利用UV/TiO2光催化處理鄰苯二甲酸氫鉀廢水的數學模式之研究

Application of mathematical model for the photocatalytic treatment of Potassium Hydrogen Phthalate in wastewater by UV/TiO2

蔡紋勝(Wen-Sheng Tsai)

指導教授 ： 陳文章

國立臺北科技大學/工程學院/化學工程研究所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00165

摘要

因為具有苯環的污染物結構穩定難以處理分解，本研究嘗試以鄰苯二甲酸氫鉀(Potassium Hydrogen Phthalate, KHP)作為廢水處理模型，在反應條件為不同pH值水溶液、不同初始濃度的KHP時，以二氧化鈦光觸媒搭配波長為360nm紫外光照射造成KHP分解的目的，並利用相關動力學模式探討不同條件之下的分解成效，進而根據實驗結果來了解二氧化鈦光觸媒的催化行為模式。
實驗與分析結果發現，在條件為pH 5.5時具有比其他pH值條件較好的分解效率，且傳統的Langmuir-Hinshelwood動力學模式並不能完全顯現出二氧化鈦光催化分解KHP的動力學現象，因為必須先經過觸媒活化的階段，進而才能使光分解效果達到最佳，所以根據此一行為的證實可以將Rabin-Frieden-Ainslie動力學模式引用至二氧化鈦光觸媒光催化系統中運用，並進行各參數改變的模式模擬，藉此建立二氧化鈦光分解KHP的數學模式，並以實驗數據與數學模式對照，即可了解不同反應條件對於數學模式及其參數的影響。

關鍵字

二氧化鈦 ； 鄰苯二甲酸氫鉀 ； 光催化處理 ； 動力學模式

並列摘要

The benzene ring structures of pollutants in wastewater are adamantine and not easily degraded. In this study, potassium hydrogen phthalate (KHP) was then chosen to be a model system. Under the illumination of 360nm UV, the different experimental conditions of the model system, such as pH value, initial concentration of reactant or light intensity were utilized to study KHP degradation aided by TiO2 photocatalyst.
The experimental and modeling results showed the best conditions for KHP degradation was at pH 5.5. But Langmuir-Hinshelwood kinetic model could not express the complete reaction mechanism of KHP degradation enhanced by TiO2 photocatalyst. Because the photocatalyst that required to the best catalysis efficiency should be activated by UV illumination before KHP degradation. According to above results, it confirmed that the kinetic model including the cooperative effect in terms of RFA model may be used for describing the photocatalytical mechanism of TiO2. In this study, we observed the influence at every step for the complete reaction mechanism in different conditions and also interpreted the significant parameters of the proposed model.

並列關鍵字

TiO2 ； Potassium hydrogen phthalate ； Photocatalyst ； Kinetic model

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