Effect of calcination temperature on the microstructure, crystallinity and photocatalytic activity of TiO2 hollow spheres

Enhancement of photocatalytic activity for BiPO4via phase junction

“…The particles of BiPO 4 melted and became larger with increasing calcination temperature above 550 C. 25 High temperature calcination could also destroy the particles of other materials. For example, TiO 2 hollow spheres agglomerated into larger particles above 800 C. 33 The morphology of FeTiO 3 changed from nanobers to submicron particles with increasing in the calcination temperature in the range of 600-1000 C. 34 3.2 Enhancement of the photocatalytic activity via phase junction of BiPO 4…”

One-step and large-scale synthesis of anatase TiO2 mesocrystals along [001] orientation with enhanced photocatalytic performance

“…Mesocrystals can simultaneously attain high crystallinity and large specific surface area, 10 which are considered the two key factors for the enhancement of photocatalytic activity. 19,20 Some approaches for the synthesis of TiO 2 mesocrystals have been reported. Jiao et al 21 reported the synthesis of hollow anatase TiO 2 mesocrystals with dominant (101) facets by a new route with PO 4 3− /F − as a morphologycontrolling agent and investigated the photocatalysis reaction preference toward O 2 and H 2 evolution from water splitting.…”

Molten-Salt Flux Mediated Synthesis of ZnO-SnO2 Composites: Effects of Surface Areas and Crystallinities on Photocatalytic Activity

“…increases, the surface area of the composites decreases ( Figure 2), which leads to decreased photocatalytic activity due to fewer sites to adsorb the dye molecules. By contrast, as the synthetic temperature increases, the crystallinity increases ( Figure 2), which leads to increased photocatalytic activity due to smaller concentration of defects in the sample and thus higher mobility of the excited carriers (excited electrons and/or holes) 57,58 , as has also been shown in literature for other photocatalysts [59][60][61][62][63] . For the ZnO-SnO2 composite synthesized at 400 °C, although it has the highest specific surface area to adsorb the dye, it is also amorphous and has a lower ZnO percentage likely due to the synthesis reaction being incomplete at such low temperature.…”