Research Article

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

Figure 5

3D response surface plots for % Cr(VI) removal; (a) as a function of N-F- concentration and Cr (VI)/BA ratio; (b) as a function of pH and N-F- concentration.
520123.fig.005a
(a)
520123.fig.005b
(b)