本研究以陽極氧化法在含氟化物的電解液中製備陣列式二氧化鈦奈米管光觸媒，並以場發式電子顯微鏡、X-射線繞射光譜儀以及定電位/恆電流儀對光觸媒表面形態及結晶型態以及光電流進行物性分析。除此之外，表面電性與表面元素分析則是利用介達電位儀和X射線光電子能譜儀進行分析。研究中以UV/TiO2 nanotube arrays程序針對酸性染料-AR4進行光催化降解，探討觸媒燒結溫度、觸媒表面型態、光強度與染料初始值濃度對光催化降解的影響。研究結果顯示，光催化的能力與觸媒表面型態有相當大的關係，管徑越小與管長越長的陣列式二氧化鈦奈米管光觸媒具有較佳的光催化降解能力。在本實驗中，陣列式二氧化鈦奈米管的光催化能力也與市售的二氧化鈦(P25)做比較，當管長大於1500 nm時，陣列式二氧化鈦奈米管的光催化能力是大於市售的二氧化鈦。所以在本研究中，改變陣列式二氧化鈦奈米管的表面型態是有效的提升光降解污染物的能力。

The fabrication of TiO2 nanotube arrays was carried out by the anodization in electrolytes containing fluoride in this study. The TiO2 nanotube arrays were fabricated under various operational conditions: water content, anodizing voltage, anodization time and annealing temperature. The dimensions, crystal phase and photocurrent of TiO2 nanotube arrays were determined by scanning electron microscope, X-ray diffraction and potentiostat/galvanostat, respectively. Additionally, zeta meter was employed to analyze surface charge of TiO2 nanotube arrays. The formation of the nanotube structures on titanium during anodization depends on the correlation between electrochemical oxidation (anodization) and chemical dissolution. The competition of electrochemical oxidation and chemical dissolution rates correlate with formation of TiO2 nanotube arrays. The photocatalytic efficiency was determined by studying the photocatalytic degradation of Acid Red 4 in aqueous solution to recognize effect of TiO2 nanotube arrays dimension on the photocatalytic efficiency. Experimental results indicated that the photocatalytic efficiency was influenced significantly with the dimension of TiO2 nanotube arrays. TiO2 nanotube arrays with longer length and smaller inner diameter exhibited better performance of AR4 degradation because of the larger surface area. The application of TiO2 nanotube arrays was effective to enhance the decomposition efficiency of photocatalytic process based on the results of this study.

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