Enhanced Photocatalytic Degradationof Rhodamine-BDye using Photocatalyst ZNO Sensitized by Visible Light

Abstract

In the current study, zinc oxide nanoparticles in different concentrations were synthesized by environmentally friendly biosynthesis method using Argyreia nervosa leaf extract and used to remove Rhodamine-B dye. The structure, optical activity, morphology and porosity of the obtained nanomaterials were determined using different techniques including These include   X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), elemental spectroscopy (EDX), and scanning electron microscopy (TEM), and fluorescence imaging. ultraviolet. The reflection spectroscopy (DRS) and Brunauer-Emmett-Teller (BET), and the zinc oxide chemical bond formations were confirmed by FT-IR, then the XRD results showed that the zinc oxide nanoparticles were successfully synthesized. TEM images of (ZnO-NPs) showed that the majority of the particles were spherical and weakly agglomerated, the best RhB stain removal was approached under ideal conditions (RhB = 5 ppm,10ppm,15ppm, pH = 11, catalyst dose = 1.4 g/L and time irradiation = 180 minutes). The high efficiency of the catalyst showed enhanced photocatalytic behavior for the degradation of RhB dye with a removal rate (48% ) at 5ppm concentration, at a concentration of 10ppm about 31% and at concentration 15ppm the decomposition efficiency is 19%, without using any metal doping

Keywords: green synthesis, ZnO, Photodegradation, RhodamineB, Argyreia nervosa, mechanism.