Bioelectrochemical system for dehalogenation: A review

Zhu, Xiuling; Wang, Xin; Li, Nan; Wang, Qi; Liao, Chengmei

doi:10.1016/j.envpol.2021.118519

Cited by 31 publications

(5 citation statements)

References 130 publications

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“…86 Later, our group verified that pH greatly affects the selectivity of 3,4,5,6-TeCP through changing the adsorption form of reactants on the catalyst. 41 At the same time, with the widespread use of halogenated products, the application of electrocatalytic dehalogenation in environmental field had raised great attention, 87,88 Several noble metals such as Pt, Pd, Au, and Ru exhibited the high electrocatalytic activity and selectivity in various dehalogenation reactions, followed by the bimetallic catalysts. [89][90][91][92][93] Jiang's research group studied the role of bimetallic nanocatalysts (AgPd) on the conversion of 2,4-dichlorophenol (2,4-DCP) to phenol (P).…”

Section: Electrocatalytic Reduction Dehalogenation Technologymentioning

confidence: 99%

Electrocatalytic dehalogenation in the applications of organic synthesis and environmental degradation

Zhao,

Yao,

Zhang

et al. 2024

EcoEnergy

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Electrocatalytic dehalogenation technology is a promising approach for the synthesis of chemicals (such as pesticides and pharmaceutical intermediates) and the disposal of halogenated organic pollutants. Compared with the traditional chemical reduction technology, the electrocatalytic reduction dehalogenation method has the advantages of high efficiency, controllable operation, and reduced secondary pollution. This review systematically consolidates the recent advances in the electrocatalytic dehalogenation in the application of organic synthesis and environmental degradation, focusing on the involved mechanisms, and influences factors (e.g., electrocatalysts, solution environment, and reaction conditions) on the performance of electrocatalytic dehalogenation. Furthermore, the latest characterization and analytical methods and the industrial application of electrocatalytic dehalogenation technology are summarized. Lastly, the existing challenges and perspectives are proposed for efficient electrocatalytic dehalogenation.

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Section: Electrocatalytic Reduction Dehalogenation Technologymentioning

confidence: 99%

Electrocatalytic dehalogenation in the applications of organic synthesis and environmental degradation

Zhao,

Yao,

Zhang

et al. 2024

EcoEnergy

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“…Such a technique has been applied in better understanding the reductive degradation mechanisms of PFAS in water system. , Simulations considering chemicals stabilized on the modified cathode including MWCNT-COOH and carbon paper are also recommended. Compared to electrochemical oxidation, the electroreductive approach is more compatible with the subsurface environment, which has been demonstrated by field investigations. , The milder condition of the electroreductive system also allow potential cooperation with obligate anaerobes, such as Dehalococcoides or other dehalogenating bacteria, , especially when microbial defluorination of unsaturated PFAS has been proven. , Bioelectroreduction systems with lower energy consumption and higher efficiency applied in the remediation of PFAS-polluted groundwater could be prospective in the future.…”

Section: Environmental Implicationsmentioning

confidence: 99%

Electroreductive Defluorination of Unsaturated PFAS by a Quaternary Ammonium Surfactant-Modified Cathode via Direct Cathodic Reduction

Wang

Xiao

Lin

et al. 2023

Environ. Sci. Technol.

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Remediation of per- and polyfluoroalkyl substances (PFAS) in groundwater remains a technological challenge due to the trace concentrations of PFAS and the strength of their C–F bonds. This study investigated an electroreductive system with a quaternary ammonium surfactant-modified cathode for degrading (E)-perfluoro(4-methylpent-2-enoic acid) (PFMeUPA) at a low cathodic potential. A removal efficiency of 99.81% and defluorination efficiency of 78.67% were achieved under −1.6 V (vs Ag/AgCl) at the cathode modified by octadecyltrimethylammonium bromide (OTAB). The overall degradation procedure started with the adsorption of PFMeUPA onto the modified cathode. This adsorption process was promoted by hydrophobic and electrostatic interactions between the surfactants and PFMeUPA, of which the binding percentage, binding mode, and binding energy were determined via molecular dynamics (MD) simulations and density functional theory (DFT) calculations. The step-wise degradation pathway of PFMeUPA, including reductive defluorination and hydrogenation, was derived. Meanwhile, C–F bond breaking with direct electron transfer only was achieved for the first time in this study, which also showed that the CC bond structure of PFAS facilitates the C–F cleavage. Overall, this study highlights the crucial role of quaternary ammonium surfactants in electron transfer and electrocatalytic activities in the electroreductive system and provides insights into novel remediation approaches on PFAS-contaminated groundwater.

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“…Halogenated organic compounds (HOCs), also known as organohalogens, hold significant value as chemical feedstocks in various fields including cooling technology, pharmaceuticals, agriculture, and plastics manufacturing. − The development of high-performance adsorbents for halogenated organic compounds has garnered tremendous attention over the years. − On the one hand, specific HOCs, such as certain chlorinated solvents, have been associated with adverse health effects . Prolonged exposure to these compounds through inhalation, ingestion, or dermal contact can lead to respiratory issues, liver damage, kidney problems, and even cancer in some cases. − On the other hand, some HOCs are primarily obtained as mixtures through the direct halogenation of hydrocarbons, necessitating their separation. − For example, cis / trans -dichloroethylene ( ci s/ trans -DCE ), both of which can be used to synthesize copolymeric materials, have completely different applications …”

Section: Introductionmentioning

confidence: 99%

Cis–Trans and Length-Selective Molecular Discrimination of Halogenated Organic Compounds by a Crystalline Hybrid Macrocyclic Arene

Li,

Shao,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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The development of adsorbents with robust molecular discrimination capabilities for halogenated organic compounds (HOCs) holds significant importance due to their potential in adsorptive separation and mitigation of associated health risks. In this study, we report a molecular discrimination behavior based on crystalline hybrid macrocyclic arene H, offering precise capture of cis−trans isomers and length-selective separation of HOCs. The activated H crystals (Hα) demonstrate exceptional discrimination and separation performance by selectively capturing trans-1,2-dichloroethylene (trans-DCE) from cis/trans-isomer mixtures with a high selectivity of 98.8%. Evidenced by single-crystal X-ray diffraction and density functional theory (DFT) calculations, this high adsorption selectivity arises from the formation of more stable complex crystals between H and the preferred guest trans-DCE. Moreover, Hα exhibits the ability to selectively trap size-matched 1,2-dibromoethane (DBE) from mixtures of alkylene dibromides with varying alkane-chain lengths, although their capture and separation are recognized to be difficult as a consequence of lowpolarity bonds. The solid-state transformations between guest-free and guest-containing Hα crystals indicate their recyclability, showcasing promising prospects for potential applications.

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Bioelectrochemical system for dehalogenation: A review

Cited by 31 publications

References 130 publications

Electrocatalytic dehalogenation in the applications of organic synthesis and environmental degradation

Electrocatalytic dehalogenation in the applications of organic synthesis and environmental degradation

Electroreductive Defluorination of Unsaturated PFAS by a Quaternary Ammonium Surfactant-Modified Cathode via Direct Cathodic Reduction

Cis–Trans and Length-Selective Molecular Discrimination of Halogenated Organic Compounds by a Crystalline Hybrid Macrocyclic Arene

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