Effect of Bi/Ti ratio on (Na0.5Bi0.5)TiO3/Bi4Ti3O12 heterojunction formation and photocatalytic performance

Efficient piezocatalysis of Bi0.5(Na1−xKx)0.5TiO3 nanoparticles: bridging the phase ratio at MPB composition and piezocatalytic activity

“…UV-vis absorption analysis of the RhB solution was carried out in the wavelength range of 480 nm to 640 nm given that RhB absorbs optimally in the green light range at ∼554 nm. 27 As shown in Fig. 5a-c, with increasing degradation time, the intensity of the absorption peak around 554 nm greatly falls.…”

Efficient Cocatalyst-Free Piezo-Photocatalytic Hydrogen Evolution of Defective BaTiO3–x Nanoparticles from Seawater

“…Figure d visualizes the superiority of BTO-H in RhB degradation at the fixed time point of 30 min. There are many materials factors that may affect these data, including phase assemblage, impurities (viz., heterojunction formation), crystallinity, crystallite size, electronic band alignment, recombination time, BET surface area, [V O •• ], and blockage of active sites . Accordingly, the present work suggests that the catalytic performance (dye degradation) is associated with the following: The reduced E g and shift in E f , which are caused by increased defect concentrations (Ti 3+ , Ti 2+ , Ti 0 , V O •• ) and optimized by H 2 reduction, result in band alignment that establishes conditions favorable for dye degradation The shallow energy level established by the high E f and associated lowering of the CBM enhances charge carrier separation by promoting the diffusion of electrons to the surface, thereby reducing recombination with holes and facilitating higher carrier concentrations and efficient charge transfer across the grain surface. The increased BET surface area and associated [V O •• ] are optimized by H 2 reduction, thereby providing more active sites for catalytic reaction, although there may be mitigation by blockage of active sites by species dissolved in the water. The application of mechanical vibration leads to a displacement of charges (and possibly adsorbed species), thereby inducing the piezoelectric potential that facilitates surface reactions. The ultrasonic irradiation and resultant external stress induce the reduced band gap and band bending that shifts the conduction band closer to the HER band potential and the valence band further away from the OER band potential. It also is possible that multivalent Ti itself can act as an heterojunction structure to improve electron mobility and reduce charge transfer resistance, both of which are beneficial to the catalytic activity.…”

“…], and blockage of active sites. 48 Accordingly, the present work suggests that the catalytic performance (dye degradation) is associated with the following:…”

“…These dyes were selected for the catalytic degradation owing to differences in the wavelengths of maximal visible light absorption relative to that of RhB. That is, RhB absorbs maximally in the green range at 554 nm while MB absorbs most strongly in the red range at 664 nm and MO absorbs most strongly in the blue range at 464 nm . These data suggest that absorption may not be a serious limitation to the decomposition of a wide spectrum of organic contaminants of water purified by piezo-photocatalysis.…”

Construction of a 3D/2D Z-Scheme Heterojunction for Promoting Charge Separation and Augmented Photocatalytic Hydrogen Evolution

“…10,11 On the other hand, sodium bismuth titanate Na 0.5 Bi 0.5 TiO 3 (NBT) has a long recombination time for the photogenerated electrons and holes (∼10 0 ms) which promotes effective charge-carrier separation and enhances the photocatalytic activity. 14 Additionally, NBT also possesses interesting perovskite structure, high stability, and ferroelectric nature which makes it ideal for photocatalysis applications. Although the ferroelectric and piezoelectric properties of NBT have been widely explored, there are few reports available in literature regarding the application of sodium bismuth titanate in the field of photocatalysis.…”