光觸媒是一種催化劑，不須消耗其他能源，只需利用光能便能分解對象物，應用範圍非常地廣泛，通常應用於空氣汙染、水汙染、農業汙染和建築物外表髒汙......等等。本次研究以氧化鋅作為光觸媒，因為氧化還原能力佳且室溫或高溫下狀態穩定的優點，故經常被作為光觸媒原料來源。需要紫外光作為驅動能量來進行淨化空氣、純化水質和去除髒汙等功能
氧化鋅具有光子晶體(photonic crystal)的特性，藉以提升進光量，但其粉末奈米化會有團聚不易分散的問題，因而降低與欲分解物的接觸面積，本研究利用溶膠-凝膠法製備氧化鋅/二氧化矽光觸媒粉末來解決這問題。用溶膠-凝膠法製備而得的二氧化矽乾凝膠(Silica xerogel)粉末，利用其高比表面積的特性使氧化鋅溶膠披覆在上面，藉以增加氧化鋅催化效率。
本研究合成氧化鋅/二氧化矽複合粉末，其為核-殼(core-shell)結構。利用XRD、SEM、FTIR、DTA、BET和UV對樣品進行檢測， XRD觀察氧化鋅/二氧化矽粉末特徵峰，發現在900℃出現矽鋅礦特徵峰；SEM對氧化鋅/二氧化矽粉末表面形貌進行觀察；FTIR觀察氧化鋅/二氧化矽粉末在不同溫度下鍵結鍵結情形；DTA對氧化鋅/二氧化矽粉末進行熱分析；BET的檢測中發現在不同的酸鹼溶液的比例會影響二氧化矽乾凝膠(Silica xerogel)粉末的比表面積及膠化時間；UV來觀察氧化鋅/二氧化矽粉末光性質。在對亞甲基藍催化實驗中，降解17小時後，氧化鋅/二氧化矽粉末相對於TiO2(P25)具有較佳的光催化效果。

Photocatalyst does not need to consume fossil fuel; optical energy will be able to simply decompose a chemical compound. A wide range of applications included air pollution, water pollution, and agricultural pollution and so on. The experiment of this study applies sol-gel method to synthesize ZnO/SiO2 photocatalyst. Zinc oxide has the characteristics of photonic crystals, in order to enhance the amount of light, but the powder nano-aggregation will be difficult to disperse, thus reducing the contact with the product to be exploded area. To solve this problem, ZnO was coated with SiO2,which increases specific surface area of the particle.

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