染整廢水結構複雜，具有高色度、高COD及生物難分解等特性，若未妥善處理而排入自然水體 時，將直接造成對水質衝擊。因一般傳統程序如混凝及生物處理等無法有效符合放流水標準，故急 需研發有效處理染整廢水之技術。 利用UV/TiO2程序已被證實可有效處理多種環境汙染物，故本研究擬以此程序處理偶氮染料 Orange G廢水，且為改善TiO2粉末懸浮(slurry)系統操作問題，本研究將不鏽鋼網基材浸漬於Degussa P-25 TiO2懸浮液中，經乾燥處理形成TiO2覆膜，即以此浸鍍(dip coating)方式固定披覆TiO2粉末於不 鏽鋼網上。且探討時間效應、TiO2添加/披覆劑量、染料初始濃度及染料初始pH值條件對偶氮染料 Orange G降解影響。由FE-SEM、XRD及BET等基本性質分析結果可知，觸媒經浸鍍後能均勻披覆於 不銹鋼載體上，平均顆粒大小皆小於30 nm，主要晶體結構為Anatase，比表面積為5.6717 m2/g。實 驗結果顯示UV/TiO2光催化程序可快速有效降低色度，固定TiO2於不銹鋼網之反應程序去除效率比 懸浮式稍差，且需要較長反應時間，但優勢為省去過濾或離心且操作方便。經過60分鐘反應後，添 加12 g/m2及20 g/m2，脫色效率可分別達50.10及59.51%。若將披覆劑量增加至40 g/m2及60 g/m2， 效率可提升至77.58及86.40%。此外，當染料初始pH調整為3時具最佳脫色效果。且染料初濃度提 高使得染料去除率降低。反應模式可用擬一階反應(Pseudo-first Order Reaction)描述，符合Langmiur– Hinshelwood反應動力式，求出k及KA分別為4.05 L.min/mg及4.80×10-2 L/mg。最後經耐久性測試五 次，證明經120 min反應之脫色效率亦可達 95.83％。

Effluent from dye manufacture with complex structure, high color, high COD and recalcitrant for biodegradation directly impact the quality of water body without adequate treatment. The traditional processes such as coagulation and biological treatment may frequently not comply with the effluent standards so that developing the effective technique is very urgent. The process of UV/TiO2 is demonstrated to be effective for many environmental pollutants from research results. In this study, it was applied for color removal of azo dye Orange G. Moreover, the TiO2 (Degussa P-25) particles were dip-coated on the stainless steel net for avoid the operation problem of slurry reactor. The experimental parameters such as time, TiO2 dose/coating dose, initial concentration of azo dye and initial pH were determined for the effect of dye degradation. From FE-SEM, XRD and BET analysis, the results showed the catalyte (anatase) coated homogeneously on the steel net with average particle size less than 30 nm and specific surface area of 5.6717 m2/g. From the results, the removal efficiencies of fixed TiO2 on the steel net were less than the slurry reactor, however, the merit of fixed system was easy to operation for saving filtration or centrifuge. Within 60 minutes, the color removal efficiencies of 50.10 and 59.51% by adding TiO2 particles of 12 g/m2 and 20 g/m2, respectively that enhanced to 77.58 and 86.40% by increasing to 40 g/m2 and 60 g/m2, respectively. Moreover, the initial pH of 3 showed the best color removal. Increasing dye concentrations improved the removal efficiencies that the model meeting Langmiur –Hinshelwood reaction was developed as a pseudo-first order reaction. The k and KA were calculated as 4.05 L．min/mg and 4.80×10−2 L/mg. After 5 times of durable tests within 120 min, the color removal of 95.83% was obtained.