Visible light-induced photocatalytic degradation of tetrabromobisphenol A on platinized tungsten oxide

초록

In this study, we investigated the degradation of the flame retardant tetrabromobisphenol A (TBBPA) using platinized tungsten oxide (Pt/WO<inf>3</inf>), synthesized via a simple photodeposition method, under visible light. The results of degradation experiments show a significant enhancement in TBBPA degradation upon surface platinization of WO<inf>3</inf>, with the degradation rate increasing by 13.4 times compared to bare WO<inf>3</inf>. The presence of Pt on the WO<inf>3</inf> surface stores conduction band electrons, which facilitates the two-electron reduction of oxygen and enhances the production of valence band holes (h<inf>VB</inf>+) and hydroxyl radicals (●OH). Both h<inf>VB</inf>+ and ●OH are significantly involved in the degradation of TBBPA in the visible light-irradiated Pt/WO<inf>3</inf> system. This was verified through fluorescence spectroscopy employing coumarin as a chemical probe and oxidizing species-quenching experiments. The analysis of degradation products and their toxicity assessment demonstrate that the toxicity of TBBPA-contaminated water is significantly reduced after Pt/WO<inf>3</inf> photocatalysis. The degradation rate of TBBPA increased with increasing Pt/WO<inf>3</inf> dosage, reached an optimum at a Pt content of 0.5 wt%, but decreased with increasing TBBPA concentration. The decrease in degradation efficiency of Pt/WO<inf>3</inf> was minor, both in the presence of various anions and after repeated use. This study proposes that Pt/WO<inf>3</inf> is a viable photocatalyst for the degradation of TBBPA in water under visible light. © 2024 Elsevier Ltd

키워드