Three-dimensional electrochemical process for wastewater treatment: A general review

Zhang, Chao; Jiang, Yonghai; Li, Yunlin; Hu, Zhongxin; Zhou, Lei; Zhou, Minghua

doi:10.1016/j.cej.2013.05.033

Cited by 461 publications

(206 citation statements)

References 113 publications

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“…In this 3D electrocatalytic system, the AuPd/ Fe 3 O 4 PEs were polarized to form numbers of charged microelectrodes with one surface of which was positively charged and can be considered as anode [21], thus Fe 2+ can be in-situ released by polarized anodizing, which was similar to the AFT system. Meanwhile, the effective reducing capacity of AuPd alloys can't be ignored.…”

Section: Degradation Kinetics Of Bmim In Aupd/fe 3 O 4 -Based Threedimentioning

confidence: 99%

“…The added particles are polarized and functionalized as charged microelectrodes [18], around which electrochemical reactions take place with a shortened transfer distance and an enlarged specific reaction area, greatly improving the reaction rate. The 3D electrocatalytic system has been applied into the degradation of organic pollutants including dyes, oil refinery wastewater, phenolic compounds and derivatives [18][19][20][21]. In these cases, PEs with nanoscale, high specific surface area, good catalytic activity and stability are highly recommended, all of which play a vital role in determining the electrocatalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

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AuPd/Fe3O4-based three-dimensional electrochemical system for efficiently catalytic degradation of 1-butyl-3-methylimidazolium hexafluorophosphate

Qin

Sun

Liu

et al. 2015

Electrochimica Acta

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Keywords: three-dimensional system AuPd/Fe 3 O 4 ionic liquids kinetic study degradation mechanism A B S T R A C T Ionic liquids (ILs) have been reported to be toxic and harmful to aquatic and terrestrial organisms, thus it is imperative to remove the residual ILs in various effluents. In this work, a three-dimensional (3D) electrocatalytic system with synthesized AuPd/Fe 3 O 4 nanoparticles (NPs) as particle electrodes (PEs) was established for the degradation of typical 1-butyl-3-methylimidazolium ([BMIM]) based ILs. The assynthesized AuPd/Fe 3 O 4 possessed preferable electrochemical properties for in situ supplement of H 2 O 2 and renewable Fe species. This 3D electrocatalytic system exhibited excellent performance with 100% removal rate of BMIM in 90 min under 120 mA, pH 3, and 1 g/L dosage of AuPd/Fe 3 O 4 NPs. Kinetics study revealed that the degradation rule of BMIM well followed the anodic Fenton treatment (AFT) model, in which the variation of the degradation rate was positively correlated with that of dissolved Fe 2+ , while significantly differed from the evolution of H 2 O 2 . Particularly, the appearance of the H 2 O 2 inflection point suggested the optimal effectiveness of AuPd/Fe 3 O 4 -based 3D electrocatalysis. During this electrocatalytic process, the active HO was produced over the AuPd/Fe 3 O 4 PEs, thereby initiated the highly efficient degradation of BMIM into 1-butyl-3-methyl-2,4,5-trioxoimidazolidine, 1-butyl-3-methylurea and N-butyl-formamide as main intermediates. The electrocatalytic stability of the AuPd/Fe 3 O 4 PEs over seven times further indicated the potential applicability for organic wastewater treatment.

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Section: Degradation Kinetics Of Bmim In Aupd/fe 3 O 4 -Based Threedimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

AuPd/Fe3O4-based three-dimensional electrochemical system for efficiently catalytic degradation of 1-butyl-3-methylimidazolium hexafluorophosphate

Qin

Sun

Liu

et al. 2015

Electrochimica Acta

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“…Among these methods, electrocoagulation is currently gaining attention from the scientific community due to the many advantages it offers over the conventional biological treatment. It is referred to as an environmental technology owing to the fact that it uses a clean reagent (electron) for the abatement of organic and recalcitrant pollutants [20]. It produces less sludge, has compact treatment facility (less footprint) and the possibility of complete automation can be expected [21,22].…”

