減少環境中多氯聯苯的排放是目前全球努力解決的問題,多氯聯苯在環境中不易被分解,需要在高溫的條件下才能將它去除。本研究希望透過光催化氧化程序來處理這項艱難的議題。因此,採用含浸法製備不同摻雜量的Cu/TiO2,並分析所製備樣品的物理化學特性包括場發射掃描式電子顯微鏡(FESEM)、能量逸散式光譜儀(EDS)、穿透式電子顯微鏡(TEM)、X-ray 射線繞射分析儀(XRD)、比表面積分析儀(BET)。通過在不同光源下(可見光、氙燈、自然日光)照射亞甲基藍的降解來評估Cu/TiO2的光催化效率。結果表明,在鍛燒溫度500℃、摻雜量為0.01M的Cu/TiO2在自然日光下照射亞甲基藍1小時降解效果可達92.10 %,這歸因於銅的複合提高了電子-電洞對的分離效率以及經由鍛燒後產生了銳鈦礦相與金紅石相的最佳比率,同時也具備良好的循環穩定性。最後,以此最佳條件對絕緣油中的多氯聯苯進行降解,4小時之降解率為58.71 %;毒性抑制率為74.81 %。
The reduction of polychlorinated biphenyls (PCBs) emissions to the environment is contemporary issues of global efforts. PCBs are not easily decomposed in the environment, and they need to be removed under high temperature conditions. This study hopes to deal with this difficult issue through a photocatalytic oxidation process. Therefore, different amounts of Cu/TiO2 were prepared by impregnation method, and were characterized by field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrometer (EDS), transmission electron microscope (TEM), X-ray diffraction and N2 adsorption–desorption isotherms. The photocatalytic efficiency of Cu/TiO2 was evaluated by the degradation of methylene blue under different light sources (visible light, xenon lamp, natural sunlight). The results showed that the degradation effect of Cu/TiO2 irradiated with methylene blue in natural sunlight for 1 hour at the calcination temperature of 500°C and the doping amount of 0.01M reached 92.10 %. It was attributed to the fact that the recombination of copper improved the separation efficiency of the electron-hole pair and the optimum ratio between the anatase phase and the rutile phase after calcination, as well as good reusable stability. Finally, PCBs in the transformer oil were degraded under the optimal conditions, the degradation rate was 58.71 % for 4 hours, and the toxicity inhibition rate was 74.81 %.