Ordered structures with functional units (OSFU) enabled highly robust diamond anode for electrochemical decomposing of organic pollutants

Wei, Qiuping; Liu, Guoshuai; Zhu, Chengwu; Zhou, Bo; Mei, Ruiqiong; Ma, Li; Zhang, Long; Yang, Wanlin; Ye, Wentao; Zhou, Kechao; Yu, Zhaoju

doi:10.1016/j.cej.2020.125465

Cited by 25 publications

(5 citation statements)

References 34 publications

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“…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 . The peak at 1327 cm –1 is assigned to the diamond sp 3 phase.…”

Section: Resultsmentioning

confidence: 94%

“…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. 32 The peak at 1327 cm −1 is assigned to the diamond sp 3 phase. The peak of Raman spectra at 1580 cm −1 is not obvious, which reflects the rare sp 2 phase carbon (graphite phase) in this material, which demonstrated that the obtained electrode was in a high-quality diamond phase.…”

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: 94%

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

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“…The standard B-doping characteristic peaks 42 , diamond phase and graphite phase characteristic peaks 43 are at 400 -600 cm -1 , 1332 cm -1 and 1580 cm -1 , respectively. The Raman spectrum is shown in Fig.…”

Section: Materials Characterisationmentioning

confidence: 99%

“…Meanwhile, B 2 H 6 reduces the etching of the graphite phase by atomic H, resulting in the growth of a large amount of amorphous and sp 2 phase carbon, which greatly reduces the quality of BDD films 41. The standard B-doping characteristic peaks,42 diamond phase and graphite phase characteristic peaks43 are at 400 -600 cm −1 , 1332 cm −1 and 1580 cm −1 , respectively. The Raman spectrum is shown in Fig.2b.…”

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confidence: 99%

The Effect of Boron Doping Concentration on the Electrochemical Oxidation of Chlorine Using BDD Electrode

Zhou

Yang

et al. 2023

J. Electrochem. Soc.

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Boron-doped diamond (BDD) electrode is an excellent candidate for anodic electrochemical oxidation of wastewater. However, higher concentrations of ClO3- and ClO4- of biotoxicity was found during chloride electrolysis using BDD electrodes compared to other electrode materials. In this study, BDD electrodes with five different boron doping concentrations were fabricated on silicon substrates using hot-filament chemical vapor deposition (HFCVD) method. The physical and electrochemical characterisation were conducted, which confirmed that with the decrease of boron concentration, the crystal size of the diamond decreased, oxygen evolution potential decreased, charge transfer resistance decreased while the electro-active surface area (EASA) increased. The electrochemical oxidation experiments of NaCl solution were carried out with these five BDD electrodes and time-dependent traces of product concentrations, current efficiencies and energy consumptions were compared and discussed. When the boron concentration increased, the minimum energy required to produce unit active chlorine (AC) decreased initially then increased, the same tendency was found in the yields of ClO3- and ClO4-. The lightly doped BDD (1.23 × 1020 cm-3) showed low energy consumption and high yield of AC, and low yields of ClO3- and ClO4-. Electrolysis of chlorine-containing organic wastewater was studied which further demonstrated the good performance of lightly doped BDD electrode.

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“…Thanks to the fluid flow channel, the 3D-BDD electrode exhibited highly efficient electrochemical oxidation of RB-19. The apparent reaction rate constant, energy consumption, and mineralization current efficiency (MCE) were 1.487 min -1 , 0.03 kWh (gTOC) -1 and 326%, respectively (electrolyte: 0.1 M Na2SO4 was 0.1 M; current was 0.3 A; 400 mg L -1 RB-19; time: 180 min) 3D-BDD electrodes prepared with different ppi (pores per inch) of Ni foam had different electro-oxidation performance[209]. The COD removal rate and energy consumption of 3D-BDD1 (50 ppi) were 1.5-time and 25% of that of 3D-BDD2 (35 ppi-30), respectively.…”

mentioning

confidence: 99%

Nanostructured electrodes for electrocatalytic advanced oxidation processes: From materials preparation to mechanisms understanding and wastewater treatment applications

Oturan

Zhou

et al. 2021

Applied Catalysis B: Environmental

135

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Ordered structures with functional units (OSFU) enabled highly robust diamond anode for electrochemical decomposing of organic pollutants

Cited by 25 publications

References 34 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

The Effect of Boron Doping Concentration on the Electrochemical Oxidation of Chlorine Using BDD Electrode

Nanostructured electrodes for electrocatalytic advanced oxidation processes: From materials preparation to mechanisms understanding and wastewater treatment applications

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