Simultaneous Photocatalytic Reduction of Cr(VI) and Oxidation of Benzoic Acid in Aqueous N-F-Codoped TiO₂ Suspensions: Optimization and Modeling Using the Response Surface Methodology

Table 4

Photocatalytic kinetic parameters (rate constants, half-lives, correlation coefficients) of Cr(VI) and BA under optimized conditions ([N-F-TiO₂]₀ = 600 mg L⁻¹, Cr/BA ratio = 5, pH = 4).

	𝑘 (min^−1)	𝑡1/2 (min)	𝑅^2
Cr(VI)	0.0960	7.219	0.9929
BA	0.0109	63.578	0.9623