Study on the performance efficiency, mechanism, power consumption and biochemical properties of E/Ce(IV)/PMS on the enhanced removal of RB19.
Study on the performance efficiency, mechanism, power consumption and biochemical properties of E/Ce(IV)/PMS on the enhanced removal of RB19.
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DOI：
10.1016/j.envres.2023.116271
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发表时间：
2023-06
影响因子：
8.3
通讯作者：
Jiajun Liu;Xionghao Zhang;Junda Li;Li Feng;Shuai Han;Tingyu Pan;Taiheng Zhang;Shenyuh Wu
中科院分区：
文献类型：
--
作者：
Jiajun Liu;Xionghao Zhang;Junda Li;Li Feng;Shuai Han;Tingyu Pan;Taiheng Zhang;Shenyuh Wu
本研究建立了一种E/Ce（IV）/PMS协同高级氧化工艺（E/Ce（IV）/PMS）对活性艳蓝19（RB 19）的高效去除。考察了不同耦合体系的催化氧化性能，证实了E/Ce（IV）与PMS在体系中的协同作用。在E/Ce（IV）/PMS体系中，RB 19的氧化去除效果良好，去除率达到94.47%，能耗合理（EE/O值为3.27 kWh·m−3）。考察了pH、电流密度、Ce（IV）浓度、PMS浓度、RB 19初始浓度和水体基质对RB 19去除率的影响。此外，淬灭和EPR实验表明，溶液中含有SO 4·−、HO·2和1 O2等不同的自由基，其中1 O2和SO 4·−起着关键作用，而HO·2的作用较弱。Ce离子捕集实验证实Ce（IV）参与了反应过程并起主要作用（29.91%）。RB 19经过3种可能的降解途径，其中间产物具有良好的生物化学性质。最后，对RB 19的降解机理进行了探讨。在电流存在下，E/Ce（IV）/PMS进行快速的Ce（IV）/Ce（III）循环，连续产生强催化氧化Ce（IV），PMS分解产生的活性自由基与Ce（IV）和直接电氧化结合，有效地破坏了RB 19的分子结构，表现出高效的去除率。
In this study, an advanced oxidation process with E/Ce(IV) synergistic PMS (E/Ce(IV)/PMS) was established for the efficient removal of Reactive Blue 19 (RB19). The catalytic oxidation performance of different coupling systems was examined and the synergistic effect of E/Ce(IV) with PMS in the system was substantiated. The oxidative removal of RB19 in E/Ce(IV)/PMS was excellent, achieving a removal efficiency of 94.47% and a reasonable power consumption (EE/O value was 3.27 kWh·m−3). The effect of pH, current density, Ce(IV) concentration, PMS concentration, initial RB19 concentration and water matrix on the removal efficiency of RB19 were explored. Additionally, quenching and EPR experiments showed that the solution contains different radicals such as SO4·−, HO∙ and1O2, where1O2and SO4·−played key roles, but HO∙ just acted a weaker role. Ce ion trapping experiment confirmed that Ce(IV) was involved in the reaction process and played a major role (29.91%). RB19 was subject to three possible degradation pathways, and the intermediate products displayed well biochemical properties. To conclude, the degradation mechanism of RB19 was explored and discussed. In the presence of current, E/Ce(IV)/PMS performed a rapid Ce(IV)/Ce(III) cycle, continuously generating strong catalytic oxidation Ce(IV), The reactive radicals derived from the decomposition of PMS, in conjunction with Ce(IV) and direct electro-oxidation, efficiently destroyed the molecular structure of RB19 and showed an efficient removal rate.