本研究主要目的為自製高性能光觸媒用於二氧化碳光催化還原反應。自製光觸媒包括銀-鉭系波洛斯凱特型光觸媒與二氧化鈦，皆採用溶膠凝膠法製備，並植入金屬用以改良原有的觸媒，另一方面，將所製得的觸媒與商用觸媒一起含浸不同比例的銅和鎳金屬進行化學改質。然後作物化特性與光學性質之鑑定(XRD、UV-Vis、PL、SEM及TEM)。

X-光繞射分析顯示，以溶膠凝膠法製備的鉭酸銀觸媒在不同煅燒溫度與植入不同重量比例金屬均具有良好的晶相。由UV-Vis吸收光譜可看出，鉭酸銀與二氧化鈦觸媒其對應能隙分別為3.35eV和3.02eV。鉭酸銀與二氧化鈦以溶膠凝膠法植入銅金屬其吸收邊緣有往長波長位移與可見光區吸收提高之現象。由螢光光譜儀可看出，觸媒植入金屬後在觸媒形成各種缺陷或扭曲，能隙中有其他的能階存在，而有捕捉電子能力從而降低電子-電洞再結合機率。
雖然在觸媒的製備與鑑定方面獲得了一些成果，而且曾有將二氧化碳轉化為甲醇的記錄，但二氧化碳的轉化未有預期的表現，且有再現性不穩的情況。可能是反應器系統上的安裝及操作尚未找出適當的條件。因此未能對所製備的各種光觸媒做比較與進一步的探討。

The main objective of this study is to develop a photocatalyst with high activity for the photocatalytic reduction of carbon dioxide (CO2). The photocatalysts prepared include AgTaO3 (perovskite type catalyst) and titania, Both the photocatalysts were prepared by sol-gel method and were further loaded with Cu and Ni. On the other hand, loading CuO and NiO on self-made catalysts and commercial titania were prepared by impregnation method. The physical and photochemical properties of catalysts were characterized by XRD, UV-Vis, PL, SEM and TEM.
The results of X-ray diffraction indicate that perovskite-type AgTaO3 has a good crystal phase at different calcination temperatures and different metal contents loaded by sol-gel method. UV-vis spectra show that the band gaps of AgTaO3 and TiO2 were 3.35 eV and 3.02 eV, respectively. In addition, AgTaO3 and TiO2 loaded with CuO by sol-gel method caused absorption edge extends to longer wavelengths and increased the light absorption in visible region. PL spectra indicate that adding metal to catalysts would cause defect and distortion, Existence of energy levels in gaps which could trap electrons and hence leaded to lower recombination of electrons and holes.
Although some valuable results were obtained from the characterization of photocatalysts, and methanol was identified in the CO2 photocatalytic reduction and CO2 transforming into hydrocarbons was confirmed as well, however the conversion of CO2 was too low and reproducibility was not good enough. These facts might be due to improper installations and operation of the reactor system. Hence we could not compare the performance of various photocatalysts.

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