本研究主要目的為氣相污染物在光觸媒反應之效率探討、利用光觸媒反應器開發及光觸媒改質提升反應效率，本研究分別利用連續式微分光纖反應器、陣列式新型光纖反應器及環狀光反應器進行UV/光觸媒程序分解揮發性有機氣相污染物。在連續式微分光纖反應器之反應系統的部分，分別針對氣相污染物苯、三氯乙烯及異丙醇，探討有關UV光強度、反應物濃度、反應物滯留時間、濕度等操作因素對反應物的轉化率及礦化程度之影響情形，實驗結果顯示以UV/TiO2程序在連續式微分光纖反應器中進行氣相揮發性有機物的光催化分解研究時，處理效率則主要受UV光強度、氣相有機物進料濃度、相對濕度大小及反應物滯留時間等因素的影響。

此外，本研究嘗試利用光纖實驗結果所得知之光纖特性，發展出一陣列式新型光纖反應器，並以處理氣相異丙醇為污染物探討陣列式新型光纖反應器之可行性及其光量子產率。實驗結果顯示連續式微分光纖反應器、陣列式新型光纖反應器之量子產率均比環狀反應器高。本研究也利用添加白金、銀來進行光觸媒改質，期以降低光觸媒之電子-電洞結合趨勢，進而促進光觸媒之光利用率，探討改質光觸媒在光觸媒催化程序的影響，依據實驗結果顯示添加白金、銀均能有效提升分解效率，量子產率均比純P-25 TiO2高。

本研究亦針對微分光纖反應器及環狀光反應器，推導建立適用於光反應器之設計方程式，並以實驗結果驗證其可行性，以作為此類光反應器將來在反應器操作與開發時之研究基礎，並評估反應器進行光催化反應之潛力。從結果顯示此方法可有效地模擬異丙醇分解的轉化率，並合理預測光反應器之光量子產率情形。

本研究也利用電腦輔助流體力學(CFD)之計算與模擬，具體描述本研究所使用之環狀光反應器內的流體流動型態及流速分佈，且由模擬結果發現，光反應器內部實際的流動現象並非理想層流，有許多光觸媒並無法有效利用，本研究利用模擬的結果進而提出反應器設計概念上之相關建議。

The main objective of this study is to develop a simple, energy-efficient, photoreactor for operating at room temperature. In this study, the photoreactor type included a differential-type optical fiber reactor, annular photoreactor and new optical fiber reactor. Gaseous 2-propanol (isopropanol, IPA), trichloroethylene (TCE) and benzene were chosen as the target compound in this study because IPA, TCE and benzene were common indoor air pollutants.

A differential-type continuous flow optical fiber photoreactor that used single optical fiber coated with TiO2 photocatalyst as light delivery support of photocatalyst was investigated for treatment of gaseous volatile organic compounds. The decomposition of gaseous volatile organic compounds by UV/TiO2 process in an optical fiber photoreactor was studied under various UV light intensities, humidities, and reaction time of carrier gas (flow rates). Conversions of gaseous volatile organic compounds were increased with increasing light intensity, reaction time. Furthermore, the decomposition of gaseous volatile organic compounds was strongly influenced by humidity in the airflow, and the optimum performance was achieved under relative humidity of 15-25%. Experimental results indicated that TCE had lower adsorption constant but it was the most degraded constituent. This might be that TCE decomposition could lead to formation of free radicals Cl• which accelerated the reaction. The apparent quantum yields for the differential-type optical fiber photoreactor were observed to be higher than those for the annular photoreactor.

In this work, designing and fabrication of a new gas-phase optical fiber photoreactor was introduced and operated under various parameters, such as UV light intensity and initial concentration for the photocatalytic decomposition of acetone. Experimental results indicated that increasing the UV light intensity or decreasing initial concentrations of IPA by UV/TiO2 process would result in improving the decomposition and mineralization efficiencies. The apparent quantum yield of the new optical fiber photoreactor is about 2 times greater than that of the annular reactor.

The purposes of this research include the investigation relating to the modification of photocatalyst. Modification of photocatalyst via doping metal on the TiO2 photocatalyst is assessed for possible application. The removal and mineralization of IPA under radiation of various light intensities were studied. For experiments conducted with gaseous IPA under UV light irradiation, the photocatalytic activity of Pt or Ag deposited TiO2 surface was significantly superior to that of TiO2 only ones. The increase of UV light intensity and retention time improved the decomposition of IPA. However, both the apparent quantum yield for IPA decomposition and CO2 production were decreased. A mathematical model combining the continuity equations and Langmuir-Hinshelwood (L-H) kinetics was established to adequately describe the reaction behavior of IPA decomposition in the annular photoreactor with various photocatalysts and gaseous volatile organic compounds decomposition in the differential-type optical fiber photoreactor. The apparent quantum yielded can be modeled and calculated for the decomposition of IPA by photocatalytic oxidation in the annular photoreactor coated with TiO2 and Pt/TiO2.

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