二氧化鈦光觸媒已發展了25年，它具有光催化的特性，是一非常出色的環境清淨的光觸媒。
　　超臨界流體技術，號稱綠色化學技術，運轉過程中不會對環境造成傷害，因此本文將以超臨界流體技術，來製備二氧化鈦光觸媒，並使之達到奈米級的程度。
　　當二氧化鈦粒子，粒徑小於10 nm時，因為量子效應的影響，會使其光催化效果提升。本文所敘述的超臨界流體技術，已成功達到次此一目標。
　　最後則摹擬空氣污染降解，以紫外光當光源，甲苯當污染源，以氣相層析儀當偵測器，成功的於短時間內將甲苯降解完畢。

　The titania photocatalysts have been research quartern century. It has characteristic of photocatalysis which is excellent performance of environmetal cleanup.
　The supercritical fluids technology is referred to as a greenchemical thechology. This process operate has not to damage the environmetal. Therefore this procedure allows the preparation of the titania photocatalysis by the supercritical fluids technology and reach to nanometer extent.
　Quantum size effects ( QSE ) occur for titania particles on the order of than 10 nm in size.
　Finally we mimic degradation of air pollutants. It allows the oxidation of airborne toluene into carbon dioxide and water at room temperature in the presence of a titania and UV light source and GC detector on short time.

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