X-ray photoelectron spectra of magnetite nanopowders after chromium(VI) sorption from aqueous solutions

Fe₃O₄ nanopowders prepared by three different procedures (vapor-phase synthesis, chemical precipitation from aqueous solutions, and laser evaporation) have been characterized by X-ray photoelectron spectroscopy before and after chromium(VI) sorption from aqueous solutions. The results demonstrate that, during sorption, the chromium is concentrated in the magnetite at a level of several atomic percent, and its oxidation state is 3+. The mechanism of chromium sorption on magnetite particles is discussed.     

Absorption and luminescence of vanadium(IV) in a K<Subscript>2</Subscript>O-Al<Subscript>2</Subscript>O<Subscript>3</Subscript>-P<Subscript>2</Subscript>O<Subscript>5</Subscript> glass system

Potassium aluminosilicate phosphate glass with the composition 30% K₂O-20% Al₂O₃-50% P₂O₅ (wt %) activated by tetravalent vanadium ions was synthesized and characterized with respect to physicochemical properties, including room temperature luminescence and absorption spectra. Based on the electronic absorption spectra, it is concluded that the glass contains oxovanadium ions.     

Regularities of Chromium(VI) Ions Sorption by Magnetite (Review)

Protection of Metals and Physical Chemistry of Surfaces - The present review is devoted to the sorption properties of magnetite towards hexavalent chromium ions and the possibility of its use as a...     

Sorption Properties of MIU-S Coal Sorbent in Relation to Nickel(II) Ions

Protection of Metals and Physical Chemistry of Surfaces - The physicochemical and sorption properties of MIU-S carbon sorbent have been studied. The studies were carried out on a model solution of...