Study on the Heterogeneous Photocatalytic Degradation of Chlorinated Hydrocarbon Compounds in Vapor Phase by Titanium Dioxide as Photocatalyst

本研究係以二氧化鈦為光觸媒,365nm波長之UV 燈管為激發光源,進行二氯乙烯、三氯乙烯、 四氯乙烯之異相光催化分解反應的探討.控制 因子包括反應物濃度、進流氣體速、二氧化鈦 填充量、光照強度、溼度、氧氣含量等.實驗 的進行首先為依據田口式直交表實驗法進行多 因素分析探討,藉以尋求反應最佳操作條件及 瞭解影響顯著之因子,並經由各影響顯著因子 與反應物去除效率的定量關係推估其反應動力式.於反應過程中,分別經由Cl2及CO2的監測,了解 反應物礦化程度.其中間產物則嘗試以GC-MASS予 以鑑定,並推估可能反應機制與途徑.此外,分別 就三種反應器型態(填充床、流體化床、固定 式),比較其反應效率並尋求其最佳操作條件.最 後藉著自然光狀況下的對照實驗,以太陽光取 代UV人工光源,以評估未來實際應用上的可行性

The Study on the Manufacture Nano Catalytic Electrodes and Characteristics Alteration of Dye Wastewater by Electro-Catalytic Technique

水系統中的觸媒材料因可與水反應產生氫氧自由基，其可將有機污染物快速氧化成無害的水與二氧化碳，故廣泛地應用於空氣與廢水處理技術。本研究分別針對各類型觸媒極板的製備與特性分析與電觸媒技術（electrocatalyst）處理污水之效率兩個研究項目進行討論。在製備各類型觸媒極板方面，本研究所使用極板分別為利用定電流電鍍法、陽極氧化法與化學氣相沉積法製備觸媒極板，並以場發射掃描式電子顯微鏡（FE-SEM）與X光能量散譜儀（EDS），觀察極板表面形貌與元素組成，使用Brunaure Emmett Teller（BET）法分析所製備的觸媒極板的比表面積。並針對極板基材、極板表面觸媒種類、披覆厚度與表面形貌、極板組合型式、電壓梯度與電流密度等相關參數進行多因子影響比較實驗，找出最適之觸媒極板的製備條件，以作為後續應用操作之依據。本計畫擬提出多年期研究計畫，期待能較完整地釐清奈米觸媒電極製備、基本物化特性、自由基產生相關學理，瞭解降解染料廢水的反應速率與機制，期待能於水處理技術中建立一系列創新處理程序。Hydroxyl radicals can be produced by water molecule interacting with the catalyticmaterials in the aquatic system. Hydroxyl radicals are effectively able to oxidize the organicpollutants into harmless water and carbon dioxide, therefore, they have been applied towastewater and air pollution treatment extensively. This study has been composed by twoparts such as manufacture method and characteristic analysis of different catalytic electrodesand the organic concentration removal efficiency of dye wastewater decomposed by theelectro-catalytic technique, respectively.In the aspect of manufacturing different catalytic electrodes, This study has beencomposed by three manufacture methods such as the electroplating process, anodic oxidationtechnique and chemical vapor deposition. The surface features and element composition of allelectrodes were observed by field-emission scanning electron microscope (FE-SEM) andX-ray energy dispersive spectrometer (EDS), individually. And use Brunaure Emmett Teller tomeasure the surface area of the catalytic electrodes. For assist our research in the future. Wewill test the influence of organic concentration and decolorization removal efficiency undercatalytic thickness, surface features, combination of catalytic electrodes, system potentialgradient and current density.The research will to bring up the three years project. It help us to understand themanufacture nano catalytic electrodes, the basic of physical and chemical characteristics andthe theory on the yield of hydroxyl radical. At last, the project will calculate the costconsumption and compare with general improve process of dye wastewater treatment system,then, it will evaluate the economic benefits. The ones that used are practical in order to giveconsideration to the theoretical foundation and real factory