本論文研究為使用二氧化鈦進行光催化降解磷化氫氣體之反應，其可分為反應動力學、光觸媒材料改質與磷化氫氣體定量分析等三部份，在反應動力學部份中，改變不同反應參數，進料濃度、流率、氧氣分率、光強度、相對濕度與觸媒量來進行反應機制之探討，以推導出合理的反應動力學模式，在此部份使用吸附動力學Langmuir- Hinshelwood model做依據，並與Power Law模式進行比較。此外，進一步探討在不同光源(UVA-365nm與UVC-254nm)激發下的光催化反應，可證實不同光源所產生的能量對於磷化氫降解的影響。
在光觸媒材料改質的部份，以金屬與非金屬改質二氧化鈦做光催化降解反應，在金屬部份使用共沈澱法(co-precipitation)與光沉積法(photodeposition)進行討論，金屬之使用分別為白金、金、銀、鈀、鐵、鎳與銅等七種金屬。
共沈澱法中，以白金改質效果最好，依次為鈀、金、銀、銅、鐵及鎳，而第二部份則以銀來進行光沉積法，可發現在銀的濃度為7×10-6M時，即可有效地提高磷化氫的降解速率。
非金屬改質則以葡萄糖為碳源，並使用浸鍍的方式製備含碳之二氧化鈦薄膜，在二氧化鈦溶膠中，葡萄糖含量為25%時，可以有效地提高光催化反應效果，最後將其金屬與非金屬改質之光催化效果進行比較，並探討其於商業上之應用價值。
第三部份則以此反應程序來發展分析氣相中磷化氫濃度之技術，利用不同光催化反應結果，以傅立葉紅外線光譜儀(FTIR)、X-ray光電子能譜儀 (XPS)、離子層析儀(IC)與感應耦合電漿發射光譜(ICP-AES)分別分析氣相中磷化氫濃度變化以及在光觸媒表面生成磷酸鹽含量，藉以建立濃度校正曲線，並以FTIR光譜分析磷化氫氧化後生成的產物。此部份預計可發展出低濃度磷化氫氣體之分析程序。

In this work, the photocatalytic degradation of gaseous phosphine over TiO2 under UV illumination in a continuous flow reaction was investigated in detail, including reaction kinetics, mechanism, and quantification of gaseous phosphine.
In first part, the effects of phosphine concentration, UV light intensity, oxygen concentration, retention time, relative humidity and amount of catalyst on photocatalytic reaction rate were studied for development of kinetic model. A rational reaction mechanism was satisfactorily developed by using Langmuir-Hinshelwood model and PFR design equation. Moreover, the quantum efficiency of photocatalyst under UVC illumination was less than that under UVA illumination.
In second part, three methods for modification of TiO2, co-precipitation, photodeposition, and carbonaceous impregnation, were carried out for the enhancement of photocatalytic reaction rate. The results indicated that the silver- and carbon-modified titania have good activities than pristine sample. The optimal concentrations of silver nitrate and glucose were 7×10-7 M and 25 wt% for the photodeposition and carbonaceous impregnation procedures, respectively.
Thirdly, the photocatalytic oxidized products of phosphine in the gaseous phase and on the TiO2 surface were respectively determined by fourier transform infrared, X-ray photoelectron spectroscopy, ionic chromatography, and inductively coupled plasma-atomic emission spectrometer. These results indicated that phosphate (PO43-) and phosphorus pentoxide (P2O5) were generated in this reaction. A simply quantative method for gaseous phosphine with small concentration was established preliminary with analyzing the phosphrous deratives by IC and ICP-AES.

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