過硫酸鹽為一種已知很有效用的氧化劑，被廣泛應用在高分子乳化聚合反應的起始劑、游泳池清潔劑、漂白、印刷電路板的微蝕刻、以及分析用的總溶解有機氮和總有機碳。最近過硫酸鹽更被用於土壤以及地下水復育的現址氧化技術 (in-situ chemical oxidation, ISCO)。
過硫酸根分子可以斷裂成硫酸根自由基，因具有強大的氧化能力，可用於氧化有機污染物質。硫酸根自由基會透過搶奪受質的電子進行氧化作用，而自身形成硫酸氫根 (HSO4-)，於水中會再進一步解離成硫酸根與氫離子。目前已經有許多種方法可用於促進硫酸根自由基的生成，如透過光化學法、熱、過渡金屬、金屬氧化物、螯合金屬，超音波、放射線等等。而在這些方法之中，熱與金屬的催化方式備廣泛的研究，特別是現址氧化技術的領域。
本論文主要探討以光催化的過硫酸進行氧化的研究，對象處理物為四氟丙醇──一種有機氟化物。本研究發現在氧化過程中，pH值不是影響處理效率的重要因素。而利用過硫酸光氧化技術可達到非常高的曠化率 (>99.5% 的TOC去除率)。除此之外，本研究提出四氟丙醇的脫氟反應是二階段式脫氟程序，於脫氟反應中每一次硫酸根自由基的攻擊，會造成兩個碳氟鍵的斷裂。實際使用欲達到四氟丙醇的95%以上的礦化率，初始時至少需要添加四倍於四氟丙醇濃度的過硫酸鹽。

Persulfate salts have been known to be an effective oxidant in emulsion polymerization as initiator, swimming pool cleaning, bleaching, micro-etching of printed circuit board, and analysis of dissolved organic nitrogen and total organic carbon. Recently, persulfate salts are further used in in-situ chemical oxidation (ISCO): remediation of soil and groundwater.
Persulfate can break down into sulfate radical (SO4-‧) which is effective in oxidize organic principally by subtracting an electron from substrate and forming hydrosulfite ion (HSO4-). There are many approaches to initiate the reaction of sulfate radicals forming, by light irradiation, thermal, transition metal, metal oxide, chelated metal, supersonic, and radioactivity. Among these approaches, methods by thermal and metal is widely studied especially in the field of ISCO.
This study investigated the photo approach to activate persulfate (formation of sulfate radicals) to treat 2,2,3,3-tetrafluoropropan-1-ol (TFP), a organic fluorocompound. It has been found pHi value does not apparently affect the treating efficiency. And the mineralization of TFP achieves very high extent (>99.5% TOC removal). The defluorination of TFP is postulated in 2 stages of C-F bond cleavages by each sulfate radical attack. To achieve more than 95% mineralization of TFP, the practical dosage of persulfate is 4 times by the initial molar concentration of TFP.

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