| Summary: | 碩士 === 臺北市立大學 === 地球環境暨生物資源學系環境教育與資源碩士班 === 104 === In this study, silver and platinum have been applied to modify the titanium nanotubes thin films through photo deposition. The technique of using the photocatalytic degradation property from titanium nanotubes to remove the APAP and SMX in the aqueous solution has been demonstrated effective. It could be observed from the experimental coupons that neither significant decay was achieved under the visible light, nor did the dark adsorption reactions occur; instead, it was essential to apply UV light in order to catalyze the reaction. In the experiment of using silver-doped coupons under UV light, the photocatalytic degradation technique to remove APAP and SMX in the aqueous solutions was proved to be most efficient with 34% and 100% respectively. The results have shown that the degradation efficiency of target pollutants sequences as the following: TiO2 + Ag> TiO2 + Pt> TiO2> UV only.
In addition, from the experiment in which the initial pH value has been varied, it was verified that the doping of different metals and solutions and the changed initial pH value would all affect the effects of photocatalytic degradation for removing APAP and SMX. Under the experimental conditions, when the pH of the solution was 5.0, it was most conducive for the photocatalytic degradation to take place and remove APAP and SMX. The removal efficiency of APAP could then increase to 88.3%. Even though changing the pH value has no effect on the sequence of degradation efficiency of various coupons, it can accelerate the degradation efficiencies and shorten the reaction time.
Keywords: Emerging contaminants, titanium dioxide thin films, photocatalytic degradation, acetaminophen, sulfamethoxazole
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