An investigation on the new operational parameter effective in Cr(VI) removal efficiency: A study on electrocoagulation by alternating pulse current

Keshmirizadeh, Elham; Yousefi, Somayeh; Rofouei, Mohammad Kazem

doi:10.1016/j.jhazmat.2011.03.010

Cited by 115 publications

(30 citation statements)

References 23 publications

(43 reference statements)

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“…However, only a few works approached the economic aspects [26] of EC technique. Excepting the works of Keshmirizadeh et al [24] and Eyvaz et al [27], according to our knowledge, no other studies concerning operating costs of EC in APC mode have been reported so far.…”

Section: Introductionmentioning

confidence: 67%

“…Recently, Keshmirizadeh et al [24] reported the removal of Cr(VI) from aqueous solutions by EC in APC mode using Al-Fe configuration. They claimed that the main effects of applying APC compared with DC consisted in an improved turbidity and water recovery (92% in APC vs. 50% in DC mode).…”

Section: Effect Of Electrode Configurationmentioning

confidence: 99%

“…In case of aluminum electrodes, Al 3+ is produced, which generates further Al(OH) 2+ , AlðOHÞ þ 2 , gelatinous Al(OH) 3 that is finally polymerized to Al n (OH) 3n [24]. Anodic dissolution of iron leads to the formation of FeOH 2+ , Fe(OH) 2 , FeðOHÞ þ 2 , Fe(OH) 3 , FeðOHÞ À 4 , and FeO(OH) [19].…”

Section: Introductionmentioning

confidence: 99%

“…Anodic dissolution of iron leads to the formation of FeOH 2+ , Fe(OH) 2 , FeðOHÞ þ 2 , Fe(OH) 3 , FeðOHÞ À 4 , and FeO(OH) [19]. Then, charged particles present in wastewater are transformed into amorphous precipitates, absorbed on the flocs of metallic hydroxides or complexed (where the pollutant acts as a ligand and is chemically bind by hydrous iron) and removed by sedimentation and/or flotation [4,24,25].…”

Section: Introductionmentioning

confidence: 99%

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Effects of electric current type and electrode configuration on the removal of Indigo Carmine from aqueous solutions by electrocoagulation in a batch reactor

Secula

Zaleschi

Stan

et al. 2013

Desalination and Water Treatment

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Ioan Mămăligă (2014) Effects of electric current type and electrode configuration on the removal of Indigo Carmine from aqueous solutions by electrocoagulation in a batch reactor, Desalination and Water Treatment, 52:31-33, 6135-6144, A B S T R A C TThe aim of this study is to investigate several electrode configurations and establish the effects of alternating current (AC), alternating pulse current (APC), and direct current (DC) on an electrocoagulation (EC) process conducted in a batch reactor. Indigo Carmine (IC) was considered as pollutant model. The investigated electrode configurations consisted in aluminum/aluminum, mild steel/mild steel, and aluminum/mild steel pairs. The effects of electrode configurations and current regimes on the removal efficiency, energy consumption, electrical operating costs, and electrode dissolution rate are discussed. The most powerful electrode configuration for IC removal from aqueous solutions by EC consisted in an anode of mild steel and a cathode of aluminum. EC operated in AC mode resulted in low efficiencies in any electrode configuration of those considered. Contrariwise, APC provided higher performance to the EC process in comparison with DC. Also, it led to higher dissolution rates in case of aluminum electrodes and to a more stable removal of dye when mild steel anode was employed. Energy-Dispersive X-Ray spectroscopy, Fourier transform infrared (FTIR), and scanning electron microscopy (SEM) analytical methods were used to characterize the sludge separated by sedimentation and flotation in case of EC in APC mode using Al-Fe configuration. Thus, it was shown that IC dye was adsorbed on aluminum and iron hydroxides.

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Section: Introductionmentioning

confidence: 67%

Section: Effect Of Electrode Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of electric current type and electrode configuration on the removal of Indigo Carmine from aqueous solutions by electrocoagulation in a batch reactor

Secula

Zaleschi

Stan

et al. 2013

Desalination and Water Treatment

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show abstract

“…Initially, the ozone contribution in the integrated process increases the oxidation of pollutants that are dissolved in the solution and that cannot be eliminated via electrocoagulation. An advantage of supplying ozone into the reactor is that it promotes the mixing between the reactants and also maximizes the organics oxidation, that results in the decreasing of COD and color [28,47,48]. Furthermore, the ozone provides good mixing thought the reactor which improves the mass transfer.…”

Section: Electrocoagulation-ozone Processesmentioning

confidence: 99%

Enhanced electrocoagulation: New approaches to improve the electrochemical process (Review)

Barrera-Díaz

Roa‐Morales

Hernández

et al. 2014

J. Electrochem. Sci. Eng.

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Electrocoagulation is a promising technology for the removal of colloids from different types of wastewater and it has also demonstrated good efficiencies for the breaking-up of emulsions. It consists of the dissolution of aluminum or iron anodes, promoting the formation of coagulant reagents in wastewater that helps to coagulate pollutants and the formation of bubbles that favors the mixing (electroflocculation) and the removal of suspended solids by flotation (electroflotation). During the recent years, the combination of this technology with other treatment technologies has become a hot topic looking for a synergistic improvement in the efficiencies. This work aims to review some of the more recent works regarding this topic, in particular the combination of electrocoagulation with ozonation, adsorption and ultrasound irradiation.

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An Electrochemical Sensing Platform for the Detection of Lead Ions Based on Dicarboxyl‐Calix[4]arene

2018

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A simple and highly sensitive electrochemical sensor COOH−C4 derived from dicarboxyl‐calix[4]arene modified on a screen printed gold electrode (Au) was developed for the determination of lead ions in water samples. A 3‐mercaptopropionic acid (MPA) monolayer was used as a template on the gold electrode for the surface modification with dicarboxyl‐calixarene. The modified electrodes were surface‐characterized using Fourier Transform infrared spectroscopy (FTIR). The data obtained proved the confirmation of each stage of the electrode modification. The electrochemical analyses of the COOH−C4 electrode showed an enhanced electrocatalytic activity and higher current towards Pb2+ ions as compared to the bare Au and MPA/Au electrodes. Under optimum conditions, the differential pulse voltammetry response of COOH−C4 displayed a wide linear response ranging from 280–2500 μg/L for Pb2+ with a detection limit of 6.2 μg/L. In addition, the fabricated electrode showed a high selectivity and stability towards the Pb2+ ions in presence of possible interfering species. The present method was successfully applied to determine Pb2+ ions in real samples with satisfactory precision, with a relative standard deviation of 3.12 % and an acceptable recovery of 92 %, which demonstrated the potential application of dicarboxyl‐calix[4]arene modified on electrodes for heavy‐metal sensing.

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An investigation on the new operational parameter effective in Cr(VI) removal efficiency: A study on electrocoagulation by alternating pulse current

Cited by 115 publications

References 23 publications

Effects of electric current type and electrode configuration on the removal of Indigo Carmine from aqueous solutions by electrocoagulation in a batch reactor

Effects of electric current type and electrode configuration on the removal of Indigo Carmine from aqueous solutions by electrocoagulation in a batch reactor

Enhanced electrocoagulation: New approaches to improve the electrochemical process (Review)

An Electrochemical Sensing Platform for the Detection of Lead Ions Based on Dicarboxyl‐Calix[4]arene

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