Shape evolution of Eu-doped Bi 2 WO 6 and their photocatalytic properties

Combustion Synthesis and Enhancement of BiOCl by Doping Eu3+ for Photodegradation of Organic Dye

“…(b), obvious shift in the XRD peaks for Eu‐doped BiOCl photocatalysts is observed, due to the smaller radius of Eu 3+ ion (0.947 Å) than that of Bi 3+ ion (1.03 Å) . This implies that Eu 3+ ions were incorporated into the BiOCl lattice, and Bi 1− x Eu x OCl solid solutions were successfully synthesized by the combustion method …”

“…However, in the case of x = 0.5, the photocatalytic activity significantly decreases. This phenomenon generally happens on metal ion doped semiconductor photocatalyst . Excess doping of Eu 3+ ions above its optimum level may act as recombination centers for photogenerated e − –h + pairs, which results in the deterioration of photodegradation performance .…”

“…The rare earth metal‐doped semiconductors show excellent light responding properties either by directly utilizing the excited electron in rare earth metal ion when the easy transfer of the electrons from metal ion to the conduction band (CB) of semiconductor occurs, or by indirectly utilizing the emitted short wavelength light by the absorption of semiconductors . A number of reports have proved that the rare earth metal‐doped semiconductors showed significantly improved photocatalytic performances, such as TiO 2 and ZnO, Bi 2 O 3 , Bi 2 WO 6 , BiVO 4 , Bi 2 MoO 4 . Recently, Saraf's group has prepared layered Bi 1− x Eu x OCl compounds and a series of Bi 1− x Eu x OX (X = F and Br) by conventional solid‐state method and these samples showed efficient photocatalytic activities for the degradation of RhB.…”

Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

“…Moreover, these oxygen vacancies favor the adsorption of oxygen on the semiconductor surface, thus facilitating the dioxygen reduction to form superoxide radicals [119]. Xu et al reported that evolution of nanoflake-like morphology by Eu doping was found to be the main factor for high activity, rather than change in the bandgap absorption properties [218]. Among the rare earth ions (La, Ce, Pr, Nd, Sm, Eu, Gd), the dopants like La, Gd and Eu was found to promote the photoactivity, while Pr doping exhibited least performance [218][219][220].…”

Sol–gel synthesis and enhanced photocatalytic activity of doped bismuth tungsten oxide composite

“…Many transition-metal ions were showed individual doping effect in the photocatalytic activities of Bi 2 WO 6 [33][34][35][36][37][38][39]. Additionally, the effect of foreign metal cations on the shape evolution of metal oxides had also attracted attention [40]. Mismatched doping usually results in the formation of impurity phase, which can help us understand the substitution pattern in the lattice.…”