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

Table 3

Apparent reaction rate constants and 𝑡_1/2 values for the degradation of MCP with 254 nm.

Photocatalyst	Apparent reaction rate constant k (× 10^−2 min^−1)	𝑡1/2 values (min)	Correlation coefficient (𝑅^2 value)
TiO2	6.0	11.55	0.985
0.3 wt% La-TiO2	8.0	8.66	0.976
0.5 wt% La-TiO2	9.5	7.29	0.981
0.7 wt% La-TiO2	12.0	5.76	0.990
1.0 wt% La-TiO2	14.0	4.95	0.982
1.5 wt% La-TiO2	11.0	6.3	0.989
Pure ZnO	5.25	13.20	0.976
1.0% La-ZnO	8.01	8.65	0.977

MCP = 40 mg L⁻¹, TiO₂ or La-TiO₂ = 100 mg/100 mL, pH = 5, UV = 8 lamps, λ = 254 nm, adsorption equilibrium time = 30 min, and irradiation time = 60 min.