Abstract
AbstractGreen synthesis is a simple, non-toxic, economical and eco-friendly approach for the synthesis of nanoparticles. In the present work, nanoparticles of titanium dioxide (TiO2 NPs) were synthesized using an aqueous solution of Syzygium cumini leaf extract as a capping agent. These green synthesized TiO2 NPs were further evaluated for photo catalytic removal of lead from industrial wastewater. Obtained nanoparticles were characterized using: high-resolution scanning electron microscopy (HRSEM), high-resolution transmission electron microscopy (HRTEM), X-ray energy dispersive spectroscopy (EDS), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), dynamic light scattering (DLS) and Brunauer-Emmett-Teller (BET). Obtained results revealed that synthesized TiO2 NPs possess spherical morphology with anatase phase with a large BET surface area of 105 m2/g. Photo catalytic studies of TiO2 NPs for lead removal from explosive wastewater were performed in a self-designed reactor. Inductive coupled plasma spectroscopy (ICP) was used to determine the lead concentration. Obtained results witnessed 75.5% removal in chemical oxygen demand (COD) and 82.53% removal in lead (Pb2+). This application of green TiO2 NPs is being explored for the first time.
Highlights
Environmental safety is nowadays a prime global challenge
This sharp decline in concentration was attributed to the photo-catalytic activity of TiO2 NPs on lead ion present in the water sample, whereas in dark condition the minor change in concentration was attributed to the adsorption of Pb on TiO2 surface [35]
Syzygium cumini leaf extract was used for the synthesis of TiO2 nanoparticles by a green approach and the obtained nanoparticles were characterized to evaluate physical, chemical, structural and morphological behavior
Summary
Environmental safety is nowadays a prime global challenge. In this, water pollution is one of the alarming areas. The electron transfer mechanism in TiO2 from valance band to conduction band during exposure to UV or visible light generates a hole (h+), which further contacts with water to form an OH radical This OH radical will act as a strong oxidizing agent and stands responsible for removing organic pollutants, pesticides and heavy metals like lead (Pb) [16] from the waste water through photo oxidation mechanism. Titanium dioxide nanoparticles were synthesized from Syzygium cumini leaf extract using a green synthesis approach. Experimental methodology, characterizations and obtained results were elaborately discussed This is first of its kind work to use green synthesized titanium dioxide nanoparticles as a catalyst for photo catalytic degradation of lead from industrial waste waters.
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