本實驗以水相的製程方法合成銳鈦相的二氧化鈦，並以TTIP作為前驅物，而合成出來的二氧化鈦在沒有摻雜任何的雜質元素下可以透過染料敏化的機制在LED可見光下進行光降解反應，並且透過SEM、DLS、XRD、FTIR、FL儀器分析來了解二氧化鈦奈米粒子的特性，而隨著硝酸量的改變，其光降解的效率也有所改變，降解速率最快的為0.5NT，能在20分鐘內能降解73%的羅丹明B。
為更進一步增強二氧化鈦的催化效果，本研究在合成過程中額外添加硝酸鐵形成鐵摻雜二氧化鈦，並以鐵摻雜二氧化鈦作為非均相的光芬頓觸媒。而隨著鐵的摻雜量的添加，鐵摻雜二氧化鈦的光降解效率會下降，但在添加4.4mM雙氧水後並利用光芬頓反應來進行光降解時，0.6Fe-0.5NT能在二十分鐘內降解80%的羅丹明B，而同樣在4.4mM雙氧水的環境下，改變鐵的摻雜量進行光芬頓反應的降解時，並不會影響降解的效率。

In this study, TiO2 is fabricated by the sol-gel method in DIW which can perform the photodegradation of RhB under the LED light before doping any element. By adding the ethanol as OH･ capture, we found that there is no OH radical produced during the photodegradation. So, we can confirm that the mechanism of the photodegradation is dye-sensitized degradation. SEM, DLS, XRD, FTIR, and FL were used to examine the property of TiO2. As the amount of nitric acid changes, the photodegradation rate will also change. 0.5NT is the best one for the photodegradation of RhB which can decompose 73% of RhB in 20 min. To further increase the ability of photodegradation, we dope the Fe3+ ion in TiO2 to introduce the Photo-Fenton reaction. Under the 4.4mM H2O2, 0.6Fe-0.5NT can decompose 80% RhB in 20min. The Photo-Fenton degradation rate still remains the same when we change the amount of Fe3+ ion under the 4.4mM H2O2.

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