The Effect of Silver Nanoparticles on a Mixture of MB-dye/PVA-Polymer as Determined by Absorption and Emission Spectra Measurements

Abstract

The effect of silver nanoparticles (AgNPs) synthesized via the pulsed laser ablation in liquid (PLAL) technique was investigated for a mixture of PVA/MB solution. Methylene blue dye (MB) and polyvinyl alcohol (PVA) polymer were prepared using distilled water as the solvent in different concentrations (1x10 -4 , 3x10 -4 , 5x10 -4 and 7x10 -4 ) Ml. UV-Vis absorption and fluorescence spectra were recorded to characterize the solutions prepared before and after adding the AgNPs solution. It was observed that the concentration of MB dye had a significant impact on the absorption spectrum of the pure dye. The maximum absorption was obtained at 7x10 -4 Ml at a wavelength of 660 nm. On the other hand, at a fixed concentration of AgNPs, and using a range of MB concentrations, the intensity of the absorption was found to decrease for MB/PVA/AgNps mixture due to the width of the surface plasmon resonance beam. Furthermore, fluorescence spectra showed the same behaviour after adding AgNPs. However, these intensities increase with increasing AgNps particle concentrations, indicating the effect of silver nanoparticles, due to their high surface area, was to show good catalytic activity towards products. The PVA/MB/AgNPs composite could well represent an effective treatment for the removal organic dye in wastewater.

Green Synthesis of CdS Nanoparticles using Avocado Peel Extract

“…Although most of these techniques are still used successfully, there are a considerable number of problems associated with them, such as the need to use various hazardous materials and solvents which may result in biological risk, some of which use high heat or ultrasonic waves that could affect the crystalline structures of the prepared nano-crystals. Furthermore, some nanoparticle preparation techniques employ high-power lasers [28,29] to peel or deposit nanoparticles which incur additional costs or are not safe with such power. An alternative technique can be used to synthesize nanostructures.…”