本研究將傳統Fenton法結合外加光源，稱為Photo-Fenton法處理反應性偶氮染料Black B與酚。研究內容分為兩部分，前部分探討pH值、光源強度、[Ox]/[Fe3+]莫耳濃度比值、溶氧狀態對三價鐵離子與草酸水溶液的光還原反應之影響。後部分為以Photo-Fenton系統來處理Reactive Black B與酚，改變操作變因：pH值、初始鐵濃度、過氧化氫濃度、[Ox]/[Fe3+]莫耳濃度比值、溶氧狀態、有無光源，探討其最佳操作條件。

　　實驗結果顯示，鐵還原反應的最適pH值為3，增加草酸與三價鐵莫耳濃度比值跟增加紫外光強度能加速鐵還原的速率，此外在溶液曝氮氣狀態下比有溶氧的環境有更快的鐵還原速率。

　　以Photo-Fenton法處理Reactive Black B的最適操作條件為pH＝3、[H2O2]＝400 mg/L，但增加[Ox]/[Fe3+]莫耳濃度比值會抑制降解速率而變慢。而處理酚最適之[Ox]/[Fe3+]莫耳濃度比值＝2。經過反應能將Black B除色完全，且與酚相同都在系統曝空氣時處理效率最佳。以Photo-Fenton法反應兩小時後能比以Fenton-like法處理將Black B之COD跟TOC去除率從46﹪、31﹪提升至86﹪、86﹪，而處理酚之COD跟TOC去除率也從63﹪、33﹪提升至98﹪、88﹪。

　　This study combined Fenton’s reagent and light, called Photo-Fenton method, to treat azo dye Reactive Black B and phenol. There were two parts in this study. The first part was to evaluate the effect of pH, light, [Ox]/[Fe3+] molar ratio and dissolved oxygen on photoreduction reaction of ferric ions. The second one was to investigate the optimal operating conditions of pH, initial ferric ion concentration, hydrogen peroxide concentration, [Ox]/[Fe3+] molar ratio, dissolved oxygen and lights for treating Reactive Black B and phenol with Photo-Fenton method.

　　Results show that the optimal pH value was 3 for ferric ion reducing reaction. Increasing [Ox]/[Fe3+] molar ratio and UV light can accelerate reduction rate. Besides, the reduction rate was higher with N2 bubbling than that with aeration.

　　The optimal conditions to treat Reactive Black B with Photo-Fenton method were pH＝3 and [H2O2]＝400 mg/L. We found that increasing [Ox]/[Fe3+] molar ratio inhibited the degradation rate of Reactive Black B. The optimal [Ox]/[Fe3+] molar ratio for phenol oxidation were 2. It can be decolorized completely at this condition. Removal of COD and TOC for Black B solution were 86﹪and 86﹪ with Photo-Fenton method and those were 46﹪and 31﹪,respectively with Fenton-like method. Concerning the oxidation of phenol, the removal of COD and TOC for the solution can increase from 63﹪and 33﹪to 98﹪and 88﹪,respectively.

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