鐵樹脂觸媒之特性及其對水溶液中硝基酚氧化活性之探討

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Title:	鐵樹脂觸媒之特性及其對水溶液中硝基酚氧化活性之探討 Characterization and activity of FeIII-resin catalyst for the oxidation of nitro- phenol in aqueous
Authors:	莫致豪 Chih-Hao Mo
Contributors:	陳世雄嘉南藥理科技大學：環境工程與科學系碩士班
Keywords:	三價鐵樹脂觸媒觸媒氧化酚的廢水過氧化氫 and hydrogen peroxide phenolic wastewater catalytic oxidation Fe(III)-resin catalyst
Date:	2004
Issue Date:	2008-10-20 15:39:51 (UTC+8)
Abstract:	本研究主要是利用高分子樹脂，以含浸氯化鐵FeCl3.6H2O製備而成鐵型樹脂觸媒，將此型觸媒應用於過氧化氫氧化系統，降解含 2-硝基酚污染之廢水，系統中藉由有機物 (2-NP)與自由基競爭系統內的過氧化氫 (H2O2) ，所產生的強氧化能力的氫氧自由基 (˙OH) 決定2-硝基酚降解之效率。2-硝基酚觸媒氧化降解之影響因子包括：過氧化氫濃度、觸媒含量、樹脂觸媒中Fe+3含量、溶液 pH 值、反應溫度等。本研究結果顯示添加高劑量之氧化劑與觸媒對於污染物降解速率有明顯提升，研究結果也得知偏酸性與高溫條件下有助系統氧化能力之提升。樹脂觸媒氧化硝基酚於適宜條件下，其硝基酚氧化效率與COD去除率皆為高達 99%及70%以上，在於氧化反應時間終了2小時。其氧化速率一般而言符合擬一階之反應模式。本研究結果亦發現硝基酚氧化過程中其硝基之脫去速率強烈受到化學環境之影響，脫去之硝基以亞硝酸鹽形態出現而最終被氧化成硝酸根離子之形式，其中亞硝酸鹽於氧化過程中幾乎完全轉化成硝酸根之型式，另外本研究亦針對樹脂觸媒之氧化活性作過詳細評估，由於觸媒重複試驗也證明回收再利用的樹脂觸媒經 4次重複試驗後在降解污染物的效率上仍然可達 99%以上。 FeIII-resin catalysts were prepared by using weak acid ion-exchanged resin as support. FeIII-resin catalytic peroxide oxidation processes were applied to deal with 2-nitro phenol (2-NP) wastewater. The degradation of 2-NP was processed by high actively hydroxide free radical in oxidation. In order to investigate the influencing factors on catalytic activity, serial experiments of FeIII-resin catalytic oxidation were employed to improve the performance of catalytic oxidation for 2-nitro phenol wastewater. The influences of catalytic oxidation were considered as, concentration of hydrogen peroxide, catalyst dosage, iron content in catalyst, pH in oxidation, and reaction temperature, by evaluating the removal of pollutant and COD removal. Experimental results showed that over 99% 2-NP and 70% of COD removal can be achieved in 2 hours oxidation. The experimental data of this study can be well described by the pseudo first-order model and the rate constant showed a strong dependence on the reaction conditions. Reaction temperature shows a strong influence on oxidation, it was indicated that the initial reaction can not start below 60℃ and then the reaction rate increased with increasing the reaction temperature. The inhibit behavior also can be observed at higher pH environment in this catalytic oxidation. Base on those results, it was found that the operation temperature, pH, H2O2 concentration in oxidation play more important roles than the other factors in this catalytic oxidation process. The denitration process was found in oxidation, it also observed that the two steps denitration process was followed in nitration formation. Finally, this study showed that the stability of FeIII-resin catalyst showed no significantly decade via a four times runs in oxidation process and this study also showed that the resin catalytic oxidation is an efficient method for the treatment of industrial 2-niro phenol wastewater.
Relation:	校內一年後公開，校外永不公開
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Dissertations and Theses

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