奈米碳管是一種由石墨層捲曲形成直徑為奈米級的中空管柱體，相較於其他碳材，奈米碳管具有獨特之特性，如: 質量輕、高強度、高韌性、高表面積、高熱傳導性等。化學氣相沉積法是製備單層奈米碳管最有效率的方法。而利用陽極氧化鋁模板輔助化學氣相沉積法法合成奈米碳管，其製備出之奈米碳管呈現準直且排列規則之特性，可使用簡單的程序對奈米碳管進行改質，如直接氟化、硝酸處理或填充磁性及螢光奈米顆粒等，藉此提升奈米碳管之功能性。本研究先以磁流體填充在陽極氧化鋁孔道內，再利用填充磁流體之陽極氧化鋁輔助化學氣相沉積法，使奈米碳管之碳層包覆住磁性顆粒，一步驟合成奈米碳管，透過此方式，即可合成出具備磁性之磁性奈米碳管。對於本研究所使用之陽極氧化鋁以及製備的磁性奈米碳管結構分析，使用電子顯微鏡進行觀察透過X射線繞射分析儀及拉曼光譜進行分析磁性奈米碳管之結晶相，此外，使用超導量子干涉儀進行飽和磁化度之鑑定。最後將磁性奈米碳管應用於污染物之吸附，並以Langmuir及Freundlich等溫吸附模式進行模擬並探討其吸附行為。實驗結果顯示，製備出之磁性奈米碳管管徑約為250nm左右，而透過X射線繞射分析儀可得知磁性奈米碳管所含之磁性顆粒晶相有Fe3O4及Fe2O3等，而拉曼光譜在1358cm-1及1594cm-1兩個波長有出現奈米碳管之特徵波峰，而經過超導量子干涉儀測試所得之結果，最大之飽和磁化度為7.298 emu/g。而將所得之磁性奈米碳管作為吸附劑，對鎘、鎳離子進行吸附實驗，實驗結果以Langmuir吸附模式最為符合。本研究成功以磁流體作為磁性顆粒材料，再以填充磁流體之陽極氧化鋁輔助化學氣相沉積法法合成出磁性奈米碳管，並應用於鎘鎳離子之吸附去除。 Carbon nanotubes (CNTs) had been receiving intensive investigation towards the development of their application due to their unique electronic, chemical, mechanical and structural properties. Because magnetic carbon nanotubes (MCNTs) can retains properties of magnetic material and CNTs that can be effectively separated under an external magnetic in aqueous solution. In this reason, MCNTs is suit to apply to waste water treatment. In this research, we use anodic aluminium oxide (AAO) template immersing in magnetic fluid for 12 hours. After drying, the magnetic fluid -loaded AAO templates were put into chemical vapor deposition (CVD) reactor. The temperature in the reactor was then increased up to700-800?C under a constant flow of Ar and C2H2 with flow rates are 160 sccm and 5 sccm. After remove the AAO by sodium hydroxide solution and dry in the oven. Then the obtained MCNTs have been characterized by TEM, SQUID, XRD, TGA and Raman spectra. Two-parameter models of Langmuir and Freundlich isotherm were used to describe the adsorption of Cd (II) and Ni (II) on the MCNTs in aqueous solution. The results showed that the diameter of MCNTs is 250nm. The characteristic peaks at 1358cm-1 and 1594cm-1 obtained from Raman spectra were attributed to CNTs. The XRD analyses of the MCNTs confirmed the crystal phase of Fe3O4, Fe2O3 and graphene. The saturation magnetism of MCNTs is 7.298 emu g-1. Cd (II) and Ni (II) remove by MCNTs were in good agreement with the Langmuir isotherm model. This study demonstrated that MCNTs were successfully synthesized by AAO/CVD methods which were feasible to be applied on the adsorption removal of Cd (II) and Ni (II).
