Green synthesis of TiO <sub>2</sub> nanoparticles from <i>Syzygium cumini</i> extract for photo-catalytic removal of lead (Pb) in explosive industrial wastewater
Naresh K. Sethy, Zeenat Arif, Pradeep Kumar Mishra, Pradeep Kumar
Abstract
Abstract Green synthesis is a simple, non-toxic, economical and eco-friendly approach for the synthesis of nanoparticles. In the present work, nanoparticles of titanium dioxide (TiO 2 NPs) were synthesized using an aqueous solution of Syzygium cumini leaf extract as a capping agent. These green synthesized TiO 2 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 TiO 2 NPs possess spherical morphology with anatase phase with a large BET surface area of 105 m 2 /g. Photo catalytic studies of TiO 2 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 (Pb 2+ ). This application of green TiO 2 NPs is being explored for the first time.