以溶膠凝膠法製備二氧化鈦粉末及其物性探討

The preparation of TiO2 powder by Sol-Gel method

傅俊豪(Chun-Hao Fu)

指導教授 ： 徐開鴻

國立臺北科技大學/工程學院/材料及資源工程系所/碩士(2005年)

摘要

本實驗之研究目的以溶膠－凝膠法製備奈米級二氧化鈦之合成，並分析其物理特性。在實驗過程中，將各別添加硝酸和鹽酸為水解抑制劑，而溶液在經水解膠合後可獲得TiO2-Sol。以TGA/DTA分析決定燒結溫度，乾燥後的氫氧化鈦以FT-IR作官能基的判斷分析。經過高溫燒結後的二氧化鈦經分散後分別以雷射粒徑分析儀來分析做粒徑分析、以SEM觀察顆粒樣貌及大小。
實驗結果得知，經450℃燒結後，所得的二氧化鈦為Anatase相，燒結溫度超過500℃會出現Rutile相，經BET分析之後也發現用溶膠－凝膠法製備的二氧化鈦粉末，在燒結後即有很好的比表面積(跟商業級P-25型二氧化鈦作比較)，其表面積會隨著燒結溫度增加而下降。

關鍵字

二氧化鈦 ； 鹽酸 ； 硝酸 ； 溶膠－凝膠法

並列摘要

The purpose of this experiment is attempted to investigate Nano TiO2 in Sol-Gel method and analysis its physical characteristic. In the experiment process, the nitric acid and hydrochloric acid as the hydrolysis depressants, the product SiO2-Sol would be gained after hydrolysis. Therefore, make TGA/DTA to decides the temperature of calcining. In the same time, the functional-group analysis of Ti(OH)4 powder was demonstrated by FT-IR. Finally, we could gain Nano TiO2 powder after calcination. The basic characteristic of Nano TiO2 were analyzed: the particle size of powder was collected by Laser particle analysis, the morpography of the surface powder and particle size were observed by SEM.
The result of XRD analysis reveal the phase of TiO2 is Anatase as the calcining temperature is about 450℃, the Rutile phase will appear at 500℃, the phase transform would be along with the exaltation of the calcining temperature. In the estimation of surface, we can find the calcining TiO2 powder has the good surface area by BET analysis (compare with business class types P-25), Under the SEM analysis, the powder gathering phenomenon would be observed.

並列關鍵字

TiO2 ； nitric acid ； hydrochloric acid

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