本研究利用紫外光發光二極體為光源，藉由光觸媒催化提升水溶液中溴酸鹽的還原，探討各項實驗操作之變因(如：溫度、水溶液pH值、初始濃度、氮化碳添加量、自由基抑制劑、共存離子、重複性測試、光強度、照光週期、)對溴酸鹽的還原速率之影響。並透過BET、XRD、SEM、UV-vis DRS、界達電位和光致發光，進行光觸媒的物化特性之分析。
研究結果表明，在酸性條件下，溴酸鹽的還原速率顯著增加。此外，在低光強度下，還原反應速率隨著光強度的提升而顯著提高，但在高光強度下反應速率的提升則會趨於平緩。由間歇照光實驗發現，在相同照明時間下，可以藉由改變佔空比的光暗期來分別達到提高還原效率或光子利用率的結果。發現在間歇照光下進行的還原實驗，其能源使用有明顯的減少，並達到節能的效果。
觀察到吸附在二氧化鈦表面上的溴酸鹽幾乎被光還原為溴離子。此外，在連續照光以及間歇照光下操作之光觸媒還原溴酸鹽之行為符合Langmuir-Hinshewood動力模式。

The photocatalytic reduction of BrO3- in aqueous solution was carried out under the UV-LED light source, the effects of various experimental operation variables on the reduction rate of bromate such as: light intensity, pH value of aqueous solution, initial concentration, periodic illumination, temperature, carbon nitride addition, radical inhibitor, co-existing ions, and recyclability test were also discussed. The characterizations of photocatalyst were analyzed by X-ray diffraction (XRD), Brunauer- Emmett-Teller surface area measurement (BET), field emission scanning electron microscope (FESEM), Fluorescence spectrophotometer (PL), zeta potential and UV-vis diffuse reflectance spectra (UV-vis DRS). The results showed that the reduction rate of BrO3- was significantly increased under acidic conditions. In addition, at low light intensity, the reduction reaction rate increased significantly with the increase of light intensity, but the increase of the reaction rate tended to be flat at high light intensity. From the periodic illumination experiments, it is found that under the same illumination time, the reduction efficiency or photonic efficiency can be improved by changing the light or dark period of the duty cycle, respectively. The reduction experiment carried out under periodic illumination can significantly reduce the energy usage and achieve the electric energy saving.
It was observed that the BrO3- adsorbed on the TiO2 surface was almost photo reduced to Br-. In addition, the behavior of photocatalysts operating under continuous illumination as well as periodic illumination for BrO3- reduction conforms to the Langmuir-Hinshewood kinetic model.

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