Sol-solvothermal preparation and characterization of (Yb, N)-codoped anatase–TiO2 nano-photocatalyst with high visible light activity

The synthesis and characterization of ytterbium-doped TiO2 hollow spheres with enhanced visible-light photocatalytic activity

“…The reason for this was attributed to the formation of an empty 4f impurity energy level in the rare earth ions between the conduction and valence bands in the TiO 2 energy band structure. 44,46,47 However, the luminescence intensity of 1.5%Yb-TiO 2 HS was stronger than that of 1%Yb-TiO 2 HS, which shows that an excessive Yb 3+ in TiO 2 will form a new center for the recombination of the e À and h + .…”

“…The rst reason is the band gap narrowing, in which Yb doping leads to the appearance of oxygen vacancy defects. 44 In addition, a small amount of residual carbon atom doping in TiO 2 replaced the oxygen state in the TiO 2 HS lattice via the calcination of MF at 500 C, which also leads to a narrowing of the band gap. 45 The second reason is the separation of electron-hole pairs; the luminescence spectra ( Fig.…”

Synthesis of CdS Sensitized TiO2Photocatalysts: Methylene Blue Adsorption and Enhanced Photocatalytic Activities

“…From this graph, it is evident that about 3 times more MB is removed by photocatalysis process than by adsorption (darkened section of the graph). According to earlier experimental results [47,48], the photocatalytic degradation of MB obeys the heterogeneous pseudo-first-order Langmuir-Hinshelwood (LH) model given as…”

The sol–gel approach as a method of synthesis of xMgO·ySiO2 powder with defined physicochemical properties including crystalline structure

“…Synthetic powders are products of reaction carried out between precursors of different metals. However, hydrated mixed oxides can be obtained in hydro-or solvothermal conditions [13][14][15].…”