Abstract
The solid magnetic cobalt ferrite (MCF) nanoparticles prepared with different amounts of tea waste under ultrasound-assisted synthetic method were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), UV-visible (UV-Vis) spectroscopy and Brunauer-Emmett-Teller (BET) method. The XRD data confirm the formation of highly pure MCF nanoparticles. TEM and HR-TEM results predict that the morphology of MCF nanoparticles was changed from spherical to cubic and particle size ranging from 29 to 6.5 nm by increasing the content of tea waste. The surface areas of MCF nanoparticles are also increased from 30.78 to 153.82 m(2) g(-1) by increasing the content of tea waste.