Nowadays silver nanoparticles are produced by different chemical methods. Which have disadvantages such as instability of the solution and also require advanced equipment for production. So, green synthesis routes have attracted the attention of researchers for producing nanoparticles that have the minimum environmental hazards and require simple equipment for production. Herbal extracts can be used as a green route to synthesize silver nanoparticles. In this work, synthesis of silver nanoparticles was carried out using Thymbra spicata L. herbal extract (with the local name of zoofai). Silver nitrate was added to the extract and the effect of silver nitrate concentration, volume of the extract, temperature and time on silver nanoparticles synthesis was investigated. The synthesized nanoparticles have been characterized by UV-Vis spectroscopy, transmission electron microscopy (TEM), XRD, DLS, scanning electron microscopy (SEM), X-ray diffraction spectroscopy (EDX), and FT-IR. At UV-Visible spectrum, the presence of a peak at 430 nm indicates the biological synthesis of this nanoparticle in the presence of extract, and TEM image showed the spherical shape for the nanoparticle. Particle size distribution and average particle size were found to be about 40 nm by DLS. XRD image confirmed face-centered cubic nanocrystals with an average size of 21.3 nm, and SEM images were also well-matched with TEM and XRD images. Many organic dyes, such as methylene blue cationic dye, are toxic, carcinogenic and non-degradable because of their complex aromatic structure and high solubility in water. Therefore, it is necessary to remove them from wastewater. In this study, the efficiency of nanoparticles in the removal of methylene blue from water was also investigated by changing some parameters such as silver nanoparticle dosage, concentration of methylene blue and time, and it was found that the removal procedure is well done.
Authors:Tayeb AB Matin, Nahid Ghasemi, Keivan Ghodrati, Majed Ramezani