Kinetics of electrochemical dechlorination of 2-chlorobiphenyl on a palladium-modified nickel foam cathode in a basic medium: From batch to continuous reactor operation

He, Zhiqiao; Lin, Keji; Sun, Junjun; Wen, Lina; Gao, Chao; Chen, Jianmeng; Song, Shuang; Qian, Yanyun; Liu, Weiping

doi:10.1016/j.electacta.2013.07.207

Cited by 31 publications

(15 citation statements)

References 63 publications

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“…Some researchers prepared Pd/Ti electrodes by the electrochemical deposition for the dechlorination of chlorinated organic compounds [7,8]. And some scholars used other substrate materials, such as foam-nickel and glassy carbon modified by Pd [9][10][11][12]. In addition, to gain smaller Pd particle sizes and higher particle dispersion, Perini et al treated the glassy carbon as a substrate material [12].…”

Section: Introductionmentioning

confidence: 99%

Preparation and electrocatalytic dechlorination performance of Pd/Ti electrode

Zhang

Cao

Chi

et al. 2014

Desalination and Water Treatment

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A B S T R A C TThe Pd/Ti working electrode was prepared by the electrochemical deposition on the Ti plate and its structure and morphology were analyzed by an X-ray diffraction (XRD) and a transmission electron microscopy. The results showed that Palladium (Pd) crystals were coated uniformly on Titanium (Ti) base material with the average size of 8.69 nm. The cyclic voltammetry was employed to study the electrochemical reduction characteristics of 2,4,5-tripolychlorinated biphenyl (PCB29) in an electrocatalytic system. The results showed that the PCB29 dechlorination was a two-electron transfer reduction controlled by adsorption and conformed to the characteristics of the first-order reaction. The efficiencies of PCB29 degradation in the electrocatalytic system were more than 95% after 5 h at its concentration (mg/L) of 60, 80, and 100. The dechlorinations of PCB29 obeyed the pseudo-first-order reaction kinetic behavior. The reaction rate constant was approximately 0.011 min −1 . The reaction rate increased slightly as the temperature rose. The 2,5-PCB was first mainly generated by PCB29 para-position dechlorination, 2-PCB by meta-position dechlorination, and then diphenyl by the subsequent ortho-position dechlorination. Diphenyl could be further hydrogenated to phenyl cyclohexane. The chlorine substitution position on PCB29 mainly affected the order of PCB29 electrocatalytic dechlorination.

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Section: Introductionmentioning

confidence: 99%

Preparation and electrocatalytic dechlorination performance of Pd/Ti electrode

Zhang

Cao

Chi

et al. 2014

Desalination and Water Treatment

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“…So far, the efficient reductive dechlorination of chlorinated organic compounds (COCs) was achieved via zero-valent iron and palladium-based materials (Lowry and Reinhard, 2001; Lien and Zhang, 2005; Liu et al, 2006; Wu and Ritchie, 2006; Petersen et al, 2007a; Phillips et al, 2010; Ma et al, 2012; He et al, 2013). …”

Section: Introductionmentioning

confidence: 99%

“…The H a further involves in electrochemical desorption (Heyrovsky reaction) or chemical desorption (Tafel reaction) to create hydrogen gas or interacts with the reducible chemicals like chlorinated substances, which leads to HDC. The dechlorination rate is affected by mass transfer, electron transfer and chemical reactions, as well as surface reactions, such as adsorption and desorption (Chaplin et al, 2012; He et al, 2013). Apart from electroreduction, electrochemically-induced oxidation of COCs can be achieved through reactions at the anode (Azzam et al, 2000) or via hydroxyl radicals generated in bulk solution (Martinez-Huitle and Ferro, 2006; Panizza and Cerisola, 2009; Yuan et al, 2012, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, palladized electrodes were widely investigated for removal of COCs (Li and Farrell, 2000; Roh et al, 2001; Jovanovic et al, 2005; Yang et al, 2006, 2007; He et al, 2013; Li et al, 2013). In this case, the deposition of small amounts of Pd catalyst on the cathode substrate enhances its ability to absorb hydrogen into the lattice and increases the rate of HDC.…”

