Biosynthesis of TiO2 nano particles by using Rosemary (Rosmarinus officinalis) leaf extracts and its application for crystal dye degradation under sunlight

Abstract

Abstract Titanium dioxide (TiO 2 ) nanoparticles were prepared through Rosmarinus-officinalis leaf extracts at 90 and 200°C. In this research, the degradations of methylene blues by using TiO 2 nanoparticles Sun light radiations were studied. The synthesized materials were characterized using XRDs, UV-Vis, PL, SEM, TEM, EDS and XPS. The results displayed that bio-synthesis temperatures intrude the shapes and sizes of TiO 2 nanoparticles. For TiO 2 -90, micrographs show separable crystalline with irregular morphologies and agglomerate cubic particles. For the other TiO 2 -200 sample, SEM and TEM micro-imaging shows crumbly agglomerated cubic structures. The XRD shows that the intense peaks observed at angles of 25.37°, 37.19°, 47.81° and 53.89° confirming a highly crystalline oriented as (004), (200), and (105) planes respectively. The optical properties of TiO2 nanoparticles synthesized were conveyed by PL and UV-Vis. The energy band gap calculated was 3.0 eV for both samples; that indicates heating temperature didn’t influence the band gap of the samples. The elemental composition Ti and O 2 is shown by EDS and XPS. Photo-catalytic experiments discovered that TiO 2 -90 nanoparticles were well-organized in photo-degradations of MB, likened to TiO 2 -200. The great activities of TiO 2 -90 were because of better physicochemical characteristics associated with TiO 2 -200 effectively degrading MB under photo-light. Photo-degradations of dye under sunlight as plentifully obtainable energy sources by TiO 2 , synthesized by simpler techniques, can be hopeful to grow an eco-friendly and economical process.