Electrocatalytic dechlorination of 2,4-dichlorophenol in aqueous solution on palladium loaded meshed titanium electrode modified with polymeric pyrrole and surfactant

Sun, Zhirong; Wei, Xuefeng; Hu, Xiang; Wang, Kun; Shen, Haitao

doi:10.1016/j.colsurfa.2012.08.035

Cited by 48 publications

(22 citation statements)

References 41 publications

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“…This was not surprising since the system could not supply enough reactive hydrogen atoms at a low H + concentration. According to Sun et al [6], a very low initial pH not only can increase the removal efficiency and current efficiency, but it can also bring the final pH to be almost neutral since the pH value would increase when dechlorination finished. Nevertheless, a total of 75% of the 2,4-DCP was removed when the initial pH was 3.0.…”

Section: Cyclic Voltammetry Experiments Of Different Rate and Cyclesmentioning

confidence: 98%

“…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: 98%

“…Many methods, such as adsorption, biodegradation, advanced oxidation, reductive dechlorination, etc., have been proposed to treat chlorophenol-contaminated wastewater [2][3][4][5]. Adsorption is not cost-efficient, and further treatment is needed after this process, during which there is a potential risk of second pollution [6]. Biodegradation of chlorophenols is difficult to process since chlorophenols are toxic to microorganisms [2].…”

Section: Introductionmentioning

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%

See 3 more Smart Citations

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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Section: Cyclic Voltammetry Experiments Of Different Rate and Cyclesmentioning

confidence: 98%

Section: Cyclic Voltammetry Experiments Of Different Rate and Cyclesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Recently, researchers (Chen 2004;Anglada et al 2009;Wang et al 2010;Sun et al 2012b) had paid great attention on the removal efficiency in degrading various pollutants on all kinds of electrodes, enhancement of electrochemical stability of anodic material of electrodes, investigation of factors affecting the electrodes performance, and explanation of the mechanisms and kinetics of pollutant degradation. During the anodic materials of common electrode, such as, graphite, carbon fibers, platinum, diamond, gold (Au), aluminum, iron, PbO 2 , SnO 2, TiO 2 , Ti/Pt, Ti/SnO 2 , Ti/PbO 2 , Ti/RuO 2 -TiO 2 , Ti/IrO 2 -TiO 2 , Ti/IrO 2 -RuO 2 -TiO 2 , boron-doped diamond (BDD) electrode, Titanium-based boron-doped diamond electrode (BDD/Ti) were widely used in the wastewater treatment.…”

Section: Hot Issuesmentioning

confidence: 99%

Research trends in electrochemical technology for water and wastewater treatment

et al. 2015

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It is difficult to completely degrade wastewater containing refractory pollutants without secondary pollution by biological treatment, as well as physical-chemical process. Therefore, electrochemical technology has attracted much attention for its environmental compatibility, high removal efficiency, and potential cost effectiveness, especially on the industrial wastewater treatment. An effective bibliometric analysis based on the Science Citation Index Core Collection database was conducted to evaluate electrochemical technology for water and wastewater treatment related research from 1994 to 2013. The amount of publications significantly increased in the last two decades. Journal of the Electrochemical Society published the most articles in this field with a top h-index of 90, taking 5.8 % of all, followed by Electrochimica Acta and Journal of Electroanalytical Chemistry. The researchers focused on categories of chemistry, electrochemistry, and materials science. China and Chinese Academy of Sciences were the most productive country and institution, respectively, while the USA, with the most international collaborative articles and highest h-index of 130, was the major collaborator with 15 other countries in top 20 most productive countries. Moreover, based on the analysis of author keywords, title, abstract, and 'KeyWords Plus', a new method named ''word cluster analysis'' was successfully applied to trace the research hotspot. Nowadays, researchers mainly focused on novel anodic electrode, especially on its physiochemical and electrochemical properties.

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Electrochemical Activation of Carbon–Halogen Bonds: Electrocatalysis at Palladium–Copper Nanoparticles

et al. 2014

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Palladized Cu nanoparticles (Pd/Cu NPs) supported on glassy carbon (GC) were synthetized by electrolytic deposition of Cu on GC, followed by galvanic displacement of Cu with Pd. The electrodes were characterized by XPS and EDX, which show that, although the composition of the NPs depends on the deposition time of Pd, Cu is always the main component, whereas Pd is preferentially limited to the uppermost layer of the nanoparticle surface. The reductive cleavage of a series of organic chlorides was investigated at Cu, Pd, Cu NPs and Pd/Cu NPs both in DMF and DMF/H2O (3/1 v/v). A strong dependence of the electrocatalytic properties of the electrodes on the mechanism of dissociative electron transfer (DET) was observed in pure DMF; moderate electrocatalysis was found for the reduction of all alkyl halides undergoing concerted DET, whereas no appreciable catalysis was observed for the reduction of aromatic chlorides, which undergo stepwise DET. However, addition of H2O remarkably enhances the catalytic activity of the metals. In DMF/H2O, all investigated compounds are catalytically reduced at Cu, Cu NPs and Pd/Cu NPs with good to excellent catalytic effects

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Electrocatalytic dechlorination of 2,4-dichlorophenol in aqueous solution on palladium loaded meshed titanium electrode modified with polymeric pyrrole and surfactant

Cited by 48 publications

References 41 publications

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

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

Research trends in electrochemical technology for water and wastewater treatment

Electrochemical Activation of Carbon–Halogen Bonds: Electrocatalysis at Palladium–Copper Nanoparticles

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