title: Shape-controlled synthesis of Sn-doped CuO nanoparticles for catalytic degradation of Rhodamine B.
abstract: The uniform Sn-doped CuO nanoparticles were synthesized by a simple solution method at a low temperature. The prepared samples were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron microscopy techniques (HRSEM, HRTEM, SAED, STEM and EDS elemental mapping), atomic force microscopy (AFM), UV/Vis spectroscopy, nitrogen physisorption (BET) and by evaluation of the catalytic activity on the degradation of Rhodamine B. The tin doping had a considerable influence on the morphology of CuO. The gradual narrowing of the particles morphology in the crystallographic [010] direction was observed with increasing the dopant concentration. The plate-like, rectangularsquare and rod-like CuO nanoparticles were obtained. The mechanism of a crystal growth of CuO associated with doping is proposed. The tin doping also affected the structural and optical properties of CuO. Increasing the amount of a dopant led to a red-shift of a band gap from 1.33 to 1.18eV. The incorporation of tin into the structure of copper oxide was confirmed by XRD and distribution of tin mapped by EDS analysis. The good catalytic properties of the as-prepared doped material were demonstrated by the enhanced catalytic removal of Rhodamine B in the presence of H2O2. The undoped CuO nanosheets reached only 24% efficiency in the removal of Rhodamine B within two hours. The best result exhibited CuO_050Sn sample containing 4at.% of tin and the degradation of Rhodamine B reached 99% within the same time. We have demonstrated a simple, scalable process for the preparation of catalytically very active Sn-doped CuO nanoparticles with varying properties.
authors.affiliation: Faculty of Environment, University of Jan Evangelista Purkyně, Ústí nad Labem 400 96, Czech Republic; Department of Materials Chemistry, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Řež 25068, Czech Republic. Electronic address: vomacka@iic.cas.cz.
authors.forename: Petr
authors.initials: P
authors.lastname: Vomáčka
authors.affiliation: Department of Materials Chemistry, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Řež 25068, Czech Republic.
authors.forename: Václav
authors.initials: V
authors.lastname: Štengl
authors.affiliation: Department of Materials Chemistry, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Řež 25068, Czech Republic.
authors.forename: Jiří
authors.initials: J
authors.lastname: Henych
authors.affiliation: Faculty of Sciences, University of Jan Evangelista Purkyně, Ústí nad Labem 400 96, Czech Republic.
authors.forename: Martin
authors.initials: M
authors.lastname: Kormunda
keywords: Catalyst; Catalytic activity; Copper oxide; Morphology; Sn-doped CuO; Tin doping