本研究主要致力於了解有機物（染料或酚）、氧化劑（過氧化氫）、催化劑（鐵氧化物或離子)與三者之間的相互作用的關係。首先，比較不同種類鐵氧化物對催化過氧化氫降解酚的反應性，找出具有較高催化活性的鐵氧化物；其次，研究氧化酚之後的中間產物（如醌類與草酸等）與鐵氧化物之間的作用（如鐵溶解）與反應（氧化還原），以及各種操作變因（pH值、溫度、反應物與氧化劑濃度等）對於催化氧化系統的影響；接著設計光反應器以增加礦化效能並增加鐵氧化物觸媒的使用壽命；最後，探討提出動力模式並提出系統的反應機構。
在鐵氧化物對催化過氧化氫降解酚的反應性比較研究中顯示，固定化的鐵氧化物（稱為SiG1與SiG2）具有較高的催化效率（可100％降解水溶液中的酚）。當水溶液中含有酚的第一類氧化中間產物醌類（如catehcol與1,4-hydroquinone）時，SiG1與SiG2表面上的三價鐵可輕易的被還原成亞鐵離子溶解出來。本研究亦發現當溶液中的pH值為5時可視為一臨界條件，在此條件下catechol對於SiG1與SiG2的還原溶解效率最差，意即此時的catechol與SiG1之間的作用力最弱。鐵物質與醌類之間的氧化還原作用也意味著：當酚氧化降解時，不僅僅H2O2扮演氧化劑的角色，三價鐵亦是系統中的一種氧化劑，其會氧化酚的中間產物醌等。
除了氧化降解酚之外，進一步應用SiG2催化H2O2成功的降解反應性偶氮性染料（reactive black B, RBB）。由變因討論的研究得到：熱效應（即溫度）對於過氧化氫的分解與反應性偶氮性染料的降解速率影響相當大，本研究亦提出兩階段擬一階動力模式來模擬RBB的降解動力行為。在沒有外加光源的條件下，水溶液中的酚可被氧化成中間產物(如草酸)，但無法完全礦化（轉化成CO2與水，低於40％ TOC移除率），且這些中間產物(如草酸)會導致鐵氧化物持續的釋出鐵離子物質至水溶液中，導致觸媒壽命的降低。
為了改善上述缺點，本研究設計出一水流式光－流體化床反應器，以鐵氧化物催化過氧化氫來礦化酚並藉由紫外光（UV，波長365 nm）來減少釋出的鐵離子；研究成果證實酚可在此光－流體化床反應器系統當中成功地礦化（98% TOC移除率）且觸媒表面所釋出的鐵含量也大大的降低至5mg/L以下。此外，研究中觀察到一有趣的現象，即當使用的H2O2足以完全礦化酚時溶液中的pH變化可以作為礦化程度的指標，當pH從小於3.5提升至大於4.0以上時即表示礦化完成，如此一來可以方便判斷觀察酚礦化的程度，此研究成果應可應用到其他有機物的礦化，後續研究正在繼續探討中。以高級氧化處理水中有機物之程序，酸、鹼藥劑與H2O2是相當大的用藥成本，而本研究發現使用光－流體化床反應器礦化酚可大幅節省40％的H2O2與部分的酸、鹼用藥量，深具應用潛力。
在光催化系統的反應機構探討部分，由最常見的中間產物草酸研究發現，光解SiG2與草酸的錯合物時，所得到的主產物為亞鐵離子與二氧化碳陰離子自由基。在此系統中草酸的分解會消耗水溶液中的溶氧與三價鐵物質。而應用UV/SiG-oxalate程序取代UV/SiG- H2O2程序來降解酚，可以將反應的起始pH條件從4提高至5。SiG1與SiG2已證實具有相當好的H2O2催化活性，本研究提出SiG1與SiG2在無光源條件下的催化H2O2降解酚與其氧化中間產物（草酸）造成鐵溶出的機制，而在有光源的條件下，進一步增加了SiG-oxalate的光解機制。草酸溶解鐵氧化物、catechol還原溶解鐵氧化物、分解H2O2與應用SiG2/H2O2降解染料之動力學模式與參數均在本研究中討論與求得。

This study is aimed to better understand the interactions among organic compounds (azo-dye and phenol), oxidants (H2O2 and O2) and catalysts (iron oxides and iron ions). Firstly, the degradation of phenol by hydrogen peroxide in the presence of four kinds of iron oxides is compared to find the most active catalyst. Secondly, the interactions (dissolution of iron) and reactions (redox) between the oxidative intermediates of phenol (such as hydroquinones and oxalic acid) and iron oxide are investigated. Also, the operation parameters (such as pH, temperature, system loading and concentration of oxidants), which may affect the degradation efficiency of organic compounds, are also studied. Furthermore, the degradation and the mineralization performance were enhanced by a photo-reactor. Also, the recycle life of iron oxide catalyst was increased by the photo-reactor. Finally, kinetics and reasonable reaction mechanism of the system are proposed.
Comparison study of the reactivity of iron oxides reveals that the immobilized iron oxides, namely SiG1 and SiG2, were efficient for the degradation of phenol in the presence of hydrogen peroxide (100% of phenol was degraded). SiG1 and SiG2 exhibited high reactivity for the reductive dissolution process in the presence of hydroquinones (catechol and 1,4-hydroquinone); a critical condition, in which the reductive dissolution was very inefficient, was found at solution pH 5. Furthermore, the redox reactions between iron species and hydroquinones implied that oxidants for the degradation of phenol were not only H2O2, hydroxyl radical, but also Fe(III) species. Thermal effect (temperature) is an important parameter for the decomposition of H2O2 and for the degradation of azo-dye reactive black B (RBB), and a two-stage rate law was proposed to describe the degradation kinetics of RBB. Moreover, the mineralization of phenol is quite inefficient in dark system (< 40% TOC removal efficiency) because the mineralization was retarded by oxalic acid. Also, iron species leaching from the surface of the immobilized iron oxides due to the accumulation of oxalic acid in the absence of irradiation.
In order to improve the mineralization efficiency of phenol, a water-flow type photo-fluidized bed (photo-FBR) was designed to mineralize phenol and to minimize iron leaching. Successfully, the mineralization of phenol (about 98% TOC removal efficiency) and minimization of iron leaching (< 5 mg/L) were achieved in the photo-FBR. An interesting phenomenon was observed that the variation of solution pH also reflected the degree of mineralization. The result also means that the mineralization level of phenol in this system can be conveniently derived by the observation of solution pH variation. In addition to acidic and basic reagents, there is a savings of more than 40% of the H2O2 for the mineralization of phenol in photo-FBR. This also indicates that the cost of applied acid, base and H2O2 in industrial wastewater treatment can be dramatically reduced.
The photolysis of SiG2-oxalate produces ferrous ions and carbon dioxide radical anions. The decomposition of oxalic acid consumes iron(III) species and dissolved oxygen. The application of UV/SiG-oxalate process is able to degrade phenol and to increase degradation efficiency at solution pH 5. The catalyses mechanisms of SiG1 and SiG2 for the degradation of phenol in the presence/absence light were proposed. The kinetics of iron dissolution by oxalic acid, iron reductive dissolution by catechol, H2O2 decomposition and RBB degradation by SiG2/H2O2 were investigated, also the kinetics parameters were obtained.

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