Unprecedented formation of reactive BrO– ions and their role as mediators for organic compounds degradation: The fate of bromide ions released during the anodic oxidation of Bromophenol blue dye

IF 2.9 Q2 ELECTROCHEMISTRY Electrochemical science advances Pub Date : 2022-09-04 DOI:10.1002/elsa.202100225
Camila Carvalho de Almeida, Soliu O. Ganiyu, Carlos A. Martínez-Huitle, Elisama Vieira dos Santos, Katlin Ivon Barrios Eguiluz, Giancarlo Richard Salazar-Banda
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引用次数: 1

Abstract

Based on the existing literature, active chlorine-mediated electrochemical oxidation has been extensively studied when Cl is added or Cl is already present in the water matrices, as well as when Cl is released from the target organic pollutants during their degradation. However, no attempts have been published concerning the fate and role of bromide (Br) ions released during the anodic oxidation (AO) of organobromine compounds. Therefore, the AO of bromophenol blue dye (BPB) was investigated in a parallel plate flow reactor using a boron-doped diamond (BDD) anode. The effect of the applied current on the color removal efficiency and mineralization of BPB solution was examined and compared with AO of phenol red (PR) which has a similar molecular structure to BPB (but without Br) in order to understand the role of Br heteroatoms on the mineralization of BPB. Faster and higher mineralization and discoloration were achieved when treated with BPB solution compared to PR under similar experimental conditions. This behavior was associated with the electrogeneration of BrO, from the heteroatom Br which is released as the bromide ion (Br), during the degradation of BPB. The active bromine species are formed via direct and indirect oxidation approaches which were proposed based on ion chromatography and linear scanning voltammetry analysis.

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活性溴离子的空前形成及其作为有机化合物降解介质的作用:溴酚蓝染料阳极氧化过程中释放的溴离子的命运
根据现有文献,当水中添加 Cl- 或已经存在 Cl- 时,以及当目标有机污染物在降解过程中释放出 Cl- 时,以氯为介质的活性电化学氧化作用已得到广泛研究。不过,目前还没有关于有机溴化合物阳极氧化(AO)过程中释放的溴离子(Br-)的归宿和作用的尝试。因此,我们在平行板流反应器中使用掺硼金刚石(BDD)阳极研究了溴酚蓝染料(BPB)的阳极氧化。研究了外加电流对 BPB 溶液脱色效率和矿化度的影响,并将其与分子结构与 BPB 相似(但不含 Br)的酚红(PR)的 AO 进行了比较,以了解 Br 杂原子对 BPB 矿化度的作用。在相似的实验条件下,与 PR 相比,用 BPB 溶液处理 BPB 时,矿化速度更快,褪色程度更高。这种行为与 BPB 降解过程中从杂原子 Br(以溴离子(Br-)的形式释放)电生成的 BrO- 有关。根据离子色谱法和线性扫描伏安分析法提出的直接和间接氧化方法形成了活性溴物种。
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CiteScore
3.80
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审稿时长
10 weeks
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