陽極處理法製備二氧化鈦奈米管並應用於光催化染劑降解之研究

Preparation of Titania Nanotube Employed in Photocatalytic Degradation of Dyeing Agent by Anodic Method

陳彥全(Yen-Chuan Chan)

指導教授 ： 黃英邦

國立虎尾科技大學/工程學院/材料科學與綠色能源工程研究所/碩士(2011年)

摘要

本研究第一部份是以陽極處理法製備出二氧化鈦奈米管(Titania Nanotube)；以鈦片為陽極，白金為陰極，於二甲基亞碸(Dimethyl sulfoxide，DMSO)、磷酸(H3PO4)、氫氟酸(HF)混合電解液中，在固定溫度下，以改變陽極處理的電壓製備出二氧化鈦奈米管；並將二氧化鈦奈米管經450℃持溫6小時退火後，經由XRD分析可知奈米管結構由非晶相結構轉為銳鈦礦結構，以FE-SEM分別觀察試片表面及斷面形態，其奈米管的孔徑範圍約在15∼50 nm。
第二部份是將不同管徑的二氧化鈦奈米管在紫外光照下進行光電流量測，藉以評估其光電轉換效率；其次，將不同管徑的二氧化鈦奈米管分別置入10 ppm的酸性橙色7號染劑水溶液中，經400W的紫外光照射2小時，每15分鐘取樣一次，並以分光度計量測光照後之染劑濃度，溶液濃度都有明顯的降低。
第三部份是將不同管徑的二氧化鈦奈米管分別置入pH 2、4、7、10的標準液中，測試對不同氫離子濃度(pH值)的電位感應性能，其感應靈敏度及響應時間均有良好的效果，由實驗結果顯示，本研究製作出的二氧化鈦奈米管適合應用在光觸媒與pH感測器上。

關鍵字

二氧化鈦奈米管 ； 陽極處理法 ； 光觸媒 ； pH感測器

並列摘要

There are three parts in this study. Firstly, we report the preparation of titania nanotube by potentiostatic anodizing process. Titania Nanotube are manufactured by anodization with electrolyte of mixture of Dimethyl sulfoxide (DMSO), phosphoric acid (H3PO4) and hydrofluoric acid (HF), titanium foil as anode and platinum as cathode at different anodizing potential under constant temperature and concentration conditions. From the XRD diffraction pattern, the amorphous nanotube was crystalled into anatase phase after heat treatment at 450oC for 6 h. FESEM photographs show the morphology structure of TiO2 nanotube. The nanotubes with a pore diameter range from 15 to 50 nm.
Secondly, the electro-optic transfer efficiency of TiO2 nanotube with different pore size was evaluated after photocurrent measurement conducted under UV radiation. Furthermore, the photocatalytic degradation of dyeing agent for both acid orange 7 (AO7) at 10 ppm concentrations by the TiO2 nanotube with different pore size were carried out under 400W UV radiation for 2hr respectively. Spectrophotometer confirmed that concentration were greatly reduced.
Third, use prepared electrodes under pH 2, 4,7,10 the standard solution to test for different concentrations of hydrogen ions (pH value) of the potential sensing performance. The prepared sensors have good sensitivity and response time of the induced effects. Experimental results show that the TiO2 nanotube were suitable for Photocatalysts applications and pH sensor.

並列關鍵字

Titania nanotube ； Potentiostatic anodization ； hotocatalyst ； pH sensor

參考文獻

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