二氧化鈦光催化降解偶氮染料之反應特性

Reaction Characteristics of Photocatalytic Degradation of Azo Dyes in Titanium Dioxide Suspensions

薛珮穎(Pei-Ying Hsueh)

指導教授 ： 莊瑞鑫

元智大學/工程學院/化學工程與材料科學學系/碩士(2009年)

https://doi.org/10.6838/YZU.2009.00227

摘要

染料廢水主要具高色度、高COD及生物難分解性，對於染料廢水之處理技術，以高級氧化程序處理，具有能夠快速促使染料廢水脫色，並且有效達到礦化之效果，以利後續的處理程序。
染整業中常使用不同之染料，染料的使用提升了物質的經濟價值及滿足人們視覺上的感觀享受，卻也同時帶來了環境污染問題，其中偶氮染料的使用，約佔所有染料之50 %。本研究係利用UV/TiO2程序，進行偶氮染料之降解實驗，以Acid Orange 7 (酸性染料)及Reactive Red 2 (反應性染料)為目標污染物，探討水溶液酸鹼度、染料濃度及二氧化鈦添加量，在降解程序中各自所扮演角色之影響，最後並探討雙成分染料之分析。由實驗結果發現本實驗染料皆且具有二種形式，而該二種形式互為可逆反應。不照光吸附實驗顯示，TiO2對染料的吸附能力會隨著溶液酸度增加而提高，而與反應時間長短無關。由UV/TiO2系統實驗結果得知，染料色度去除率會隨著TiO2的添加量增加而增加，光催化效率並未因遮蔽效應而降低；然而隨著染料初始濃度增加，其光催化效率會隨之降低。在雙成分染料分析部分，運用將吸光度作一階微分的方式可處理雙成分染料定量的問題。

關鍵字

二氧化鈦，光觸媒，偶氮染料，雙成分染料

並列摘要

Dye-containing wastewater is a potential hazard of the environmental contamination. The characteristics of the dye pollutants are with high residual hues, with high chemical oxygen demand (COD), and difficult in decolorization and degradation by the bio-treatment. In the development of the technologies on the wastewater treatment, the advanced photochemical oxidation process is an effective solution to reduce the color and mineralize the dye-containing wastewater.
Among the dyes used in the dyeing industries, most parts, approximately 50 %, are azo compounds. And the azo-based dyes are concerned as the important environmental pollutants because they are suspected to be carcinogenic danger. Therefore, in this paper, it was used UV/TiO2 photocatalyic treatment process to investigate the properties of the degradation and decolorization for the Acid Orange 7 (AO7) and the Reactive Red 2 (RR2) dyes. The effect of parameters, such as pH, initial dye concentration, and TiO2 concentration was examined. Finally, the behavior of degradation for the binary-component dye mixtures was also checked. For the single component dye system, it is observed that the chemical form will be changed under different pH and the transition is reversible. The pH of the solution plays an important role on the degradation behavior in the TiO2 adsorption process. It is found that the adsorption of dyes on TiO2 increases with the solution acidity and is independent of reaction time. For the effect of TiO2 dose in UV/TiO2 degradation process, results show that the decolorization rate increases with TiO2 concentration and no screening effect was found. However, the increasing of the initial dye concentration results in the reduction of UV/TiO2 photocatalyic efficiency. In additions, for the binary dye mixtures, the study shows the first-order-differential absorption method can successfully analyze the quantities of dyes respectively and the decomposition rate therefore can be determined.

並列關鍵字

titanium dioxide , photocatalyst, azo dye, binary dye mixtures

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