| Summary: | 碩士 === 逢甲大學 === 環境工程與科學所 === 95 === In recent year, accompanied with industrial development, a variety of man-made synthetic dyes have been produced and used as colored substance. Among them, Sudan I and Sudan II, two types of azo dye, are also most commonly used as food colorant. However, these dyes are banned in many countries for they might trigger occurrence of cancer as food colorant. Under green technology idea, to provide a safer, less toxically, and reduce impacts to environment, the green chemicals or chemical process is more and more important. Room temperature ionic liquids (RTILs) substitute for organic solvent in liquid-liquid extraction therefore is well developed, for their superior characteristics with scarcely volatile, hard to flame, and less toxicity for human, make them popular.
In this study, mainly discuss were focused on the removal efficiency of Sudan I and Sudan II dyes in aqueous phase by Ionic liquids ([bmpl][Tf2N] and [bmim][PF6]). The experimental parameters of the study includes: pH of aqueous phase, dye concentration, water to ionic liquid extraction ratio, and types of ionic liquids used.
After extraction of Ionic liquid to Sudan dyes which dissolve in 40% sulfuric acid aqueous solution, the experimental results observed that a hydrolytic process of [bmim][PF6] was occurred, but not for [bmpl][Tf2N]. When the extraction ratio of Sudan I and Sudan II to ionic liquids ([bmim][PF6] and [bmpl][Tf2N]) was 10:1(v/v), the extraction efficiency were 99.6% and 98.5%, respectively. While the extracted ratio of water to [bmim][PF6] were 50:1(v/v) and 100:1(v/v), the ionic liquid was completely dissolve into sulfuric acid aqueous solution. The results of extraction of Ionic liquid to Sudan dyes dissolve in sodium hydroxide aqueous solution also investigated. The results indicated that except for the extracted ratio of aqueous Sudan dyes to [bmim][PF6] were 100:1(v/v), the extraction efficiency of other ratios of aqueous to the ionic liquid were around 84~99%.
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