恒电位下电氧化脱色降解酸性橙Ⅱ

采用恒电位模式,在有阳离子交换膜分隔的两室电解槽中以RuO2/Ti阳极对酸性橙Ⅱ进行氧化脱色降解。分别以484 nm、310 nm、255 nm波长处的吸收值为指标,跟踪脱色降解过程。脱色反应符合准一级动力学,表观反应速率常数分别与阳极电位、氯化钠浓度、染料初始浓度之间存在指数函数关系、线性关系和倒数函数关系。氯化钠浓度为40 mmol/L时,染料100%脱色,萘环结构受到一定程度破坏,染料未发生明显矿化。间接电氧化在脱色降解过程中起主导作用,直接电氧化起一定作用。

Electrochemical oxidation of Acid Orange Ⅱ under potentiostatic model

The electrochemical oxidation of Acid Orange II was carried out potentiostatically in a two-compartment cell separated by cation exchange membrane using RuO_2/Ti as anode.The absorbances at 484 nm,310 nm and 255 nm were measured to follow the decoloration of the dye.The result shows that the decolorization follows the pseudo first order kinetics.The reaction rate constants are related to the electrode potential,NaCl concentration and initial dye concentration by exponential function,linear relationship and reciprocal function respectively.Furthermore,the decoloration rate is reduced obviously by high temperature.The color removal ratio can reach 100% when NaCl is 40 mmol/L,meanwhile the naphthalene ring is destroyed in a certain extent,and no obvious(mineralization) of the dye occurrs.Indirect electrooxidation predominates in the process compared with the direct one.