Adsorption behavior and mechanism of Cr(VI) using Sakura waste from aqueous solution

A forestall waste, Sakura leave, has been studied for the adsorption of Cr(VI) from aqueous solution. The materials before and after adsorption were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). To investigate the adsorption performance of Sakura waste, batch experiments were conducted under different adsorbent dosage, contact time, initial concentration of Cr(VI), and co-existing ions. Results showed the data fitted pseudo-second-order better than pseudo-first-order kinetic model. Equilibrium data was analyzed with Langmuir, Freundlich and Redlich-Peterson isotherm models at temperature ranges from 25 degrees C to 45 degrees C. The maximum adsorption capacity from the Langmuir model was 435.25 mg g(-1) at pH 1.0. The presence of Cl-, SO42- and PO43- would lead to an obvious negative effect on Cr(VI) adsorption, and their influence order follows PO43- > SO42- > CI-. The study developed a new way to reutilize wastes and showed a great potential for resource recycling. (C) 2015 Elsevier B.V. All rights reserved.