本研究使用複合氧化技術(紫外線/過氧化氫/二氧化鈦)降解水中四甲基氯化銨，並且使用錳作為負載物 ，以含浸法改質二氧化鈦粉體及溶膠，以分析改質前後對光催化反應之影響。藉由改變反應參數(光觸媒用量、錳改質效果、過氧化氫濃度、四甲基氯化銨濃度等)探討其對四甲基氯化銨去除率的影響。另以紫外光光譜儀、X光繞射儀、掃描式電子顯微鏡、螢光光譜儀對改質後的光觸媒進行材料分析，以確認改質前後之光電特性變化及其對光催化反應之影響。實驗結果顯示，光觸媒用量因增加反應面積與遮蔽交互作用下有一最適值，在應用複合氧化程序中，初始過氧化氫濃度亦有最適用量，係因 隨著過氧化氫濃
度的增加，能產生的氫氧自由基數量增多，進而提升氧化力。而過量的過氧化氫則會扮演捕捉劑的角色，使氫氧自由基數量減少，進而光催化反應速率相對較低。在錳改質光觸媒方面，使用0.1% 錳改質二氧化鈦可減少電子電洞再結合速率而提升反應速率。本研究藉由氣相層析質譜儀與陰陽離子層析儀分析中間產物，顯示 TMA+經光催化反應後會產生三甲基胺、二甲基胺、甲胺及最終產物(NH4+、NO2-、NO3-)。整體實驗結果顯示，使用紫外光/二氧化鈦/過氧化氫的批次反應器中，可將100ppm 的四甲基氯化銨在4小時達成移除率約93%，礦化率為60％，與紫外光/錳改質二氧化鈦系統所得之TMA+移除率近似。在使用填充床反應器模擬實廠處理時，紫外光/過氧化氫/二氧化鈦-球型載體系統，可以在4小時後達成99%的TMA+移除率以及67%礦化率，為吸附與光催化反應的協同作用。兩者系統皆顯示複合氧化程序(紫外光/錳-二氧化鈦/過氧化氫)可成功將水中四甲基氯化銨移除並且提高礦化率，達水質淨化之需求。

The degradation of tetramethylammonium chloride in aqueous solution via com-posite oxidation process (UV/TiO2/H2O2) was studied in this work. The manganese-modification of TiO2 surface was carried out with using impregnation method for photocatalyst powder and sol. The effects of amount of H2O2, manganese modification, concentration of tetramethylammonium chloride, and amount of TiO2 on removal efficiency of tetramethyl ammonium ion (TMA+) and total organic carbon (TOC) were investigated. The surface analyses on the TiO2, evidenced from X-ray diffractometry (XRD), scanning electron microscope (SEM), UV-VIS spectroscopy, and fluorescence spectrometer (PL), indicated the effect of manganese modification on physico-chemical properties and photocatalytic activity.
Results showed that the presence of optimal usage amount of photocatalyst, 100 mg/L, was resulted from the increase in reaction area and light shielding effect. There was also an optimal dosage amount of H2O2 for this reaction. The amount of hydroxyl free radicals was increased with the increase in H2O2 concentration. The excess of H2O2 would inhibit photocatalytic activity due to H2O2 played a role of hydroxyl radical scavenger as it was overdosed. The photocatalytic reaction rate was enhanced with using 0.1wt%-Mn modification, which retarded the electron-hole recombination rates. To clarify reaction mechanism, the qualitative analyses of samples were carried out with using gas chromatography-mass spectrometry (GC-MS) and ion chromatography(IC). Trimethyl amine, dimethyl amine, methylamine, and final products (nitrite, nitrate, and ammonium ions) were found after photocatalytic reactions.
In this work, removal efficiency and mineralization efficiency of 100 mg/L tetra-methylammonium chloride in the UV/TiO2/H2O2 batch system reached 93% and 60%after 4 h of reaction, respectively. In order to simulate the field state, a packed bed reactor equipped with photocatalyst-coated meaical stone was further established for degrading tetramethylammonium chloride. In this system, 99% removal efficiency and 67% actual mineralization were achieved in the presence of synergic effect of photocatalysis and adsorption. As described above, the composite oxidation process (UV/Mn-TiO2/H2O2) can be used for removal and mineralization of tetramethylammonium chloride in aqueous solution successfully, which can be applied to purify water in high tech industries.

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