[Retracted] Highly Active Rare-Earth-Metal La-Doped Photocatalysts: Fabrication, Characterization, and Their Photocatalytic Activity

Table 4

Apparent reaction rate constants and 𝑡_1/2 values for the degradation of MCP with 365 nm.

Photocatalyst	Apparent reaction rate constant k (× 10^−2min^−1)	𝑡1/2 values (min)	Correlation coefficient; (𝑅^2 value)
TiO2	5.3	13.08	0.999
0.3 wt% La-TiO2	5.8	11.95	0.995
0.5 wt% La-TiO2	6.7	10.34	0.993
0.7 wt% La-TiO2	8.2	8.45	0.994
1.0 wt% La-TiO2	9.0	7.7	0.985
1.5 wt% La-TiO2	8.6	8.06	0.989
Pure ZnO	3.00	13.20	0.999
1.0% La-ZnO	8.00	8.66	0.985

MCP = 40 mg L⁻¹, TiO₂ or La-TiO₂ = 100 mg/100 mL, pH = 5, UV = 8 lamps, λ = 365 nm, adsorption equilibrium time = 30 min, and irradiation time = 60 min.