Section: Introductionmentioning

confidence: 99%

Removal of Pharmaceuticals from Wastewater by Intermittent Electrocoagulation

Ensano

Borea

Naddeo

et al. 2017

Water

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Abstract:The continuous release of emerging contaminants (ECs) in the aquatic environment, as a result of the inadequate removal by conventional treatment methods, has prompted research to explore viable solutions to this rising global problem. One promising alternative is the use of electrochemical processes since they represent a simple and highly efficient technology with less footprint. In this paper, the feasibility of treating ECs (i.e., pharmaceuticals) using an intermittent electrocoagulation process, a known electrochemical technology, has been investigated. Diclofenac (DCF), carbamazepine (CBZ) and amoxicillin (AMX) were chosen as being representative of highly consumed drugs that are frequently detected in our water resources and were added in synthetic municipal wastewater. The removal efficiencies of both individual and combined pharmaceuticals were determined under different experimental conditions: hydraulic retention time (HRT) (6, 19 and 38 h), initial concentration (0.01, 4 and 10 mg/L) and intermittent application (5 min ON/20 min OFF) of current density (0.5, 1.15 and 1.8 mA/cm 2 ). Results have shown that these parameters have significant effects on pharmaceutical degradation. Maximum removals (DCF = 90%, CBZ = 70% and AMX = 77%) were obtained at a current density of 0.5 mA/cm 2 , an initial concentration of 10 mg/L and HRT of 38 h.

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“…It can deal with both inorganic and organic pollutants without the addition of REDOX agents and secondary pollution, and it is an environmentally friendly green water treatment technology. The basic principle of three-dimensional electrode [5] [6] in COD treatment is electric catalytic REDOX reaction. The particles are respectively brought into positive and negative charges by electrostatic induction under the action of electric field between the main electrodes, then each particle becomes an independent electrode, and electrochemical REDOX reaction takes place at the surface of each particle at the same time to make the organic pollutants degraded.…”

Section: Introductionmentioning

confidence: 99%

Study on the Degradation of Oilfield Wastewater Treatment by Three-Dimensional Electrode

Liu¹,

Yang²,

Jing³

et al. 2017

OJOGas

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The COD value is the main control index of sewage standard. The method of three-dimensional electrocatalytic oxidation is studied for deep treatment of oilfield sewage. The oxidation mechanism and the structure of the three-dimensional electrode reactor are analyzed and optimized. A series of single factor experimental results show that each control parameter has different influences on COD removal rate in the process of oxidative degradation. Based on the experimental study of electrode materials, electrode filled particles, electrolysis current and resident time of sewage, when the system condition are DSA electrode-F plate, the electrode particles of activated carbons:glass beads:quartz sands = 5:2:2, the electrolysis current of 6 A and the retention time of 50 min, the sewage by oxidized treatment meets the discharge standard of COD ≤ 50 mg·L −1. The SEM result analysis of DSA electrode-F plate before and after using for a period of time shows the electrode material is stable, and no dissolution and corrosion occur. The UV-Vis absorption spectroscopy analysis of water samples in the wavelength range of 200 -600 nm shows pollutants in sewage are degraded into small molecules, and refractory organic pollutants are effectively removed.

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Three-dimensional electrochemical process for wastewater treatment: A general review

Cited by 461 publications

References 113 publications

AuPd/Fe3O4-based three-dimensional electrochemical system for efficiently catalytic degradation of 1-butyl-3-methylimidazolium hexafluorophosphate

AuPd/Fe3O4-based three-dimensional electrochemical system for efficiently catalytic degradation of 1-butyl-3-methylimidazolium hexafluorophosphate

Removal of Pharmaceuticals from Wastewater by Intermittent Electrocoagulation

Study on the Degradation of Oilfield Wastewater Treatment by Three-Dimensional Electrode

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