本研究之主要目的係探討利用光催化及光電催化程序降解氨氮來探討初始pH值、光源強度、初始溶氧濃度、初始過氧化氫濃度與施加偏壓之大小等變因之影響。在光催化程序中，鹼性條件下，隨著初始pH值上升，氨氮降解之效率隨之增加；然而，在中性及酸性條件下，則沒有氨氮被光催化程序降解。電子電洞對在光觸媒表面上被激發，電洞與觸媒表面之水分子反應生成氫氧自由基，促使氨氮降解。實驗結果中指出隨著光源強度增強，單位時間單位面積提供之光子數將增加，有較好之氨氮降解效率。水中溶氧及過氧化氫可視為電子捕捉劑，與光激發生成之電子反應分別生成超氧自由基及氫氧自由基，不僅抑制了光激發生成之電子電洞對再結合，生成之自由基亦與氨反應，提升氨氮降解之效率；然而，若在水溶液中添加過量的過氧化氫，過氧化氫及其生成之超氧化氫自由基會與氫氧自由基反應，使得氨氮降解之效率下降。
在光電催化程序中，施加偏壓可將在光陽極上生成之電子經由外部迴路導向陰極，減少電子電洞對再結合，進而增加的氨氮降解效率，氨氮降解之效率隨著施加偏壓上升而增加。在有水中溶氧之條件下再施加偏壓可再提升氨氮之降解效率，然而氨氮降解之效率不隨施加偏壓上升而增加。

Photocatalytic and photoelectrocatalytic degradation of ammonia in aqueous solution was studied under various initial solution pH, light intensity, initial dissolved oxygen concentration, initial hydrogen peroxide concentration and bias potential. The photocatalytic degradation of ammonia was found to be enhanced with the increase of initial solution pH under alkaline condition, whereas there was no ammonia degradation occurred in acidic and neutral solutions. The photocatalytic degradation of ammonia enhanced with increasing light intensity in alkaline solution. The removal efficiencies of photocatalytic degradation of ammonia increased to certain extent with the initial concentration of dissolved oxygen and hydrogen peroxide present in aqueous solution. Furthermore,degradation of ammonia by photoelectrocatalytic process in alkaline solution was increased with the increase of application of bias potential. With dissolved oxygen concentration, the increase of bias potential didn’t contribute to enhancement of ammonia degradation.

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