3D-printed highly ordered Ti networks-based boron-doped diamond: An unprecedented robust electrochemical oxidation anode for decomposition of refractory organics

Li, Haichao; Yang, Wanlin; Ma, Li; Liu, Guoshuai; Yu, Yue; Cao, Jun; Zhu, Ruitong; Chen, Wei-Peng; Yu, Zhaoju; Long, Hangyu; Zhou, Kechao; Wei, Qiuping

doi:10.1016/j.cej.2021.131479

Cited by 32 publications

(8 citation statements)

References 54 publications

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“…Furthermore, modification of the reactor configuration and/or anodic geometry can be used to enhance the mass transfer to the anode. For example, employing flow-through reactors, 3D porous anodes, or flow/suspension anodes can be used to increase the mass transfer as reported in various earlier studies. ,− …”

Section: Environmental Implicationsmentioning

confidence: 99%

Kinetic Modeling of the Anodic Degradation of Ni-EDTA Complexes: Insights into the Reaction Mechanism and Products

et al. 2023

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In this study, an electrochemical advanced oxidation process (EAOP) was employed to effectively degrade complexes of nickel and ethylenediaminetetraacetic acid (EDTA) present in electroless nickel plating wastewaters. Our results show that Ni-EDTA complexes can be effectively degraded by an EAOP with degradation of the complexes occurring at/near the anode surface via interaction with hydroxyl radicals generated on water splitting. Our results further show that the rate of Ni-EDTA degradation is not a function of the rate of any particular chemical reaction but, rather, is controlled by the rate of transport of Ni-EDTA to the anode surface. The oxidation of EDTA to smaller noncomplexing entities releases Ni 2+ , which is subsequently deposited onto the cathode as Ni 0 . While complete Ni-EDTA removal and Ni recovery are achieved within 2 h, the overall TOC removal by EAOP is limited, with only 50% TOC removal achieved after 2 h of treatment. The low affinity of small molecular weight EDTA degradation products (such as formic acid, glycine, oxamic acid, and acetic acid) for the anode surface limits oxidation of these compounds and overall TOC removal by the anodic oxidation process. We have developed a mathematical kinetic model that satisfactorily describes Ni-EDTA removal, Ni recovery, and TOC removal over a range of Ni and EDTA concentrations and provides a good description of the oxidation of various EDTA degradation intermediates. The mathematical model developed here, when coupled with the hydrodynamics of the electrochemical cell using a computational fluid dynamics tool, can assist in both cell design and the selection of operating parameters such that the performance of the EAOP process for Ni-EDTA degradation and TOC removal is optimized.

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Section: Environmental Implicationsmentioning

confidence: 99%

Kinetic Modeling of the Anodic Degradation of Ni-EDTA Complexes: Insights into the Reaction Mechanism and Products

et al. 2023

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“…The SEM of the structure surface at different magnifications is shown in Figure S1. By scanning the dashed line area, the clear and uniform grains were observed with an average size of approximately 5 μm and the morphology of the as-prepared diamond film was compact and no cracks were observed on the diamond surface, which is beneficial for water oxidation on the BDD surface …”

Section: Resultsmentioning

confidence: 99%

“…The diamond layer was grown under a pressure of 3.0 kPa, and the temperature of the tungsten wire and substrate was maintained at 2300 and 800 °C for 10 h, respectively. Other details can be found in our previous work . The BDD working electrode was cleaned by several cycles of voltammetric scans in 0.25 M H 2 SO 4 from 0 up to 2.8 V. And after cleaning, the surface BDD electrode was washed by ultrasonication with ultrapure water.…”

Section: Methodsmentioning

confidence: 99%

“…Other details can be found in our previous work. 20 The BDD working electrode was cleaned by several cycles of voltammetric scans in 0.25 M H 2 SO 4 from 0 up to 2.8 V. And after cleaning, the surface BDD electrode was washed by ultrasonication with ultrapure water.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…By scanning the dashed line area, the clear and uniform grains were observed with an average size of approximately 5 μm and the morphology of the as-prepared diamond film was compact and no cracks were observed on the diamond surface, which is beneficial for water oxidation on the BDD surface. 20 To study the crystal structure of the as-prepared BDD material, the XRD measurement was performed. The XRD patterns for the BDD anode film (Figure S2a) with the characteristic peaks that were indexed to the typical diamond phase (JCPDS no.…”

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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Insight into the design of a Ti3C2 MXene/Ti4O7 composite ceramic membrane boosts the electrocatalytic activity for 1,4-dioxane electro-oxidation

Tang

et al. 2023

Applied Catalysis B: Environmental

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3D-printed highly ordered Ti networks-based boron-doped diamond: An unprecedented robust electrochemical oxidation anode for decomposition of refractory organics

Cited by 32 publications

References 54 publications

Kinetic Modeling of the Anodic Degradation of Ni-EDTA Complexes: Insights into the Reaction Mechanism and Products

Kinetic Modeling of the Anodic Degradation of Ni-EDTA Complexes: Insights into the Reaction Mechanism and Products

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

Insight into the design of a Ti3C2 MXene/Ti4O7 composite ceramic membrane boosts the electrocatalytic activity for 1,4-dioxane electro-oxidation

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