Synthesis, optical properties, and photocatalytic activity of lanthanide-doped anatase

Optical and Photocatalytic Properties of Carbon-Activated Anatase with Spherical Shape of Aggregates

“…Earlier it was shown that the morphology and sizes of crystals of titanium glycolate used as a precursor of pure and doped anatase depend essentially on the conditions of their formation [32][33][34][35][36][37][38][39][40]. An important feature of Ti(OCH 2 CH 2 ) 2 as a precursor is the ability of its crystals to undergo a pseudomorphic transformation into thermolysis product aggregates during heating in air and in inert gaseous medium.…”

“…One of the main aims of this work was to produce the solid solutions TiO 2-x C x and composites TiO 2-x C x :nC with spherical shape of aggregates and to examine their optical and photocatalytic properties by means of modern experimental and theoretical methods. The samples were synthesized by the developed precursor technique from titanium glycolate Ti(OCH 2 CH 2 O) 2 used as a precursor taking into consideration the familiar ability of the crystals of this compound to undergo a pseudomorphic transformation into aggregates TiO 2-x C x :nC and TiO 2 during heating [32][33][34][35][36][37][38][39][40].…”

Synthesis, spectral, optical and photocatalytic properties of vanadium- and carbon-doped titanium dioxide with three-dimensional architecture of aggregates

“…The samples were synthesized by the precursor method with the use of glycolate of the composition Ti 1-x V x (OCH 2 CH 2 O) 2 (0≤x≤0.05) as a precursor taking into account that the crystals of this compound are able to undergo a pseudomorphous transformation into aggregates Ti 1-x V x O 2 , Ti 1-x V x O 2-y C y and Ti 1-x V x O 2-y C y :nC during heating under pre-assigned conditions [25][26][42][43][44][45]. To produce a precursor with spherical shape of crystal aggregates, we have developed a technique allowing for the following reactions: 2 have a pale yellow color, which intensifies with the growth of the concentration of vanadium.…”

“…The appearance of impurity ions in the interstices stabilizes the anatase structure and, consequently, increases the phase transition temperature[54]. The examples confirming these points can be the activating effect of iron (III) ions[43] and the inhibiting effect of europium (III) ions[45] on the anatase-rutile phase transition. The stabilizing role of carbon consists apparently in screening of the anatase lattice fragments preventing their diffusion and rearrangement into rutile lattice.…”

“…For example, using titanium glycolate Ti(OCH 2 CH 2 O) 2 and solid solutions based thereon of the general composition Ti 1-x M x (OCH 2 CH 2 O) 2 as precursors, it is possible to synthesize both pure and transition-element and carbon-doped titanium dioxide in the form of nanodispersed solid solutions TiO 2-y C y , Ti 1-x M x O 2 , Ti 1-x M x O 2-y C y and nanocomposites TiO 2-y C y :nC, Ti 1-x M x O 2-y C y :nC with pre-assigned concentration of impurity elements and controlled dimensional and morphological characteristics of particles [25][26][40][41][42][43][44][45][46]. In most cases, the morphology and dimensions of precursor crystals depend on the method of their production.…”