Enhanced removal of iodide from aqueous solution by ozonation and subsequent adsorption on Ag-Ag2O modified on Carbon Spheres

摘要

In this work, Ag-Ag2O coated on carbon spheres (Ag-Ag2O-CSs) as an effective adsorbent was successfully synthesized, the morphologies and structure of the as-fabricated composites were characterized through SEM, XRD and XPS. Ozonation and subsequent adsorption on Ag-Ag2O-CSs was used to removal of iodide from aqueous solution. Furthermore, the ozonation and adsorption process is slightly influenced in the presence of large concentrations of competitive anions, and the Ag-Ag2O-CSs displayed better adsorption ability at optimum conditions of pH 2.1. The equilibrium isotherms data for iodine adsorption onto Ag-Ag2O-CSs was best fitted with Freundlich isotherm and the adsorption capability was 374. 91 mg/g. The adsorption kinetics followed the pseudo-second-order kinetics. The thermodynamic have revealed that the adsorption process is endothermic and favorable. (C) 2017 Elsevier B.V. All rights reserved.