In this study, we investigated the synthesis of silver nanoparticles using Peganum harmala water extract at ambient temperature. The Ag nanoparticles (AgNPs) were characterized by ultravioletvisible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM). The average particle size of the silver nanoparticles was about 23 nm. Inhibitory activity of the synthesized AgNPs was tested against human pathogens like Escherichia coli and Staphylococcus aureus. The results indicated that the AgNPs showed moderate inhibitory actions, demonstrating its antibacterial value against pathogenic diseases.
ARTICLE HISTORY
As a novel strategy involving dry NaOH sorbent for CO2 capture from air is described. The influence of significant operating parameters, namely the temperature, pressure, and NaOH loading, on the CO2 capture in a fixed‐bed reactor is experimentally explored using the response surface methodology (RSM). Accordingly, in this paper, RSM based on central composite design (CCD) is exploited to design experiments, build models, and determine the optimum conditions for desirable responses. The NaOH sorbent was then characterized by various approaches such as Fourier transform infrared spectroscopy and X‐ray diffraction analysis before and after the reactions. Besides, numerous isotherm models were applied to mathematically model the CO2 adsorption, and on the basis of the regression coefficient (R2), the Frendlich model was found to deliver a perfect fit to the experimental data, based on the closeness of the R2‐value to unity. In addition to the experiments, the kinetic parameters were evaluated using a nonlinear least squares technique. The outcome achieved in this investigation can serve as a benchmark while searching for inexpensive and superior dry NaOH sorbent production in future studies.
The aqueous extract of Tarragon, as a reducing agent, was used to synthesize silver-montmorillonite (MMT) nanocomposite (Ag-MMT-NPs) in the batch method. The leaf extract and metal solution concentrations were optimized to improve Ag-MMT-NPs synthesis in 48 h. For characterizing the nanocomposite, powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), and UV-Vis spectroscopy were performed. The peak was observed at 437 nm on the UV-Vis spectrum, showing the surface plasmon resonance of Ag-MMT-NPs. Using XRD analysis, the crystalline nature and purity of Ag-MMT-NPs were confirmed. FTIR was used to evaluate specific functional groups, causing a reduction in silver nitrate during Ag-MMT-NPs formation. According to TEM, the average particle size was 25.12 nm in AgNPs. The nanocomposite showed antibacterial properties against Gram-negative and Gram-positive bacteria (Escherichia coli and Staphylococcus aureus).
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