Electrocatalytic hydrodehalogenation of 2,4-dichlorophenol in aqueous solution on palladium–nickel bimetallic electrode synthesized with surfactant assistance

Sun, Zhirong; Wang, Kun; Wei, Xuefeng; Shan, Tong; Hu, Xiang

doi:10.1016/j.ijhydene.2012.09.109

Cited by 29 publications

(17 citation statements)

References 43 publications

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“…PZDs were built with The Chemical Equilibrium Software (MEDUSA), 16 in ammoniacal medium, in the presence of Cl − and SO 4 2− considering the following concentrations: (Figure 2), where Pd(II) and Ni(II) concentrations are eight times higher than those proposed by Sun et al (2012) 12 meanwhile Pd(II)/Ni(II) concentration ratio is similar. In the case of Ni(II), the Ni(II)-NH 3 complexes form at pH above 8 and at higher concentrations of 2M NH 4 Cl ( Figure 2a); whereas the Pd(II)-NH 3 complexes form at pH above 6 and at the entire range of NH 4 Cl concentrations considered herein (Figure 2b).…”

Section: Resultsmentioning

confidence: 99%

“…10 In a ECH mechanism, the chemisorbed hydrogen atoms (H ads ) generated on the electrode surface by water electrolysis provide the driving force for chemical reduction causing the C-Cl bond cleavage from 2-CP. ECH involves several steps as described in reactions 1 through 6 11,12 : [5] (H ) ads M + (H ) ads M → H 2 + M Tafel step [6] where M represents the electrocatalytic metal or alloy. The key steps of the ECH process are proton reduction (H + ) and hydrogen adsorption (H ads ) (reaction 1).…”

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confidence: 99%

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Electrochemical Dechlorination of 2-Chlorophenol on Pd/Ti, Ni/Ti and Pd-Ni Alloy/Ti Electrodes

Arellano-González

Texier

Lartundo-Rojas

et al. 2015

J. Electrochem. Soc.

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The 2-chlorophenol has been treated by advanced oxidation processes (AOPs) and by electrochemical oxidation, but these methods show several disadvantages, such as: high-energy costs, hazardous substances production and electrode deactivation. To avoid the problems caused by oxidation, electrochemical reduction (dechlorination) was proposed as an alternative and promising method. Pd/Ti, Ni/Ti and Pd-Ni alloy/Ti cathodes were used for electrochemical dechlorination of 2-chlorophenol. The cathodes were prepared by electrodeposition under experimental conditions determined from both a thermodynamic study by using predominance existence and distribution species diagrams and a voltammetric study. The electrodes were characterized by SEM, XRD, and XPS. SEM images showed that Pd-Ni/Ti electrode has a different morphology from that of Pd/Ti and Ni/Ti electrodes and the alloy composition is 45% Pd and 49% Ni mol. XRD analyses showed that Pd-Ni alloy /Ti exhibits a network parameter different from those of Pd/Ti and Ni/Ti electrodes. The XPS proved the formation of Pd-Ni alloy. The efficient dechlorination of 2-chlorophenol to phenol was achieved under electrochemical conditions where proton reduction and atomic hydrogen adsorption took place. The Pd-Ni alloy/Ti electrode had the highest dechlorination efficiency (100% removal) and phenol formation (100% formation) at a potential of −0.40 Vvs Ag/AgCl (s) /KCl (sat) .

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Electrochemical Dechlorination of 2-Chlorophenol on Pd/Ti, Ni/Ti and Pd-Ni Alloy/Ti Electrodes

Arellano-González

Texier

Lartundo-Rojas

et al. 2015

J. Electrochem. Soc.

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“…Pd/C cathode showed a near complete removal of 2,4-DCP after 80 min, but continuous hydrogen was fed into the system compartment to enhance the generation of reactive hydrogen atoms [16]. Some novel surfactant modified Pd-loaded electrodes have been reported as highly effective catalysts for 2,4-DCP dechlorination within 70 min, but low initial pH was required to achieve the high removal efficiency [6,12,30].…”

Section: Cyclic Voltammetry Experiments Of Different Rate and Cyclesmentioning

confidence: 99%

“…In a typical electro-catalytic system, the active H atoms, which are produced from decomposition of in situ generated H 2 on the electrode surface, are proposed to be the main reactive species for C-Cl bond cleavage [6,12]. The electrode material and its surface features are principal variables that govern the production of the reactive atomic H, which is available for reduction reactions [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO2NTs/Ti cathode

Bao

2015

Front. Environ. Sci. Eng.

