恒电流模式下电氧化脱色降解酸性橙Ⅱ  

Electrochemical oxidation of Acid Orange II under galvanostatic model

作　　者：杨卫身[1] 樊瑞 

机构地区：[1]福建工程学院环境与设备工程系,福建福州350108 [2]麦凯乐大连总店总经办,辽宁大连116001

出　　处：《福建工程学院学报》2010年第4期367-374,共8页Journal of Fujian University of Technology

摘　　要：采用恒电流模式,在有阳离子交换膜分隔的两室电化学反应器中以形稳阳极(DSA)对偶氮染料酸性橙II进行氧化脱色降解。分别以484 nm、310 nm、255 nm波长处的吸收值为主要指标,跟踪染料的脱色降解。脱色反应过程符合零级动力学,反应速率常数分别与电流密度、氯化钠浓度、染料初始浓度正线性相关,与温度负线性相关,与支持电解质硫酸钠浓度存在倒数函数关系;高pH值明显降低脱色降解反应速率。氯化钠浓度40 mmol.L-1时,经7 h电解,染料100%脱色,染料中的萘环结构受到一定程度的破坏,染料未发生明显矿化。间接电氧化在染料的脱色降解过程中起主导作用,直接电氧化起一定作用。The electrochemical oxidation of Acid Orange Ⅱ was carried out galvanostatically in a twocompartment cell separated by a cation exchange membrane using metallic oxide coatings as anode.The absorbances at 484 nm,310 nm and 255 nm were measured to monitor the decoloration of the dye.The decolorization followed the zero order kinetics.The reaction rate constants were linearlly correlated to the current density,NaCl concentration,initial dye concentration,and was negatively correlated to temperature（by linear relationship） while a reciprocal function existed between the rate constant and the support electrolyte Na2SO4 concentration.Furthermore,the decoloration rate was obviously reduced by high pH.The color removal rate reached 100% in 7 hours when NaCl was 40 mmol/L,meanwhile the naphthalene ring was destroyed to a certain extent without occurrence of obvious mineralization of the dye.Indirect electrooxidation predominated in the process compared with the direct one.

关 键 词：电化学氧化 偶氮染料 恒电流 脱色 

分 类 号：X703.1[环境科学与工程—环境工程]