The effect of lanthanide on the degradation of RB in nanocrystalline Ln/TiO2 aqueous solution

Exploring the critical dependence of adsorption of various dyes on the degradation rate using Ln3+-TiO2 surface under UV/solar light

“…The crystallite sizes of Ln 3+ -TiO 2 were smaller compared to undoped titania indicating that the inclusion of Ln 3+ at Ti 4+ lattice sites of TiO 2 significantly suppressed the grain growth of anatase phase by providing dissimilar boundaries. This reduction in crystallite size is due to the segregation of the dopant cations at the grain boundary, which inhibits the grain growth by restricting the direct contact of grains [32]. The doping of Ln 3+ improves the pore stability and also results in poor titania-titania connectivity necessary for the phase transformation to rutile.…”

Photoinduced hydroxyl radical and photocatalytic activity of samarium-doped TiO2 nanocrystalline

“…The adsorption capacity can be generally improved by increasing the specific surface area of catalysts. On the other hand, in order to eliminate the recombination rate of the electron-hole pairs, several approaches have been proposed, including transition metals doping [3,4], coupling with other semiconductors [5,6], noble metals deposition [7] and rare earth ions doping [8][9][10][11]. Especially, the photocatalytic activity of * Corresponding author.…”

“…Thus, doping with lanthanide ions could provide a means to concentrate on the organic pollutant at the semiconductor TiO 2 surface and therefore enhance the photoactivity of titania [15,16]. On the other hand, doping with lanthanide ions with 4f electron configurations also could significantly improve the separation rate of photo-induced charge carriers in TiO 2 photocatalysts and greatly enhance the photocatalytic activity of TiO 2 [8][9][10][11]. Wang and his co-workers reported that the separation of electron-hole pairs was more efficient in the lanthanide ion-doped TiO 2 including La 3+ , Nd 3+ , Pr 3+ , Sm 3+ , and Eu 3+ than that in pure TiO 2 [17,18].…”

Photocatalysis enhancement of CaAl2O4:Eu2+, Nd3+@TiO2 composite powders

“…Unfortunately, the photocatalytic degradation efficiency on the surface of TiO 2 particles is still low, which is due to the fast recombination rate of photogenerated electron-hole pairs and the finity of the light source. In order to slow down the electron-hole pairs and enhance interfacial charge-transfer efficiency, several approaches have been proposed, including transition metals doping [3,4], coupled semiconductor systems [5,6], noble metals deposition [7], and rare earth ions doping [8][9][10][11]. However, not enough attention has been paid to the dependence on light which is also important.…”