摘要
在一个阳极为形稳阳极(DSA)的分隔的流经式电化学反应器中,利用原位电生成活性氯对活性艳蓝KN-R模拟废水进行氧化降解.在恒电位模式下,分别以592nm、255nm波长处的吸光度为主要指标,对该种染料的脱色及其芳环结构的氧化降解进行了对比分析.实验结果表明,在一定实验条件下,经4h的电解,可使染料100%脱色,同时40%左右的染料芳环结构被破坏;阳极电位、氯化钠浓度、染料浓度、电解液pH值对染料的脱色及其芳环结构的氧化降解有较强的影响,而温度和支持电解质浓度影响较小;在整个电氧化过程中,电解液未发生明显的矿化.在本实验条件下,间接电氧化在染料的氧化脱色降解过程中起主导作用,而直接电氧化作用不明显.
The electrochemical oxidation of C. I. Reactive Blue 19 with in situ electrogenerated active chlorine was carried out in a divided flow-by cell using metallic oxide coatings （DSA） as anode. At a constant potential, measurements of the absorbance at 592 nm and 255 nm were used to follow the discoloration of the dye and degradation of its aromatic ring. The experimental results suggested that the discoloration and degradation were strongly affected by electrode potential, initial pH, concentration of dye and NaCl, while slightly affected by supporting electrolyte concentration and temperature. After 4 h electrolysis at an electrode potential of 1.13 V（vs SCE）, for a simulated wastewater composed of 0. 5 mol · L^-1 NaCl, 0.1 mol · L^-1 Na2SO4, 0.1 mmol · L^-1 dye, the diseoloration of the dye and degradation efficiencies of its aromatic ring were 100%, ca. 40%, respectively, while no obvious change of TOC was observed. Indirect electrooxidation by using electrogenerated active chlorine was predominant in the electrochemical oxidation.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2005年第8期1552-1558,共7页
CIESC Journal
关键词
电化学氧化
活性氯
蒽醌染料
恒电位
electrochemical oxidation
active chlorine
anthraquinone dye
constant potential
作者简介
杨蕴哲（1965-），男，副教授。
联系人：杨凤林．
