利用批次與連續式TiO2光觸媒反應器處理水中亞甲基藍之研究

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Title:	利用批次與連續式TiO2光觸媒反應器處理水中亞甲基藍之研究 Batchwise and Continuous Treatment of Methylene Blue Solution via TiO2 Photocatalyst
Authors:	姜美琪
Contributors:	陳煜斌嘉南藥理科技大學：環境工程與科學系曁研究所
Keywords:	亞甲基藍光催化反應 TiO2鋼網光觸媒 photocatalysis TiO2 stainless steel photocatalyst methylene blue
Date:	2009
Issue Date:	2010-06-08 13:55:52 (UTC+8)
Abstract:	本研究分為兩大部份，第一部份為二氧化鈦粉末對亞甲基藍水溶液進行光催化反應。第二部份為TiO2觸媒塗佈不鏽鋼網放置於光催化反應器進行光催化反應。研究結果顯示，在TiO2粉末方面：自製與市售Merck TiO2，在365nm照射下，亞甲基藍濃度10ppm、觸媒添加量0.75g/L，兩者在六小時之脫色率皆超過95%；在觸媒添加量方面，催化效能隨著添加量的增加而遞增，但在超過0.5g/L後，其脫色率增加的效果並不顯著；在反應物濃度方面，兩者在六小時之脫色率，隨著亞甲基藍濃度的增加而下降，在高濃度時，本研究室自製的TiO2觸媒其光催化效能優於市售者；在起始pH值方面，兩種觸媒在非酸性的環境下有較好的脫色效果。在TiO2鋼網方面：批次實驗中TiO2鋼網於亞甲基藍水溶液5ppm、鋼網片數2片與光線垂直方式穢鞢A在365nm紫外光照射下，其脫色率為98.58%，顯示自製鋼網屬於紫外光型光觸媒鋼網；鋼網片數方面，鋼網片數超過2片(含)以上時，其光催化效能優於單片者；光催化效能與鋼網擺放方式或光源入射的角度有關，與光源垂直擺放的脫色率優於與光源平行擺放者；由反應速率常數得知，反應物之脫色率隨著反應物濃度的提升而遞減；在耐用性方面，亞甲基藍5ppm在重覆使用四次後，其六個小時脫色率皆維持95%，顯示自製光觸媒鋼網之耐用性頗佳，若將反應物濃度提昇至10ppm，其脫色率隨著使用次數之增加而遞減；在再生方面，亞甲基藍10ppm經再生後，其活性與新鮮觸媒類相似，顯示本研究的再生方式可延長觸媒鋼網的使用壽命。 TiO2鋼網的連續式實驗結果顯示，在亞甲基藍水溶液5ppm、流量55 mL/min、鋼網片數2片，與光線垂直方式擺放時，其脫色率僅有37%，劣於批次實驗的98.58%脫色率。其可能的原因為連續式中反應物因在槽體循環，故受光照時間較短以致光催化效果降低，建議延長光照時間與增加鋼網片數以加強處理效能。 In this study we divided the experiment into two major parts, part one is about treating methylene blue (MB) solution by TiO2 powder photocatalysis. In part two, we prepared stainless steel with coated TiO2 catalyst for the photocatalytic oxidation of MB. As for the part one of TiO2 powder, the results show that self-made and commercial TiO2 catalyst enabled over 95% color removal after 6hr of reaction in 10 ppm MB solution under the light source of 365nm with 0.75 g/L of catalyst loading. The efficacies of photocatalytic oxidation of MB increased with catalysts loading, but no significant increase when catalysts loading over 0.5g/L. The color removal after 6hr of reaction decreased as initial MB concentration increased. Self-made TiO2 was superior to Merck at the high MB concentration solutions. For initial pH, it was found both catalysts are favorable in non-acidic solutions. In the part two of TiO2 catalyst dip-coated stainless steel of batch run, at the condition of TiO2 catalyst dip-coated stainless steel with 2 plates, a vertical plane to the light source of 365nm, enables 98.58% of color removal after 6hr of reaction in the 5ppm MB solution, showed the TiO2 plates valid for the UV irradiation. The efficacy of photocatalytic oxidation was relative to the number of dip-coated plate, which 2 and above plates was superior to one plate, and also vertical plane to the light source was more efficient than parallel plane. The reaction rate constant showed the color removal decreased as initial MB concentration is raised. As for efficiency of durability, it was found that TiO2 dip-coated stainless steel plate performed 95% color removal at 5 ppm MB even after 4 times repeated usage, which showed favorable durability. However, when the concentration up to 10 ppm, the color removal decreases as the used time is raised; As for efficiency of regeneration, the regenerated catalyst produced almost the same activity as the fresh catalyst, which indicated the method of regeneration for catalyst may prolong the usage time of catalyst steel plate. As for the experiment of continuous flow, under the condition of 5ppm MB, a flow rate of 55 mL/min, with 2 plates, a vertical plane to the light source, the result showed that it performed only 37% of color removal, which is inferior to batch run. A possible reason was the MB solution circulated in the tank might shorten the time of irradiation, led the catalyst to poor activity. We suggest prolonging the time of irradiation and increasing number of steel plate to enhance performance.
Relation:	校內馬上公開，校外一年後公開，學年度：97，77 頁
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Dissertations and Theses

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