土壤地下水污染整治技術常使用現地化學氧化法處理土壤地下水中有機污染物。過硫酸鹽(Persulfate)經由催化反應會產生高反應性的硫酸跟自由基(SO4-．)與氫氧自由基(OH．)，具有氧化有機污染物的能力。本研究利用紫外光催化過硫酸鹽去除水中有機污染物質，目標污染物質分別為芳香族(甲苯、乙基苯)、含氯有機物(二氯乙烯、三氯乙烯、四氯乙烯)、甲基第三丁基醚，實驗使用的紫外光源波長主要為365 nm，實驗是以批次式進行氧化動力實驗，改變水中紫外光強度與pH值氧化水中目標污染物，目標污染物初始濃度範圍為10-20 mg/L。為瞭解不同控制條件下，光催化過硫酸鹽產生自由基的效率，實驗運用化學探針技術，利用碳針化合物(Probe compound)對氯苯甲酸(p-CBA)計算出不同控制參數下自由基與氧化劑濃度比值(Rct)。
　　研究結果顯示紫外光結合過硫酸鹽的系統下，目標污染物皆可被降解。在未控制pH值環境下(pH 3)，紫外光強度205 W/m2，目標污染物皆可在反應時間20分鐘去除達九成以上；反應過程中，過硫酸鹽濃度變異不大，氧化模式呈現假一階反應。芳香族(甲苯、乙基苯)的氧化去除率隨著pH值增加而下降；含氯有機物(二氯乙烯、三氯乙烯、四氯乙烯)的氧化去除率則是酸性≅中性>鹼性；MTBE的氧化模式與芳香族的趨勢較為相近。由化學探針的實驗結果計算出紫外光結合過硫酸鹽的系統下，pH 3和pH12的Rct值分別為3.65×10-10和2.65×10-11，此結果顯示，產生自由基的效率pH 3 >>pH12。將Rct代入預測模式可以合理預測光催化過硫酸鹽在pH 3和pH12下目標污染物的去除效率。

　　In-Situ Chemical Oxidation (ISCO) is an increasingly popular method for the remediation of groundwater and soils contaminated by organic chemicals. Persulfate is one of the ISCO methods recently developed. Persulfate anion can be activated by catalyst, light and heat to form sulfate radical and/or hydroxyl radical under different pH conditions. In this study, UV365 nm-assisted persulfate was proposed to treat six pollutants commonly observed in contaminated groundwater. The targeted chemicals include two aromatic hydrocarbons, toluene and ethylbenzene, three chlorinated hydrocarbons compounds dichloroethylene, trichlorethylene, and tetrachlorethylene, and methyl tert-butyl ether (MTBE). Kinetic experiments were conducted using batch reactors with deionized water under various UV intensities and pH values. In the experiment, the initial concentrations of the studied chemicals are controlled in range of 10 to 20 mg/L. A probe compound for interpreting radical formation, p-chlorobenzoic acid (p-CBA), was also spiked and measured in the experiments.
　　Experimental results show that the targeted contaminants can be degraded in the UV/persulfate system. For pH=3 and, UV-light intensity of 205 W/m2, 90% the studied chemicals can be removed within 20 minutes. Because persulfate concentration remained constant in the reaction, a pseudo-first-order kinetic model was successfully employed to describe the oxidation kinetics for the chemicals in the UV/persulfate system. The degradation efficiency of the aromatic compounds decreased with increasing pH value, while that of the chlorinated organic compounds follows the order of acidic≅ neutral> alkaline. From the oxidation results of the probe compound, the radical formation ratio, Rct, is estimated to be 3.65×10-10 and 2.65×10-11 for the condition of pH=3 and pH=12, respectively, probably due to the fact that radical concentrations was higher at pH=3 compared with that at pH=12. The extracted Rct values for hydroxyl radicals and sulfate radicals were further used to simulate and predict the degradation kinetics of the studied chemicals. The models were able to capture the trends of degradation kinetics for all the chemicals studied, suggesting that the model employed is reasonable for the UV/persulfate systems.

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