二氧化鈦廣泛運用於染料敏化太陽能電池及水體汙染物降解等環境及能源領域。本研究以鹼性環境下過氧化氫修飾二氧化鈦，並利用動態雷射光散射儀(DLS)、傅立葉轉換紅外線光譜(FTIR)、熱重分析儀 (TGA)、比表面基測定儀(BET)、高解析穿透式電子顯微鏡(HR-TEM)、X光粉末繞射(XRPD)分別對修飾過後的二氧化鈦進行表面分析；另外，利用電子順磁共振光譜儀(EPR) 觀測溶液中氫氧自由基。　
結果顯示在可見光染料敏化系統中，利用UVC前處理二氧化鈦增加表面的氫氧官能基，但沒有明顯增快降解反應速率。鹼性環境下過氧化氫修飾二氧化鈦，因為鹼侵蝕讓粒子粒徑變小(4 nm)，表面有較高密度的氫氧官能基(13.89 OH/nm2)，提高染料吸附量，產生較多光電子增加光催化效益；另外，在系統中加入不同的金屬離子(Fe3+、Cu2+、Zn2+以及Al3+)做測試，結果發現配合Fe3+離子錯合機制形成Fe(OH)2+，照光後電子轉移釋放出更多的氫氧自由基，降解反應速率比市售二氧化鈦(Degussa P25)的高出一個數量級。

TiO2 is widely used in the field of environment and energy, such as dye-sensitized solar cells and photocatalysts for the degradation of organic pollutants. This study is to enhance of the photodegradation of dye (Sulforhodamine B as a model compound) under visible light by TiO2 pretreated with alkaline hydrogen peroxide. Modified TiO2 nanoparticles were characterized by dynamic laser light scattering (DLS), fourier transform infrared (FT-IR), thermogravimetry analysis (TGA), surface area analysis (BET), high-resolution transmission electron microscopy (HRTEM) and X-ray powder diffraction (XRPD). In addition, electron paramagnetic resonance spectrometer (EPR) was utilized to observe the formation of hydroxyl radicals in the system.
TiO2 could not only increase the density of surface hydroxyl groups on the TiO2 surface (13.89 OH/nm2), but also lead to smaller particle size (4 nm). The dispersion and photocatalytic activity of the modified TiO2 were greatly enhanced. On the other hand, TiO2 pretreated with UVC light could increase the surface hydroxyl groups on the TiO2 surface though, the degradation rate was not unexpectedly enhanced.
The effect of metal ion (Fe3+, Cu2+, Zn2+ and Al3+) on the photocatalytic activity of the modified TiO2 was investigated under visible light. The results show that Fe3+ accelerated the photodegradation of dyes in aqueous modified TiO2 dispersions with one order of magnitude larger than commercial P-25. This may be ascribed to the complexation of the hydroxyl groups bound to TiO2 surface with Fe3+ to form Fe(OH)2+.

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