Reactive black 5 dyeing wastewater treatment by electrolysis-Ce (IV) electrochemical oxidation technology: Influencing factors, synergy and enhancement mechanisms
Reactive black 5 dyeing wastewater treatment by electrolysis-Ce (IV) electrochemical oxidation technology: Influencing factors, synergy and enhancement mechanisms
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DOI：
10.1016/j.seppur.2021.120314
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发表时间：
2021-12
影响因子：
8.6
通讯作者：
Li Feng;Jiajun Liu;Z. Guo;Tingyu Pan;Jiahao Wu;Xuhao Li;Bingzhi Liu;Huaili Zheng
中科院分区：
文献类型：
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作者：
Li Feng;Jiajun Liu;Z. Guo;Tingyu Pan;Jiahao Wu;Xuhao Li;Bingzhi Liu;Huaili Zheng
活性黑5（RB 5）染色废水对水环境安全和生物生命健康构成严重威胁。采用强化型电解-Ce（IV）电化学氧化技术对RB 5印染废水进行高效处理具有重要意义。研究了电解-Ce（IV）体系中Ce离子浓度、pH、电流值、不同催化体系等单因素实验条件对RB 5降解效果的影响。实验结果表明，直接电化学氧化法与Ce（IV）单独处理具有显著的协同增效作用，两者联合（电解-Ce（IV））处理可显著强化RB 5处理，去除率可达91.6%。此外，背景离子HCO 3-、Cl-、PO 43-和HA对电解-Ce（IV）体系有抑制作用，而Cl-则有增强作用。同时，在电解Ce（IV）中实现了去除RB 5的合理能量消耗，最大每订单电能（EE/O）值为4.89 kWh·m−3。RB 5降解有三种可能的反应途径，生成的有机中间体分子量小，具有生物毒性，有利于产物的进一步矿化和生物降解。在电解-Ce（IV）体系中，直接电化学氧化作用、Ce（IV）离子和羟基自由基是RB 5氧化去除的驱动力，其中直接电化学氧化作用和Ce（IV）离子是RB 5去除的关键和主导作用。与单独的直接电化学氧化体系相比，电解-Ce（IV）体系中的Ce（IV）对RB 5的降解有很大的促进和改善作用，是RB 5降解的关键和核心活性物质。
Reactive black 5 (RB5) dyeing wastewater poses a serious threat to the water environment safety and biological life health. It is of great significance to use an enhanced type of electrolysis-Ce(IV) electrochemical oxidation technology for the efficient treatment of RB5 dyeing wastewater. In this study, the effects of single-factor experimental conditions such as cerium (Ce) ion concentration, pH, current value, different catalytic systems on RB5 degradation effect in electrolysis-Ce(IV) system were investigated. The experimental results showed a significant synergistic and enhanced effect between the direct electrochemical oxidation process and Ce(IV) treatment alone, and their combination (electrolysis-Ce(IV)) could significantly enhance the RB5 treatment with a removal efficiency up to 91.6%. In addition, the background ions HCO3−, Cl−, PO43−and HA had an inhibitory effect on the electrolysis-Ce(IV) system, whereas Cl−had an enhanced effect. Meanwhile, reasonable energy consumption for the removal of RB5 was achieved in electrolysis-Ce(IV) with a maximum electrical energy per order (EE/O) value of 4.89 kWh·m−3. There are three possible reaction ways for RB5 degradation, and the generated organic intermediates with low molecular weight and biotoxicity, which facilitates further mineralization of the product and biodegradation. In the electrolysis-Ce(IV) system, the driving force for the oxidative removal of RB5 were direct electrochemical oxidation function, Ce(IV) ions and hydroxyl radicals, where direct electrochemical oxidation function and Ce(IV) ions were the key and dominant effect for RB5 removal. Compared with the direct electrochemical oxidation system alone, the Ce(IV) in the electrolysis-Ce(IV) system contributes much to enhancing and improving the RB5 degradation and is the key and core active degradation substance.