Synthesis and structural characterization of novel visible photocatalyst Bi–TiO2/SBA-15 and its photocatalytic performance

Abstract

Bi-doped TiO 2 /SBA-15 (Bi-TiO 2 /SBA-15) was synthesized by a wet impregnation method. It was found that SBA-15 retained its ordered hexagonal mesostructure after incorporation of TiO 2 and Bi. TiO 2 nanoparticles and Bi species dispersed well and anchored both in the channel and the wall of SBA-15. The photocatalytic activity was evaluated on photodegradation of Rhodamine B (RhB) under visible light irradiation (l ¢ 420 nm). Experimental results indicated that Bi-TiO 2 /SBA-15 exhibited higher photocatalytic activities than pure TiO 2 and TiO 2 /SBA-15 owing to the synergetic effects of Bi species and TiO 2 . The degradation of RhB by these catalysts follows the pseudo-firstorder kinetic model and Bi-TiO 2 /SBA-15 (2.0%) was found to be the best. The effect of Bi doping on the photocatalytic activity was investigated by the density functional theory (DFT) method. The calculated results indicated that Bi doping could improve the photocatalytic activity by extending the spectral response from UV to the visible region, making the Bi-TiO 2 /SBA-15 active under visible light irradiation.

Enhancing the Photocatalytic Activity of Sr4Al14O25: Eu2+, Dy3+ Persistent Phosphors by Codoping with Bi3+ Ions

“…These Bi‐induced traps act as better trapping centers for electrons due to their higher charge decompensation. The overall result is an increment of recombination of holes and electrons . When the bismuth is introduced as a dopant, the photocatalytic activity increases because its presence generates additional traps as explained before in the optical analysis.…”

Photocatalysis by morphologically tailored mesoporous silica (SBA-15) embedded with SnO 2 nanoparticles: Experiments and model

“…In other words, adsorptiondesorption equilibrium is reached instantaneously. From literature [23], we find that complete adsorption is achieved at a much smaller time scale than reaction. For example, discussion following fig.…”

Effect of Different Calcination Temperatures on the Structural and Photocatalytic Performance of Bi-TiO2/SBA-15

“…TiO 2 /SBA-15 material was first prepared by internal hydrolysis method with little modification [23]. In this case, the calculated amount of tetrabutyl titanate (TBT) was dissolved in ethanol in a volume ratio of 1 : 5 (the amount of TBT is 0.92 mL).…”