Mn2+协同PDS对酸性蓝80的电催化降解性能研究

李冬梅; 刘君扬; 徐歌; 冯力; 林显增; 李绍秀; 喻子真

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中国环境科学 ›› 2020, Vol. 40 ›› Issue (6) : 2464-2472.

水污染与控制

Mn²⁺协同PDS对酸性蓝80的电催化降解性能研究

李冬梅¹, 刘君扬¹, 徐歌², 冯力¹, 林显增³, 李绍秀¹, 喻子真⁴

作者信息 +

The study on electrocatalytic degradation performance of collaborative system of Mn²⁺ and PDS on Acid Blue 80

LI Dong-mei¹, LIU Jun-yang¹, XU Ge², FENG Li¹, LIN Xian-zeng³, LI Shao-xiu¹, YU Zi-zhen⁴

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摘要

以酸性蓝80（AB80）模拟染料废水，采用E-Mn²⁺-PDS协同体系，对AB80进行电催化降解实验.对比了不同催化体系的降解效率，探讨了Mn²⁺与PDS浓度、pH值和电流密度等单因素对E-Mn²⁺-PDS体系电催化降解效率的影响，对E-Mn²⁺-PDS体系中的氧化性物质、AB80的分解产物及其在体系中的矿化程度进行了研究，并分析了降解机理.结果表明：与其他催化体系比较，E-Mn²⁺-PDS协同体系最优，对AB80的降解率高达99.9%.pH值是最主要的影响因素，pH=3时，E-Mn²⁺-PDS协同体系的降解率为99.6%；协同体系中的氧化性物质包括硫酸根自由基（SO₄^-×），羟基自由基（HO×），还有活性Mn³⁺；AB80在协同体系中经过多种化学反应形成11种主要分解产物.协同体系对AB80的矿化率是直接电催化的2.6倍；降解机理为：PDS被Mn²⁺与电流激发出SO₄^-×后，SO₄^-×与水反应生成HO×，然后HO×与电流将Mn²⁺氧化为活性Mn³⁺，三种氧化性物质协同降解污染物.

Abstract

The present study was envisaged to study the electrocatalytic degradation of Acid Blue 80(AB80) using an electrocatalytic collaborative system (E-Mn²⁺-PDS). The degradation efficiencies of different catalytic systems were compared, and the effect of factors such as Mn²⁺ concentration, PDS concentration, pH value and current density on the degradation efficiency of E-Mn²⁺-PDS collaborative system was explored. In addition, the oxidizing substances, decomposition products of AB80 and its degree of mineralization in the system were investigated, and the mechanism of degradation was elucidated. It was found that the degradation rate of E-Mn²⁺-PDS collaborative system on AB80 reached 99.9% in 45 min. pH was found to significantly affect the E-Mn²⁺-PDS collaborative system. When pH=3, the degradation rate of E-Mn²⁺-PDS reached 99.6%. The oxidizing substances in the E-Mn²⁺-PDS system included SO₄^-×, HO×, and active Mn³⁺. In the E-Mn²⁺-PDS collaborative system, AB80 underwent a series of reactions, which produced 11major decomposition products. Additionally, the mineralization rate of E-Mn²⁺-PDS system was 2.6 times that of the direct electrocatalysis in 6 hours. The degradation mechanism was found to be the production of SO₄^-×by Mn²⁺ and the current from PDS, which subsequently reacted with water to generate HO×,this HO×oxidized the Mn²⁺ to oxidizedactive Mn³⁺ in the current, and the three different oxidizing species degraded the pollutants together.

导出引用

李冬梅, 刘君扬, 徐歌, 冯力, 林显增, 李绍秀, 喻子真. Mn²⁺协同PDS对酸性蓝80的电催化降解性能研究[J]. 中国环境科学. 2020, 40(6): 2464-2472

LI Dong-mei, LIU Jun-yang, XU Ge, FENG Li, LIN Xian-zeng, LI Shao-xiu, YU Zi-zhen. The study on electrocatalytic degradation performance of collaborative system of Mn²⁺ and PDS on Acid Blue 80[J]. China Environmental Science. 2020, 40(6): 2464-2472

中图分类号： X703

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