One‐Pot Underwater Plasma Synthesis and Characterization of Fe‐ and Ni‐Doped Boehmite

Abstract

This paper presents the one-pot method for the synthesis and doping of boehmite by a reagent-free method using the underwater plasma. Metal wires (Al, Fe, Ni) are used as sources of AlOOH and doping elements. The basic characterization tools have been used to determine the phase composition, particle size, morphology, and surface properties (X-ray diffractions (XRD), X-ray photoelectron spectroscopy (XPS) analysis, thermogravimetric analysis (TG), scanning electron microscopy (SEM), specific surface area). Varying the plasma parameters makes it possible to obtain either doped boehmite or systems of binary oxyhydroxides. The obtained materials are mesoporous, which are capable of removing the Cr(VI). The adsorption of chromium ions is studied as a function of concentration and reaction time. Fe-doped boehmite and Al-Fe oxyhydroxide system show high sorption activity concerning chromium ions (60-100 mg g −1 ). In contrast, materials based on Al-Ni have shown low efficiency as sorbents.