title: Surface properties and photocatalytic activity of KTaO3, CdS, MoS2 semiconductors and their binary and ternary semiconductor composites.
abstract: Single semiconductors such as KTaO3, CdS MoS2 or their precursor solutions were combined to form novel binary and ternary semiconductor nanocomposites by the calcination or by the hydro/solvothermal mixed solutions methods, respectively. The aim of this work was to study the influence of preparation method as well as type and amount of the composite components on the surface properties and photocatalytic activity of the new semiconducting photoactive materials. We presented different binary and ternary combinations of the above semiconductors for phenol and toluene photocatalytic degradation and characterized by X-ray powder diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) specific surface area and porosity. The results showed that loading MoS2 onto CdS as well as loading CdS onto KTaO3 significantly enhanced absorption properties as compared with single semiconductors. The highest photocatalytic activity in phenol degradation reaction under both UV-Vis and visible light irradiation and very good stability in toluene removal was observed for ternary hybrid obtained by calcination of KTaO3, CdS, MoS2 powders at the 10:5:1 molar ratio. Enhanced photoactivity could be related to the two-photon excitation in KTaO3-CdS-MoS2 composite under UV-Vis and/or to additional presence of CdMoO4 working as co-catalyst.
authors.affiliation: Department of Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, ul. G. Narutowicza 11/12, Gdansk 80-233, Poland. beatabajorowicz@gmail.com.
authors.forename: Beata
authors.initials: B
authors.lastname: Bajorowicz
authors.affiliation: Department of Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, ul. G. Narutowicza 11/12, Gdansk 80-233, Poland. anna-cybula@wp.pl.
authors.forename: Anna
authors.initials: A
authors.lastname: Cybula
authors.affiliation: Department of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdansk University of Technology, ul. G. Narutowicza 11/12, Gdansk 80-233, Poland. mwiniarski@mif.pg.gda.pl.
authors.forename: Michał J
authors.initials: MJ
authors.lastname: Winiarski
authors.affiliation: Department of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdansk University of Technology, ul. G. Narutowicza 11/12, Gdansk 80-233, Poland. tomasz.klimczuk@pg.gda.pl.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Klimczuk
authors.affiliation: Department of Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, ul. G. Narutowicza 11/12, Gdansk 80-233, Poland. adriana.zaleska@pg.gda.pl.
authors.forename: Adriana
authors.initials: A
authors.lastname: Zaleska
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D002384:Catalysis; D008855:Microscopy, Electron, Scanning; D008982:Molybdenum / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010777:Photochemistry; D011188:Potassium / Q000737:chemistry*; D033362:Powder Diffraction; D012666:Semiconductors; D013056:Spectrophotometry, Ultraviolet; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties; D013635:Tantalum / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D010087:Oxides; D013440:Sulfides; C516825:potassium tantalate oxide; C034939:cadmium sulfide; D013635:Tantalum; D008982:Molybdenum; D011188:Potassium