Ce（Ⅳ） fixator electrochemical oxidation technology for enhanced treatment of reactive black 5 dyeing wastewater

doi:10.19965/j.cnki.iwt.2021-0593

Abstract

Abstract:

The discharge of reactive black 5（RB5） dyeing wastewater poses a serious threat to the safety of water environment and health of biological life. A novel and efficient electro?Ce（Ⅳ） mediator electrochemical oxidation technology was used to treat RB5 dyeing wastewater. The degradation effect of different systems were discussed. The effects of cerium ion concentration，electrolyte concentration，initial pH and current on the degradation effect of RB5 and its degradation mechanism in electro?Ce（Ⅳ） system were investigated. The experimental results showed that there was a significant synergistic effect between the direct electrochemical oxidation and Ce（Ⅳ） treatment，and the combination of the two〔electro?Ce（Ⅳ）〕 could significantly enhance the removal of RB5 with a removal efficiency of up to 91.6%. In addition，the background ions HCO₃^-，PO₄^3- and HA in the dyeing wastewater had an inhibitory effect on the electro?Ce（Ⅳ） system，whereas Cl^- had a facilitating effect. In the electro?Ce（Ⅳ） system，the driving force for RB5 removal were direct electrocatalysis，Ce（Ⅳ） oxidation and hydroxyl radical oxidation，and direct electrocatalysis and Ce（Ⅳ） oxidation were the key and dominant effect for RB5 removal. Ce（Ⅳ） in electro?Ce（Ⅳ） system was the key and core active degradation substance.

Key words: reactive black 5, dyeing wastewater, medium oxidation, background ions, Ce（Ⅳ）, free radicals

摘要：

活性黑5（RB5）染料废水的排放对环境安全和生物生命健康构成严重威胁。采用新型高效电?Ce（Ⅳ）介体电化学氧化技术处理RB5染料废水，探讨了不同体系的处理效果，并利用单因素实验研究了铈离子浓度、电解质浓度、初始pH、电流等对降解效果的影响，以及电?Ce（Ⅳ）体系降解RB5的机理。实验结果表明，直接电化学氧化和单独的Ce（Ⅳ）之间存在明显的协同作用，二者的结合可显著增强对RB5的去除效果，RB5去除率高达91.6%。染料废水背景离子HCO₃^-、PO₄^3-和HA对电?Ce（Ⅳ）体系有抑制作用，而Cl^-则有促进作用。电?Ce（Ⅳ）体系去除RB5的动力为直接电催化、Ce（Ⅳ）氧化和羟基自由基氧化，其中直接电催化和Ce（Ⅳ）氧化起主要作用，Ce（Ⅳ）是最主要的活性降解物质。

关键词: 活性黑5, 染料废水, 介体氧化, 背景离子, Ce（Ⅳ）, 自由基

CLC Number:

X788

Xuhao LI,Jiahao WU,Haoming SONG,Xianlun HUANG,Zizeng WANG,Bingzhi LIU,Li FENG. Ce（Ⅳ） fixator electrochemical oxidation technology for enhanced treatment of reactive black 5 dyeing wastewater[J]. Industrial Water Treatment, 2022, 42(3): 62-69.

李栩灏,吴嘉豪,宋浩明,黄羡伦,王梓增,刘冰枝,冯力. Ce（Ⅳ）介体电化学氧化技术处理活性黑5染料废水[J]. 工业水处理, 2022, 42(3): 62-69.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0593

https://www.iwt.cn/EN/Y2022/V42/I3/62

Figures/Tables 11

Fig. 1 Experimental equipment

Fig.2 Treatment effects of different systems on RB5

Fig. 3 Effect of current on RB5 removal

Fig. 4 The effect of Na₂SO₄ concentration on the RB5 removal

Fig. 5 The effect of Ce（Ⅳ） concentration on the RB5 removal

Fig. 6 The effect of pH on the RB5 removal

Fig. 7 Effect of initial concentration of RB5 on RB5 removal

Fig.8 Effect of HCO₃^-（a），PO₄^3-（b），Cl^-（c） and HA（d） on RB5 removal

Fig. 9 Effect of heavy metal chelating agent TMT-15 on RB5 removal

Fig.10 The effect of Me and TBA on RB5 removal （a） and analysis of free radical（b）

Fig. 11 Electro?Ce（Ⅳ） fixator electrochemical reaction mechanism

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