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In this study, palladium-loaded titania nanotubes was fabricated on a titanium plate (Pd/TiO 2 NTs/Ti) for efficient electrodechlorination of 2,4-chlorophenol with a mild pH condition. The nature of Pd/TiO 2 NTs/Ti electrodes was characterized by field-emission scanning electron microscope (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) techniques. The characterization results indicated the generation of Pd 0 nanoparticles which were evenly dispersed on titania nanotubes arrays on the Pd/ TiO 2 NTs/Ti surface. An effective degradation efficiency of up to 91% was achieved within 60 min at cathode potential of -0.7 V (vs. SCE) and initial pH of 5.5. The effects of the applied cathode potential and initial pH on the degradation efficiency were studied. A near neutral condition was more favorable since very low and very high pHs were not conducive to the dechlorination process. Furthermore, the intermediates analysis showed that the Pd/TiO 2 NTs/Ti electrode could completely remove chlorine from 2, 4-dichlorophenol since only phenol was detected as the byproduct and the concentration of released chlorine ions indicated near-complete dechlorination. This work presents a good alternative technique for eliminating persistent chlorophenols in polluted wastewater without maintaining strong acidic environment.

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“…In recent years, many technologies including biological degradation, advanced oxidation, adsorption, electroreductive dechlorination and nanoscale zero‐valent iron (nZVI) reduction have been developed for reducing chlorinated contaminants in aquatic environments. Among these methods, the use of nZVI has drawn significant attention due to its large surface areas and high reduction potential .…”

Section: Introductionmentioning

confidence: 99%

Enhanced dechlorination of 2,4‐dichlorophenoxyacetic acid by Pd/Fe nanoparticles in the presence of environment‐friendly iminodisuccinic acid

Zhou

Zhao

Xiang

et al. 2018

Applied Organom Chemis

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Environment-friendly iminodisuccinic acid (IDS) has been recognized to enhance the reactivity of Pd/Fe nanoparticles (nPd/Fe) for the effective dechlorination of 2,4-dichlorophenoxyacetic acid (2,4-D). In this study, the improving effects of IDS and other experimental parameters, such as IDS concentration, initial pH, Pd ratio and reaction temperature, on the reduction of 2,4-D were investigated. Characterization analyses of nPd/Fe with and without IDS were performed, and the mechanism of the improvement by IDS of nPd/Fe reactivity was also elucidated. Results revealed that IDS not only removed the passivation layer on nanoscale zero-valent iron (nZVI) surface, but also inhibited the iron ions from forming nZVI surface passivation layer through complexation.As a result, nPd/Fe maintained their reactivity throughout the reaction. In the presence of IDS, the removal efficiency of 2,4-D by nPd/Fe was significantly increased from 32.5 to 99.2%, and nearly 96.2% phenoxyacetic acid (PA) was simultaneously generated. The findings from the present study demonstrate that IDS could be a promising alternative complexing agent for inhibiting surface passivation and enhancing the effective utilization of nPd/Fe for dechlorination.

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Electrocatalytic hydrodehalogenation of 2,4-dichlorophenol in aqueous solution on palladium–nickel bimetallic electrode synthesized with surfactant assistance

Cited by 29 publications

References 43 publications

Electrochemical Dechlorination of 2-Chlorophenol on Pd/Ti, Ni/Ti and Pd-Ni Alloy/Ti Electrodes

Electrochemical Dechlorination of 2-Chlorophenol on Pd/Ti, Ni/Ti and Pd-Ni Alloy/Ti Electrodes

Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO2NTs/Ti cathode

Enhanced dechlorination of 2,4‐dichlorophenoxyacetic acid by Pd/Fe nanoparticles in the presence of environment‐friendly iminodisuccinic acid

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