本研究探討過氧化氫/二氧化鈦/可見光催化系統下，銅綠微囊藻(Microcystis aeruginosa)細胞完整性的變化、及後續的微囊藻毒(microcystin)釋出與降解情形。研究中分別就二氧化鈦、過氧化氫、氫氧自由基與可見光等不同因子，對於微囊藻細胞完整性的影響進行分析，發現過氧化氫與可見光的加成效應下是影響細胞完整性的顯著因子，較低濃度的氫氧自由基(10-14-10-15M)並無法影響細胞完整性的下降速度。雖然如此，氫氧自由基卻是研究中降解微囊藻毒的主要因子，愈高濃度的氫氧自由基其藻毒降解能力愈高。
針對微囊藻細胞完整性的下降以及微囊藻毒的釋出與降解，本研究進行了幾種常見的細胞破裂模式分析。在這些模式當中，Modified Chick-Watson Model為最能有效模擬細胞完整性的動力模式，另外結合Modified Chick-Watson Model與微囊藻毒釋出與降解之推估模式，帶入文獻或實驗中的參數後，能合理描述與預測水樣中的不同時間的微囊藻毒濃度變化。本研究對細胞完整性與藻毒釋出與降解的研究結果、以及後續的動力模式模擬，能做為過氧化氫與二氧化鈦應用於自然水體的藻類控制之參考。

Effects of H2O2 and Titanium dioxide (TiO2) on Microcystis aeruginosa and the subsequent, release and degradation of microcystins (MCs) under visible light was investigated. Four factors namely TiO2, H2O2, hydroxyl radical (·OH), and visible light were examined individually for their effects on cell integrity of Microcystis. It was observed that the additive effect of H2O2 and visible light is significant on the reduction of Microcystis cell integrity. The low concentration of ·OH produced in the experiments (10-14-10-15 M) is not able to influence the rate of cell rupture. Nonetheless, results of MCs concentration in the system indicate that ·OH is crucial for the degradation of MCs released from ruptured cells. Higher concentrations of ·OH resulted in higher degradation rates of MCs.
A sequential model, including one sub-model to simulate the kinetics for cell integrity of Microcystis, and another one to describe the release and degradation of MCs, was developed in this study. Among the commonly used models for describing cell rupture, the Modified Chick-Watson model gave best simulation for the change of cell integrity over time. To further describe the concentration change of MCs in the system, the Modified Chick-Watson model was combined with the degradation model for MCs in water. The results show that the models are able to predict the observed MC concentrations in the water, using input parameters either measured from separate experiments or obtained from literatures. The developed sequential model is reasonable to describe the experimental systems and may have the potential to be used to evaluate the application of hydrogen peroxide and titanium dioxide in the control of cyanobacteria in fresh water bodies.

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