- 學位論文
備製Fe/γ-Al2O3異相觸媒併同Photo-Fenton法結合流體化床降解印刷廢水中酞菁染料之研究
Photo assisted Fenton degradation of PCS dyes from wastewater of printing industry using Fe/γ-Al2O3 catalyst in up-flow fluidized-bed
摘要
本研究混合商業級三氧化二鋁 (Al2O3 )及硫酸亞鐵 (FeSO4 )粉末後，利用含浸法備製出黃棕色之Fe/γ-Al2O3觸媒，觸媒載體為一具強吸附金屬離子特性的γ-Al2O3，將備製出之Fe/γ-Al2O3異相觸媒併同Photo-Fenton法結合流體化床降解印含酞菁染刷廢水。研究結果顯示備製出之Fe/γ-Al2O3異相觸媒，其最佳備制條件以添加20 wt% 之硫酸亞鐵為最佳配比；此外，依據EDS分析結果得知0.20Fe/γ-Al2O3觸媒所含的鐵量最高 (3.02 at%)，其BET量測結果發現比表面積隨鐵/鋁的添加比例增加，但Fe/γ-Al2O3觸媒鐵含量而遞減。在上流式流體化床光催化系統中，水力停留時間控制在90分鐘，隨著觸媒添加量增加反應效果亦增加，於Fe/γ-Al2O3觸媒添加量為60 g/L時，反應去除率可達90%，其pH = 3.5時反應去除效果為最佳。在觸媒回收再利用部分，其Fe/γ-Al2O3觸媒於貫穿試驗後，仍可反覆處理3次之酞菁染廢水；但經回收多次後之Fe/γ-Al2O3觸媒，所含之鐵離子含量於溶液中慢慢遞減，而產生觸媒劣化現象，直接影響觸媒的重複使用性。故本研究建議Fe/γ-Al2O3觸媒回收使用3次之後，更換使用或添加新的Fe/γ-Al2O3觸媒。
並列摘要
Yellowish-browish Fe/γ-Al2O3 powders, synthesized from a dipping method, by mixing aqueous solution containing aluminium oxide (γ-Al2O3) and iron(II)-precursor (FeSO4), were used for photo-Fenton degradation of phthalocyanines dye (PCS) under ultraviolet (UV) irradiation in an up-flow fluidized bed. This study evaluated the catalyst with Fe/γ-Al2O3 weight ratio of 20% exhibited a maximum content of iron (3.02 at%). BET measurements indicated that Fe/γ-Al2O3 catalyst surface areas decreased continuously with increasing Fe/γ-Al2O3 weight ratio. In this study, an optimal dosage of Fe/γ-Al2O3 of 60 g/L was determined from the experimental results. The degradation efficiency of PCs increases as pH decreases, exhibiting a maximum at pH 3.5. The durability of Fe/γ-Al2O3 was evaluated by reusing the photocatalyst 5 times. The results show that the recycled catalyst was capable of repeating 3 runs without significant decrease in treatment efficiency. This study suggests that the replacement of the Fe/γ-Al2O3 catalyst is necessary, after repeated use for 3 runs. The decrease in efficiency of the recycled catalyst occurs due to the Fe ion leaching decreases in each run.
參考文獻
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