Study on photocatalysis and dynamics properties of self-catalysis BiVO4 assembled in porous Sr2MgSi2O7:Eu2+,Dy3+

Recent advances and prospects of persistent luminescent materials as inner secondary self-luminous light source for photocatalytic applications

“…With these considerations, a MPL with stronger PL and persistent intensity as well as longer persistent duration is more desirable for providing the photons to the PCM when there is no external excitation source. In addition, the persistent spectral region should lie in a spectral region where the PCMs also lie in, for instance, those MPLs (Tables 1-6) with the spectral regions that can match with the absorption range of the PCMs (e.g., Ag-AgCl [63], g-C3N4 [65], BiVO4 [72], and Ag3PO4 PCMs [64,376], whose optical bandgap fall in the range of 2.5~3.0 eV). So far, the Moreover, another working principle of the MPLs we need to consider is the physicochemical stability, typically in presence of moisture.…”

“…Conversely, the MPLs featuring broad band and long persistent duration, especially for those showing a spectral contribution extending to the UV spectral range, are privileged. For example, the melilite-type Ce 3+ -doped Ca2MgSi2O7 whose persistent band peaks at 380 nm is suitable for a TiO2 PCM that presents an absorption cut-off at 387 nm, whereas other types of PMLs like CaAl2O4:Eu 2+ ,Nd 3+ with emission peaking at ~440 nm [49,[60][61]71], SrAl2O4:Eu 2+ ,Dy 3+ with ~520 nm emission [64,379], and Sr2MgSi2O7:Eu 2+ ,Dy 3+ with ~465 nm emission [66,72] are unsuitable. With this logical thinking, the TiO2 is usefully associated with MPLs, as proved by the Sr4Al14O25:Eu 2+ ,Dy 3+ ,Bi 3+ @TiO2 for the MB degradation [69], BaAl2O4:Eu 2+ ,Nd 3+ @TiO2 for the benzene decomposition, Ca2MgSi2O7:Ce@TiO2 [366] and Mg3Y2Ge3O12:Bi@TiO2 [380] for the MO degradation, etc.…”

“…The MPL@PCM composite structure typically consists of fine particles of the PCMs attached onto the MPL with a coating process that depends strongly on the specific type of the PCMs, the synthesis strategies, and the post-or after-treatment routes. For instance, BiVO4 and g-C3N4 can be in-situ grown onto the surface of the Sr2MgSi2O7:Eu 2+ ,Dy 3+ by using hydrothermal [72] and sintering methods [379], respectively; while nano-TiO2 particles are preferably deposited onto the surface of CaAl2O4:Eu 2+ ,Nd 3+ [61,71] or Ca2MgSi2O7:Ce 2+ [366] particles rather than grown.…”

“…Unlike the solid-state & combustion reaction routes, the hydrothermal and sol-gel methods are popular for the synthesis of MPL@PCM nanocomposites with regular particle size and smooth particle surface, as proved by the Sr2MgSi2O7:Eu 2+ ,Dy 3+ [66], CaAl2O4:(Eu,Nd)@Fe2O3-SrTiO3 [70], and Sr2MgSi2O7:Eu 2+ ,Dy 3+ @BiVO4 [72]. Although they sometimes can make the composites featuring irregular micro-size particles and rough surfaces (e.g., Ca2Al2SiO7:Ce 3+ @Ag-AgCl [63], Sr4Al14O25:(Eu,Dy)@g-C3N4 [65], MgAl2O4:(Pr 3+ ,Dy 3+ )@Cr-TiO2 [107], and GP@Fe-N-TiO2 [384], Figures 17a-d), the particle size and surface morphology of the MPLs after being loaded or coated with the PCMs do not change significantly.…”

“…PCMs that meet the above conditions include, such as, aluminates like MAl2O4:Eu 2+ ,Dy 3+ /Nd 3+ (M: alkaline)[60-62, 64, 67, 70-71], and silicates like M2MgSi2O7:Eu 2+ ,Dy 3+[66,72,[376][377][378][379].…”