emission energy

Energy is the linchpin for economic development despite its generation deficit worldwide. Hydrogen can be used as an alternative energy source to meet the requirement that it emits zero to near-zero impurities and is safe for the environment and humans. Because of growing greenhouse gas emissions and the fast-expanding usage of renewable energy sources in power production in recent years, interest in hydrogen is resurging. Hydrogen may be utilized as a renewable energy storage, stabilizing the entire power system and assisting in the decarbonization of the power system, particularly in the industrial and transportation sectors. The main goal of this study is to describe several methods of producing hydrogen based on the principal energy sources utilized. Moreover, the financial and ecological outcomes of three key hydrogen colors (gray, blue, and green) are discussed. Hydrogen’s future prosperity is heavily reliant on technology advancement and cost reductions, along with future objectives and related legislation. This research might be improved by developing new hydrogen production methods, novel hydrogen storage systems, infrastructure, and carbon-free hydrogen generation

Identification of bioactive compounds from the methanolic leaf extract of Gymenema Sylvestre

This study was aimed to analysis of potential bioactive phytoconstituents from the methanolic leaf extract of Gymnema sylvestre. Qualitative phytochemical screening of this plant confirms the presence of various secondary metabolites like steroids, alkaloids, saponins, tannins, ester, phenol and flavonoids. Gas chromatography mass spectroscopy analysis (GC-MS) also confirmed the presence of various phytochemical compounds with different chemical structure

Synthesis of Mg2+ doped NiO nanoparticles and their structural and optical properties by Co-precipitation method

Nanocrystalline Magnesium-doped NiO nanoparticles (Mg2+ doped NiO NPs) were synthesized by co-precipitation method. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet- visible spectrometer (UV-Vis) and Tunneling electron microscopy (TEM) with EDAX specifications. XRD pattern reveals that Mg2+ doped NiO nanoparticles belongs to the face centered cubic crystal structure with the space group of Fm-3m. Electron microscopy studies clearly evidence the formation of cubical edged nanoparticles with an average particle size of 21.49 nm, emerges in the polycrystalline nature. UV-Visible absorption spectra of Mg2+ doped NiO nanocrystals shows an absorption peak at 289nm. The bandgap value is calculated to be 4.8 eV

Synthesis, characterization and biological activity of some novel benzimidazole derivatives

<div align="justify">The reaction of <em>o</em>-phenylenediamine with anthranillic acid yield compound 2-(1H-benzo[d]imidazol-2-yl)aniline (AOP). The compound AOP was condensed with aromatic acid chlorides in the presence of pyridine to get compound <em>N</em>-(2-(1H-benzo[d]imidazol-2-yl)phenyl) benzamide (AB). Further it to then treated with PCl5 to get an intermediate compound then reacted with NaN3 to yield compound 2-(2-(5-phenyl-1H-tetrazol-1-yl)phenyl)-1H-benzo[d]imidazole (ABC). The compounds were synthesized in good yields and their structures were confirmed by IR, 1H-NMR, 13C-NMR spectral data and elemental analysis. Antimicrobial activity against bacteria and fungi was studied. The results of preliminary biological tests showed that of these compounds possess good biological activities.</div

Highly efficient one-pot synthesis of fused pyrimidones from 2-heteroaryl amines and Morita–Baylis–Hillman carbonates <i>via</i> intermolecular cyclocondensation

<p>A highly selective and efficient cyclocondensation reaction for construction of various 3-substituted-2<i>H</i>-pyrido[1,2-<i>a</i>]pyrimidin-2-ones and related fused pyrimidones from allylic carbonates and 2-heteroaryl amines has been developed. The transformation involves one-pot sequential aza-Michael addition, intramolecular acyl substitution, and [1,3]-<i>H</i> shift. The method is catalyst free, eco-friendly, scalable, and completes within a short reaction time, with no work-up, no column purification, and demonstrate a broad functional group tolerance.</p

Evaluation of graphical and multivariate statistical methods for classification and evaluation of groundwater in Alathur block, Perambalur District, India

This paper assesses the quality of water using different graphical and statistical methods like Durov, Schoeller, Piper – Tri linear diagram, Box and Whisker plot for three seasons in the study area Alathur block, Perambalur District. The graphical representation provides limitations compared with the multivariate method for large data sets. A total of 10 groundwater samples were collected from hand dug wells in this area and they were analyzed for various physical and chemical parameters. The sequence of the dominance of the major ions are in the following order Na+> Ca2+> Mg2+> K+and Cl-> SO42-> HCO3-> NO3-. The dominating hydrochemicals of facies of groundwater are Ca-Cl and mixed Ca-Mg-Cl and alkaline earth metals (Ca2+, Mg2+) and strong acids (SO42-, Cl-) that dominate over alkalis (Na+, K+) and weak acids like HCO3-, CO3-. Based on the analytical result, groundwater in the study area is generally hard to very hard, slightly alkaline to brackish in nature. This indicates that leaching of salts, rock weathering and evaporation are among the most dominant processes in controlling water quality. For industrial purposes, the quality of water was assessed by using the Langeliner saturation index (LSI) and Ryznar saturation index (RSI). Seasonal variations in different parameters were also determined