本實驗主要是利用溶膠-凝膠法(sol-gel method)來合成P/Si -TiO2光觸媒。實驗的過程，在固定摻雜物(磷、矽)的總莫爾添加量的情況下改變磷、矽之莫爾比，以探討磷和矽的添加對二氧化鈦銳態礦相態的維持、粉體的尺寸和粒徑分散性與其光催化效率的影響。實驗程序中固定[Ti]：([P]+[Si])的莫耳數比97：3，僅改變[P] / ([P]+[Si])的莫爾比，依次為1、0.67、0.5、0.33、0。反應溶液在90oC回流反應4小時；反應後經90oC乾燥24小時並以不同熱處理溫度(600oC-1000 oC) 煆燒2小時以製得所需粉體，接著再進行粉體的特性分析。實驗的結果顯示：(1)利用溶膠-凝膠法可以成功的合成奈米級P/Si -TiO2可見光型光觸媒，且其銳鈦礦結構可維持至900oC並具有良好的光催化活性；(2)當[P]/([P]+[Si])=1/3和1/2時，P/Si -TiO2於900oC煆燒後粉體大小仍在奈米尺寸且仍然呈現鬆散的堆疊；(3) 動力學分析指出[P]/([P]+[Si])=0.5的P/Si-TiO2的粉體且有最大的反應常數，意味著有著最佳的光催化能力。 The P/Si-TiO2 nanoparticles were synthesized by a sol–gel method. The contents of dopants (i.e., P and Si) were controlled at [P+Si]/[P/Si- TiO2]=0.03. The effects of relative ratios of dopants (i.e., R≡[P]/[P+Si]) and calcinations temperatures on phase transformation, crystallite sizes, and photocatalytic activity of the gel-derived P/Si-TiO2 were investigatied. The experimental results indicate that (1)visible light activated P/Si-TiO2 photocatalysts can be produced using the sol-gel technigue; (2)being calcined at 900oC, the P/Si-TiO2 specimens of R= 0.33 and 0.5 are still composed of loosely packed nanoparticles and show good photocatalytic abilities; (3)in whole, the P/Si-TiO2 nano- particles of R=0.5 calcined at 600~900oC possess the best performance in photocatalytic activity, under both 365nm UV light and white light irradiation.