Section: Introductionmentioning

confidence: 99%

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The influence of cathode material on electrochemical degradation of trichloroethylene in aqueous solution

et al. 2016

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In this study, different cathode materials were evaluated for electrochemical degradation of aqueous phase trichloroethylene (TCE). A cathode followed by an anode electrode sequence was used to support reduction of TCE at the cathode via hydrodechlorination (HDC). The performance of iron (Fe), copper (Cu), nickel (Ni), aluminum (Al) and carbon (C) foam cathodes was evaluated. We tested commercially available foam materials, which provide important electrode surface are and properties for field application of the technology. Ni foam cathode produced the highest TCE removal (68.4%) due to its high electrocatalytic activity for hydrogen generation and promotion of HDC. Different performances of the cathode materials originate from differences in the bond strength between atomic hydrogen and the material. With a higher electrocatalytic activity than Ni, Pd catalyst (used as cathode coating) increased TCE removal from 43.5% to 99.8% for Fe, from 56.2% to 79.6% for Cu, from 68.4% to 78.4% for Ni, from 42.0% to 63.6% for Al and from 64.9% to 86.2% for C cathodes. The performance of the palladized Fe foam cathode was tested for degradation of TCE in the presence of nitrates, as another commonly found groundwater species. TCE removal decreased from 99% to 41.2% in presence of 100 mg L−1 of nitrates due to the competition with TCE for HDC at the cathode. The results indicate that the cathode material affects TCE removal rate while the Pd catalyst significantly enhances cathode activity to degrade TCE via HDC.

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“…Indirect reduction (hydrodechlorination, HDC) involves the reaction of the chlorinated substance with atomic hydrogen. A typical electrochemical dechlorination reaction occurs via a series of steps [28]: transfer of dissolved molecules from the bulk solution to the electrode surface; adsorption of the molecule on the metal surface; formation of chemisorbed hydrogen from H 2 O reduction (Volmer reaction); reaction between molecule and chemisorbed hydrogen (Hydrodechlorination); desorption of the hydrogenated products; and, finally, release of reduction products from the electrode surface to the bulk solution.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical transformation of thichloroethylene in groundwater by Ni-containing cathodes

Rajić

Fallahpour

Oguzie

2015

Electrochimica Acta

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In this study, we evaluate the use of different stainless steel (SS) materials as cost-effective cathode materials for electrochemical transformation of trichloroethylene (TCE) in contaminated groundwater. Ni, which is present in certain SS, has low hydrogen overpotential that promotes fast formation of atomic hydrogen and, therefore, its content can enhance hydrodechlorination (HDC). We a flow-through electrochemical reactor with a SS cathode followed by an anode. The performance of Ni containing foam cathodes (Fe/Ni and Ni foam) was also evaluated for electrochemical transformation of TCE in groundwater. SS type 316 (12% Ni) removed 61.7% of TCE compared to 52.6% removed by SS 304 (9.25% Ni) and 37.5% removed by SS 430 (0.75% Ni). Ni foam cathode produced the highest TCE removal rate (68.4%) compared with other cathodes. The slightly lower performance of SS type 316 mesh is balanced by the reduction in treatment costs for larger-scale systems. The results prove that Ni content in SS highly influences TCE removal rate.

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Kinetics of electrochemical dechlorination of 2-chlorobiphenyl on a palladium-modified nickel foam cathode in a basic medium: From batch to continuous reactor operation

Cited by 31 publications

References 63 publications

Preparation and electrocatalytic dechlorination performance of Pd/Ti electrode

Preparation and electrocatalytic dechlorination performance of Pd/Ti electrode

The influence of cathode material on electrochemical degradation of trichloroethylene in aqueous solution

Electrochemical transformation of thichloroethylene in groundwater by Ni-containing cathodes

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