摘要
为解决水中偶氮染料难降解的问题,构建了电-高锰酸钾-过一硫酸盐体系(E-PM-PMS体系),以活性黄K-RN为目标偶氮染料,考察了 PM浓度、PMS浓度、电流密度、初始pH、水体背景对活性黄K-RN降解的影响.结果表明,E、PM、PMS之间有明显的协同作用.在PM浓度为0.8 mmol·L-1、PMS浓度为1 mmol·L-1、电流密度为26.29 mA·cm-2、初始pH为6、硫酸钠浓度为50 mmol·L-1的条件下,反应20 min对活性黄K-RN的降解率为95.8％,反应120 min对活性黄K-RN的矿化率为47.96％.电子自旋共振(ESR)测试证明,E-PM-PMS体系在降解活性黄K-RN的过程中产生了 SO4-、OH、1O2和O2等活性氧物种,E-PM-PMS体系降解活性黄K-RN是以自由基为主导的降解过程.此外,考察了 E-PM-PMS体系对不同染料有显著的降解效果.该研究提出的E-PM-PMS体系为偶氮染料的降解提供了理论依据和技术参考.
Abstract
The electro-potassium permanganate-peroxymonosulfate(E-PM-PMS)process was constructed to address the challenge of the recalcitrant degradation of azo dyes in water.In this study,Reactive Yellow 3 azo dye was as the degradation target,and the effects of PM concentration,PMS concentration,current density,initial pH,and aqueous background were investigated,the results indicated a clear synergistic effect between E,PM,and PMS.The degradation rate of Reactive Yellow 3 after 20 minutes of reaction was 95.8％,and the mineralization rate of Reactive Yellow 3 after 120 minutes of reaction was 47.96％,under the experimental conditions:PM concentration was 0.8 mmol·L-1,PMS concentration was 1 mmol·L-1,current density was 26.29 mA·cm-2,initial pH was 6,and Na2SO4 concentration was 50 mmol·L-1.Moreover,the E-PM-PMS process produced reactive oxygen species,including SO4·-,OH,1O2,and·O2-,which was detected by the electron spin resonance(ESR)test.The main drivers of degradation of Reactive Yellow 3 were free radicals in the E-PM-PMS process.In addition,the significant effects was shown by degrading various dyes in the E-PM-PMS process.The proposed E-PM-PMS process offers a theoretical foundation and technical guidance for the degradation of azo dyes.
维普
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