Cobalt and sulfur co-doped TiO₂ nanostructures with enhanced photo-response properties for photocatalyst

Abstract

Cobalt (Co) and sulfur (S) co-doped titanium dioxide (TiO2) catalysts were synthesized via sol–gel method. The structure of TiO2was characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The valence states of elements were studied by X-ray photoelectron spectroscopy (XPS), and the optical-absorption properties of the catalysts were tested using the ultraviolet–visible (UV–Vis) spectrophotometer. The results showed that the grain sizes of Co and S co-doped TiO2 decreased with the increase of Co and S doping concentration within a certain range, and then the catalysts had obvious red shift on the absorption of visible light. Sample (2%Co–5%S–TiO2) showed excellent light absorption characteristics and the photo-response threshold increased significantly to about 760[Formula: see text]nm. Also, the further degradation test under visible light shows the 2%Co–5%S-TiO2 sample exhibit apparently improved degradation efficiency for Rhodamine B compared to the undoped one.

Enhancing the physical properties and photocatalytic activity of TiO2 nanoparticles via cobalt doping

“…The introduction of new d-states close to the valence band edge may also be another reason for the reduced band gap. 14,34…”

Modified Titanium Dioxide for Photocatalytic Applications

“…Although single metal doped and non-metal doped TiO 2 have exhibited excellent performance in decreasing the electrons and holes recombination, but they suffer from thermal stability and losing a number of dopants during catalyst preparation process [77]. Therefore, co-doping of two kinds of atoms into TiO 2 has recently attracted much interest [78]. The electronic structure of TiO 2 can be altered by co-doping on TiO 2 by formation of new doping levels inside its band gap.…”

Titanium and iron-modified delaminated muscovite as photocatalyst for enhanced degradation of Tetrabromobisphenol A by visible light

“…Titanium dioxide (TiO 2 ) photocatalysts are widely investigated for the degradation of organic pollutants, as they are readily available, photoactive, biologically and chemically inert, and relatively inexpensive. [1][2][3][4][5][6][7] Recently, TiO 2 clays generated significant interest; [8][9][10] therefore, these materials have been applied as photocatalysts for effective treatment of waste water containing toxic organic compounds. Some attempts have been made to develop heterogeneous catalysts prepared by loading iron oxide (III) on porous media such as clay, activated carbon and graphite using more or less ** corresponding author.…”