Simultaneous Photocatalytic Reduction of Cr(VI) and Oxidation of Benzoic Acid in Aqueous N-F-Codoped TiO<sub><b>2</b></sub> Suspensions: Optimization and Modeling Using the Response Surface Methodology

<table>Kinetics of reduction of Cr(VI) and degradation of BA versus irradiation time under optimized conditions ([N-F TiO<sub>2</sub>]<sub>0</sub>  =  600 mg <svg height="15.8375" id="M159" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 22.5875 15.8375" width="22.5875" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,0,0,-.017,.062,15.775)"><path d="M495 163l30 -6q-19 -99 -36 -157h-453v28q63 5 77.5 20t14.5 78v400q0 63 -13 77t-75 19v28h261v-28q-61 -5 -74.5 -19t-13.5 -77v-395q0 -41 5 -59t18 -25q24 -13 96 -13q85 0 112 31q30 33 51 98z" id="x4C"></path></g>
<g transform="matrix(.012,0,0,-.012,9.213,7.613)"><path d="M535 230h-483v50h483v-50z" id="x2212"></path></g><g transform="matrix(.012,0,0,-.012,16.197,7.613)"><path d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" id="x31"></path></g>
</svg>,  Cr(VI)/BA ratio = 5, pH = 4). </table>

International Journal of Photoenergy

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Figure 9

Figure 9: Simultaneous Photocatalytic Reduction of Cr(VI) and Oxidation of Benzoic Acid in Aqueous N-F-Codoped TiO<sub><b>2</b></sub> Suspensions: Optimization and Modeling Using the Response Surface Methodology 

Figure 9 | 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 