Neodymium-Doped TiO_𝟐 with Anatase and Brookite Two Phases: Mechanism for Photocatalytic Activity Enhancement under Visible Light and the Role of Electron

Table 1

Summary of the physicochemical properties of TiO₂ and Nd-doped TiO₂ composites.

Sample	Average size crystalline size (nm)^a	Phase content^b (%)		BET surface area    (m^2·g^−1)	Pore size (nm)^c	Total volume pore   (cm^3·g^−1)	Bandgap (eV)
		Anatase	Brookite
Pure TiO2	20.32	13.97	86.02	72.46	3.54	0.172	3.11
Nd-doped TiO2; (Ti : Nd = 23 : 1)	20.32	9.500	90.49	67.18	2.40	0.0830	2.57
Nd-doped TiO2; (Ti : Nd = 11 : 1)	20.35	7.660	92.35	59.54	2.76	0.0831	2.33

^aDetermined by XRD using Scherrer equation based on (121) peak.
^bCalculated using the formula in [24].
^cCalculated from 𝑆_BET.