Electro-activated persulfate oxidation of malachite green by boron-doped diamond (BDD) anode: effect of degradation process parameters

Miao, Dongtian; Liu, Guoshuai; Wei, Qiuping; Hu, Naixiu; Zheng, Kuangzhi; Zhu, Chengwu; Liu, Ting; Zhou, Kechao; Yu, Zhaoju; Ma, Li

doi:10.2166/wst.2020.176

Cited by 28 publications

(5 citation statements)

References 51 publications

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“…78-2500) . The diffraction peaks located at 44 and 75.5° were indexed to crystal planes (111) and (220), respectively, indicating that the (111) surface is the most exposed surface for the BDD film anode . In addition, Raman spectra reflect the carbon composition and doping degree of the BDD anode.…”

Section: Resultsmentioning

confidence: 99%

“…30 The diffraction peaks located at 44 and 75.5°were indexed to crystal planes ( 111) and ( 220), respectively, indicating that the (111) surface is the most exposed surface for the BDD film anode. 31 In addition, Raman spectra reflect the carbon composition and doping degree of the BDD anode. As shown in Figure S2b, the peaks of 501 and 1222 cm −1 reflect the phonon scattering due to the change of diamond structure by boron doping.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Electrochemical Removal of Ni–EDTA Mediated by Chlorine and Hydroxyl Radicals on BDD Anodes

Liu

Shao

et al. 2023

ACS EST Water

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As a highly reactive oxidative species, chlorine radicals (E Cl • 0 = 2.47 V vs standard hydrogen electrode, SHE) could react with carboxylic and amino group-containing organic matter efficiently. To this end, mechanistic insights into the reactive species (Cl • and • OH)-mediated Ni−EDTA decomposition were examined in depth. The used boron-doped diamond (BDD) anode could achieve remarkably enhanced decomposition of Ni−EDTA in NaCl electrolyte, indicated by the apparent reaction kinetics constant being 2.7 and 4 times that in the presence of Na 2 SO 4 and NaClO 4 , respectively. The experimental results and theoretical simulations revealed that the chlorine evolution reaction (CER) was thermodynamically favorable on the BDD anode, which facilitated the electro-generation of Cl • . Competitive kinetics and quenching experiments proved that the second-order rate constant of Cl • with Ni−EDTA is ∼1.38 × 10 10 M −1 s −1 , which is higher than that of • OH with Ni−EDTA (∼2.68 × 10 9 M −1 s −1 ). Furthermore, the experimental results and density functional theory (DFT) calculations show that the molecular changes of Ni−EDTA are mediated by Cl • and • OH through the H-abstraction and electron-transfer pathway in EDTA 4− . This study demonstrates positive implications in the electrochemical decomplexation of wastewater containing chlorine, which makes water treatment more effective, more economical, and much easier.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Electrochemical Removal of Ni–EDTA Mediated by Chlorine and Hydroxyl Radicals on BDD Anodes

Liu

Shao

et al. 2023

ACS EST Water

Self Cite

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“…In contrast, in many cases, pollutant oxidation is promoted under acidic pH conditions. ,,− For example, Fernandes et al demonstrated that EE/O for the treatment of concentrated sanitary landfill leachate by AO is lower at pH 2.98 than that at pH 8.2 (No. 11 in Table ).…”

Section: Performance Evaluation Of Eopsmentioning

confidence: 99%

Electrochemical Oxidation Processes for the Treatment of Organic Pollutants in Water: Performance Evaluation Using Different Figures of Merit

Lee

Seo

et al. 2022

ACS EST Eng.

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Electrochemical oxidation processes (EOPs) have gained attention as promising technologies for the removal of refractory organic pollutants in water and wastewater. Although many reviews have been reported on EOPs, to date, no review has been mainly focused on the energy efficiencies of EOPs. Accordingly, herein, EOPs for the treatment of organic pollutants in water and wastewater are reviewed, and the performances of different EOPs in terms of energy efficiencies are evaluated using various figures of merit. The basic principles of EOPs are briefly introduced, and indicators for the performance evaluation of EOPs are analyzed based on the fundamentals and statistical databases of EOPs obtained from the literature. Electrical energy per order (EE/O) and electrical energy per mass (EE/M) have been widely used to measure the energy efficiencies of EOPs. However, statistical analysis indicates that EE/O is a more suitable index in this regard than EE/M because it better represents the kinetics of pollutant degradation by EOPs, thereby mitigating the influence of the initial organic load on the performance evaluation of EOPs. EOPs modified using Fenton's reagent or external supplies of energy (or chemicals) exhibit higher energy efficiencies than those of anodic oxidation processes due to the existence of additional reactions or synergistic mechanisms for the generation of reactive oxidants. In addition to the evaluation of the energy efficiencies of different types of EOPs, the effects of electrode materials and electrolysis conditions, such as current density, pH, anions, and additive concentrations, on the energy efficiencies of EOPs are discussed. We believe that our review will provide useful information and insights for choosing the optimal types and conditions of EOPs for pollutant removal.

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“…However, the optimal voltage value was 5 V because the continued increase in voltage would cause more secondary reactions. 45 …”

Section: Degradation Experimentsmentioning

confidence: 99%

Enhancing the activation of persulfate using nitrogen-doped carbon materials in the electric field for the effective removal of p-nitrophenol

Tang

Zhang

2021

RSC Adv.

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Electro-activated persulfate oxidation of malachite green by boron-doped diamond (BDD) anode: effect of degradation process parameters

Cited by 28 publications

References 51 publications

Electrochemical Removal of Ni–EDTA Mediated by Chlorine and Hydroxyl Radicals on BDD Anodes

Electrochemical Removal of Ni–EDTA Mediated by Chlorine and Hydroxyl Radicals on BDD Anodes

Electrochemical Oxidation Processes for the Treatment of Organic Pollutants in Water: Performance Evaluation Using Different Figures of Merit

Enhancing the activation of persulfate using nitrogen-doped carbon materials in the electric field for the effective removal of p-nitrophenol

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