活性炭纤维电极上苋菜红的恒电位电化学脱色

ZHOU Yanwei; FAN Li; YANG Weishen; YANG Fenglin

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活性炭纤维电极上苋菜红的恒电位电化学脱色

更新时间：2025-12-10

- 活性炭纤维电极上苋菜红的恒电位电化学脱色
- CIESC Journal Issue 10, (2006)
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- Online First：25 October 2006，
  
  Published：25 October 2006
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ZHOU Yanwei, FAN Li, YANG Weishen, et al. 活性炭纤维电极上苋菜红的恒电位电化学脱色[J]. CIESC Journal, 2006, (10).
DOI：

ZHOU Yanwei, FAN Li, YANG Weishen, et al. 活性炭纤维电极上苋菜红的恒电位电化学脱色[J]. CIESC Journal, 2006, (10). DOI：

摘要

在恒电位模式下，采用隔膜电解槽，分别以活性炭纤维（ACF）为阳极或阴极，研究了偶氮染料苋菜红的脱色行为.测量了ACF的线性扫描极化曲线，进行了控电位下苋菜红在ACF电极上的整体电解，考察了脱色率、TOC和COD去除率同电极电位之间的关系.结果表明：（1）苋菜红在ACF上的氧化电位和还原电位分别为0.6 V和-0.2 V;（2）当电极电位为-0.1～0.5 V时，脱色源于染料在ACF上的吸附，且不受极化的影响;（3）当电极电位为-0.2～-0.8 V时，脱色以染料的电还原为主，反应遵循准一级动力学，脱色速率常数与电极电位线性相关;TOC、COD去除率可达60%;（4）当电极电位为0.6～1.4 V时，脱色以染料的电氧化为主，反应同样遵循准一级动力学;TOC、COD去除率一般在30%左右.

Abstract

Under potentiostatic mode，the decolorization behavior of amaranth was studied by using activated carbon fiber（ACF）as anode or cathode in a two-compartment cell separated by cation exchange membrane from -0.8 V to 1.4 V（vs SCE）.The relationships between color/TOC/COD removal and potential were investigated.The use of ACF electrode was successful in removing the color，TOC and COD within a proper potential range.The oxidation and reduction potentials of amaranth on ACF electrode were 0.6 V and -0.2 V

respectively.In the range of -0.1—0.5 V，the decolorization resulted from adsorption of amaranth on ACF，and adsorption behavior was scarcely affected by the potential.In the range of -0.2—-0.8 V，the electroreduction of amaranth played an important role in decolorization and followed pseudo-first order kinetics，and the rate constant was a linear function of the potential.TOC，COD were removed by 60% approximately.In the range of 0.6—1.4 V，the electrooxidation of amaranth filled the role of decolorization and followed pseudo-first order kinetics too.About 30% of TOC，COD were removed.

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