本研究中使用熱水合成法合成出三種不同形狀的赤鐵礦奈米礦物，分別為奈米粒子、奈米棒及奈米管，再藉由碳熱還原法將奈米赤鐵礦還原成奈米磁鐵礦；探討不同晶貌的奈米赤鐵礦及奈米磁鐵礦彼此間光催化效應之差異，並嘗試解釋各自之光催化機制與評估最有效益的種類/型態。
　　由XRD的圖譜及TEM的結果可以得知我們確實成功地合成出赤鐵礦奈米粒子、奈米棒與奈米管，也成功地將上述樣品還原成奈米磁鐵礦，並且維持其晶貌；BET的結果顯示：粒徑較小的擁有較高的比表面積，而管狀的比表面積又比棒狀晶貌來的高；SQUID的結果顯示：奈米赤鐵礦系列為弱鐵磁性；由UV-VIS的結果可以得知其能隙落在1.9~2.2 eV，屬於可見光的範圍，因此可用於可見光波段的光催化反應；奈米赤鐵礦及奈米磁鐵礦的光催化速率為：奈米粒子>奈米管>奈米棒，即隨著能隙的加大和比表面積的增加其相對應的光催化速率變快，說明了光催化效率與晶貌的改變是有關聯性的。本實驗合成得到的氧化鐵奈米礦物之光催化效果與前人結果互相比較，證明氧化鐵奈米礦物是有潛力應用於環境污染整治上。

　　In this study, three crystal morphologies of hematites (nano-particle, nano-rod, and nano-tube) are synthesized by a hydrothermal method. After that, the magnetites with different morphologies are prepared using carbon reduction method. The photocatalytic activity and mechanism of these nano-hematites and nano-magnetites are discussed. The photocatalytic efficiency of nano-hematites and nano-magnetites with various crystal morphologies are also evaluated.
　　From the XRD and TEM results, we can successfully prepare nano-hematite and nano-magnetites with morphologies of particle, rod, and tube. The BET results indicate that the specific surface area is followed the order: nano-particle > nano-tube > nano-rod. All the three crystal shapes of nano-hematites show a weak ferro-magnetism by the SQUID measurement. The band gap of nano-hematites is within the range of 1.9 eV~2.1 eV, which is in the visible-light wavelength and can be used as photocatalysts under visible- light irridiation.
　　The photocatalytic activity of nano-hematites and nano-magnetites is: nano-particle > nano-tube > nano-rod, which increases with the increasing specific surface area and band gap. The present results suggest that the photocatalytic efficiency is affected by the crystal morphology. In addition, the photocatalytic ability of these nano-hematites is comparable with that listed in the literatures. This indicates that the nano-hematite is a potential candidate in the application of the environmental treatment.

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