Kishore Chand,Cheng Jiao,Muhammad Nazim Lakhan,Ahmer Hussain Shah,Vinod Kumar,Diaa Eldin Fouad,Muhammad Basit Chandio,Asif Ali Maitlo,Mukhtiar Ahmed,Dianxue Cao
This study introduces a new method for synthesizes of silver nanoparticles (AgNPs), prepared within Nigella Sativa (NS) extract. NS extract in the process is more advantageous over other processes because NS acts as a highly efficient stabilizing as well as reducing agents due to highly metabolites like flavonoids, terpenoids, proteins etc. These agents are responsible for the formation of AgNPs and contain reducing and stabilizing properties. The as-obtained AgNPs were investigated by various characterization techniques such as Ultra-visible spectroscopy (UV–Vis), X-ray diffraction (XRD), Dynamic light scattering (DLS), Zeta Potential, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), and high-resolution TEM (HR-TEM) and Brunauer-Emmett-Teller (BET). Fourier transform infra-red (FTIR) analysis was performed to identify the potential bimolecules responsible for the reduction of silver ions. The elemental composition was accomplished by using energy dispersive spectroscopy (EDS). N 2 adsorption-desorption isotherm, pore volume, specific surface area and size of NPs was measured by using BET. The maximum absorbance of UV–Vis was found at 426 nm. TEM, SEM, DLS and BET detected spherical, polydispersed Ag-nano particles with size ranged within 10–12 nm. XRD results demonstrated the formation of well crystallized and smaller nano particles. Furthermore, the synthesized AgNPs exhibited strong photo catalytic activity on degradation of Congo red dye due to high energy and the smaller particles.
Leather is often used to make comfortable shoes due to its soft and breathable nature. However, its innate ability to retain moisture, oxygen and nutrients renders it a suitable medium for the adsorption, growth, and survival of potentially pathogenic microorganisms. Consequently, the intimate contact between the foot skin and the leather lining surface in shoes, which are subject to prolonged periods of sweating, may result in the transmission of pathogenic microorganisms and cause discomfort for the wearer. To address such issues, we modified pig leather with silver nanoparticles (AgPBL) that were bio-synthesized fromPiper betleL. leaf extract as an antimicrobial agent via the padding method. The evidence of AgPBL embedded into the leather matrix, leather surface morphology and element profile of AgPBL-modified leather samples (pLeAg) was investigated using colorimetry, SEM, EDX, AAS and FTIR analyses. The colorimetric data confirmed that the pLeAg samples changed to a more brown color with higher wet pickup and AgPBL concentration, owing to the higher quantity of AgPBL uptake onto the leather surfaces. The antibacterial and antifungal activities of the pLeAg samples were both qualitatively and quantitatively evaluated using AATCC TM90, AATCC TM30 and ISO 16187:2013 test methods, approving a good synergistic antimicrobial efficiency of the modified leather againstEscherichia coliandStaphylococcus aureusbacteria, a yeastCandida albicansand a moldAspergillus niger. Additionally, the antimicrobial treatments of pig leather did not negatively impact its physico-mechanical properties, including tear strength, abrasion resistance, flex resistance, water vapour permeability and absorption, water absorption and desorption. These findings affirmed that the AgPBL-modified leather met all the requirements of upper lining according to the standard ISO 20882:2007 for making hygienic shoes.Keywords:silver nanoparticles;green synthesis;Piper betleL. leaf;pig lining leather;antibacterial activity;antifungal activity
An environmentally friendly and facile method for the synthesis of small-sized Au–Ag alloy nanoparticles is proposed. The method involves the coreduction of HAuCl 4 and AgNO 3 using Lysimachia christinae polysaccharide as reductant and stabiliser at 85°C. The synthesised alloy nanoparticles with a mean diameter of 3.81 nm are stable in solution due to the stabilising effect of the polysaccharide. Furthermore, Au–Ag nanoparticles have first been introduced into cigarette filter to serve as a synergistic catalyst for reducing CO in mainstream smoke.
危险品化学品经营许可证（带存储）