以自生電流Fenton方法降解對苯二胺反應研究

Degradation Treatment of p-Phenylenediamine by Self Electro-generative Fenton Process

謝維哲(Wei-Che Hsieh)

指導教授 ： 顏溪成

國立臺灣大學/工學院/化學工程學研究所/碩士(2010年)

https://doi.org/10.6342/NTU.2010.01624

摘要

在廢水處理中以高級氧化程序最有成效，根據不同的反應機制分類，其中以Electro-Fenton程序與光催化程序最為普遍。本研究探討Electro-Fenton程序，陽極為白金線，而陰極為碳布的系統簡稱AP-CC，藉由陰極碳布通入氧氣，外加電壓進行電化學反應產生H2O2。當系統添加亞鐵離子試劑，則稱為AP-CC-Fe2+，接著將鐵片氧化反應與Fenton程序結合，以鐵片為陽極，鐵陽極氧化產生電流與亞鐵離子，稱為AF-CC-Iapp=0mA。由於系統能自行反應生成電流，因此，反應能持續進行直到有機物被完全分解。
陰極過氧化氫實驗，以氧氣進料流量、起始pH值以及反應溫度做討論，了解施加電流與過氧化氫平均生成速率成正比關係。另外，藉由對苯二胺電解實驗，得到電解反應速率常數約10-4 M.A-1min-1。
對苯二胺在染料及染髮劑與人造纖維合成工業上用途廣泛，所以對環境造成的汙染也相當嚴重。本研究以400ppm對苯二胺為有機物進行降解反應。在AP-CC-Fe2+以起始pH值、亞鐵離子濃度做探討，當pH=3且亞鐵離子濃度為3mM時，為最適化條件，整體反應速率常數為5.35×10-2min-1。
對於自生電Fenton研究，依據AF-CC-Iapp=0mA系統，對起始pH值及氧氣進料流量等系統因素作研究，當pH=7，氧氣進料流量為60ml/min時，有助於對苯二胺降解，整體反應速率常數為2.85×10-2min-1。相較於其他系統，其優點為不需要施加電流，不需要添加Fenton試劑，只需要通入氧氣即可自行反應生成電流、亞鐵離子以及過氧化氫，達到不錯的降解速率。

關鍵字

高級氧化程序 ； 對苯二胺 ； Electro-Fenton程序 ； 鐵陽極氧化 ； 自生成電流

並列摘要

Advanced oxidation process is the best method for wastewater treatment. According to the different classification of reaction mechanisms, Electro-Fenton process and Photo-catalytic reaction have the most common applications. In this study, the AP-CC represented that the anode was Platinum (Pt) and the cathode was carbon cloth which was fed with oxygen. The applied voltage was set to produce H2O2 at the cathode. When the Fe2+ was added into the solution, the system was called AP-CC-Fe2+ system in this research. Afterward, the iron (Fe) replaced the Pt as the anode with zero applied voltage and the system was named AF-CC-Iapp=0mA. Besides, the Fe was oxidized to generate current and Fe2+, and the organics will be decomposed by Fenton process.
The flux of oxygen, the initial pH value, and the reaction temperature were discussed in this experiment of H2O2 formation. The average formation rate of H2O2 is proportional to the applied current. Moreover, the electrolysis constant is 10-4 M.A-1min-1 according to the electrolyzing p-phenylenediamine experiment.
p-Phenylenediamine causes the quite serious environmental pollution because of its popular applications in hair dye and artificial fiber synthetic industry. The initial pH value and the Fe2+ concentration were discussed in AP-CC-Fe2+ system. The optimum condition is pH=3 and [Fe2+]=3mM, and the overall rate constant is 5.35×10-2min-1.
According to the AF-CC-Iapp=0mA system in the self electro-generative process, the influences of the initial pH value and the flux of oxygen on degradation rate were studied. The degradation efficiency was enhanced with the condition of pH=7 and [O2]=60ml.min-1, and the overall rate constant is 2.85×10-2min-1. In the AF-CC-Iapp=0mA system, p-phenylenediamine can be degraded by self electro-generative process without applied voltage and Fenton reagents.

並列關鍵字

Advanced oxidation process ； p-phenylenediamine ； Electro-Fenton process ； anodic oxidation of iron ； self electro-generative current

參考文獻

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