本實驗以溶膠凝膠法製備TiO2光觸媒及改質後的Fe/TiO2光觸媒來處理二氯甲烷，發現經過393 K烘乾24小時後的光觸媒，隨著Fe：Ti比例的增加光催化活性有下降的趨勢，尤其是當Fe/Ti大於0.5 mol%之後，光催化的活性更是有明顯的下降。而比較723 K鍛燒4小時後的Fe/Ti＝0.005 mol%及TiO2光觸媒，Fe/Ti＝0.005 mol%光觸媒對於二氯甲烷有較佳的催化能力。而經由FTIR對光觸媒在鍛燒前後產物的分析，推測未鍛燒的光觸媒中，NO3-可能會參與光催化的反應使得FTIR的分析中有觀察到含氮的化合物，而在鍛燒後的光觸媒則沒有此一現象，此外經由Cl2分析儀的分析發現在無水氣的情況下，以光觸媒處理二氯甲烷會有氯氣產生。
　　由BET表面積及孔洞的分析，推測可能是因為硝酸鐵會填塞光觸媒的孔洞，使得表面積下降導致活性下降，經由XRD與TGA的分析發現，隨著Fe：Ti比例的增加anatase及rutile形成的溫度點也隨之降低，而Fe/Ti=5 mol%光觸媒在經過高溫鍛燒可能會有Fe2TiO5的晶相產生；經由393 K 烘乾24小時後的光觸媒之UV-Visible的分析發現Fe/TiO2光觸媒於可見光部分的吸光是由硝酸鐵所造成並沒有光催化的功能，而經過723 K鍛燒4小時之後的Fe/TiO2光觸媒，發現其UV-Visible的吸收光譜有往長波偏移的現象。

　　In this study, we decompose the dichloromethane over The TiO2 and modified-Fe/TiO2 photocatalysts prepared by the sol-gel methods. We found that the photoactivity of the photocatalysts dried at 393 K for 24 hrs decrease with the ratio of Fe/Ti. The efficiency of the photocatalyst dropped significantly while the ratio of Fe/Ti was over 0.5 mol %. After calcining at 723 K for 4 hrs, the photocatalyst Fe/Ti=0.0005 mol% showed the higher photoactivity for the dichloromethane decomposition than that of TiO2.
　　The nitrogen-containedompound was detected through a FTIR in the case of the uncalcined photocatalyst. On the basis of this result, it was thought that the NO3- may act as the media to partake the photocatalytic reaction. No nitrogen-contained compounds were detected for the calcined photocatalyst in the FTIR patterns. Additionally, a significant amount of Cl2 gas was analyzed by a Cl2-analyzer during the photocatalytic experiment while no water was fed into the influent gases.
　　From the BET analysis, the surface area of the uncalcined photocatalyst decreased significantly. This may be due to that FeNO3•9H2O occupied the pores in the photocatalyst and cause low conversion. The formation temperatures of the anatase and rutile decreased with the ratio of Fe/Ti through the XRD and TGA analysis.
　　For the Fe/Ti=5 mol% photocatalysts, Fe2TiO5 may form at a high calcining temperature. After 24 hrs dried at 393K, the UV-Visible analysis indicated that the distinct absorption region was within the visible-wavelength and was attributed to FeNO3•9H2O, which is low/no photoactivity. However, after 4 hrs calcined at 723 K, the Fe/TiO2 photocatalysts resulted in a definite shift in the absorption spectra toward visible light regions.
　　In this study, we found the photoactivity decreased at high calcining temperatures and the presence of water resulted in decreasing conversion.

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