Abstract
Titanium-doped stainless steel nanotubes ([email protected]) were synthesized by electrochemical anodization and chemical reduction. Benzoic acid was subjected to degradation by photolysis, photocatalysis, photolytic oxidation, and photocatalytic oxidation using [email protected] under simulated solar irradiation in a laboratory-scale system. Photocatalytic oxidation employing [email protected] along with hydrogen peroxide (H2O2) as an oxidant exhibited the highest degradation rate (8.08 × 10−3 s-1). Pseudo-first-order rate constants were expressed as functions of initial benzoic acid concentration, irradiation intensity, and initial H2O2 concentration. An empirical kinetic model was developed based on the kinetic equations in respect of each factor, which resulted in good prediction of the photocatalytic oxidative degradation rates (R2 = 0.98). Compared to the other photocatalysts reported in the literature, this economical [email protected] showed competitive photocatalytic ability. The O2- and ∙OH played dominant roles for the degradation of benzoic acid in the photocatalysis and photocatalytic oxidation, respectively. [email protected] was stable during five repeated experiments, and it maintained its catalytic activity.
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