Effect of Surface Site Defects on Photocatalytic Properties of BiVO₄/TiO₂ Heterojunction for Enhanced Methylene Blue Degradation

Table 1

Structural parameters of pure TiO₂, pure BiVO₄, and BiVO₄/TiO₂ nanocomposites determined from XRD data.

Catalysts	XRD crystallite size (nm)	a (Å)	b (Å)	c (Å)	Unit cell volume (Å^3)
TiO2	54	3.78	3.78	9.51	135.88
2 wt% BiVO4/TiO2	18	3.78	3.78	9.50	135.93
5 wt% BiVO4/TiO2	22	3.78	3.78	9.51	136.27
10 wt% BiVO4/TiO2	31	3.78	3.78	9.53	136.93
BiVO4	45	5.17	5.10	11.67	308.55