Effect of pH and chloride concentration on the removal of hexavalent chromium in a batch electrocoagulation reactor

Arroyo, Missael; Pérez-Herranz, V.; Montañés, M.T.; Garcı́a-Antón, J.; Guiñón, J. L.

doi:10.1016/j.jhazmat.2009.04.089

Cited by 131 publications

(64 citation statements)

References 37 publications

(50 reference statements)

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“…One of these techniques is the process of electrocoagulation which is a novel and efficient method for heavy metals removal (Akbal and Camc 2011;Arroyo et al 2009;Bhatti et al 2009;Schulz et al 2009;Sun et al 2009). Other methods for removing metal ions from wastewater are deposition, evaporation, solvent extraction, ion exchange, reverse osmosis, separation by membrane, etc.…”

Section: Introductionmentioning

confidence: 99%

Effective parameters for the adsorption of chromium(III) onto iron oxide magnetic nanoparticle

Shahriari

Bidhendi

Mehrdadi

et al. 2013

Int. J. Environ. Sci. Technol.

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Most of the industrial wastewaters comprise toxic, biologically non-biodegradable, and heavy metals which tend to accumulate in the biological organisms causing different diseases. There are some novel technologies and strategies to remove these pollutants. Using the magnetic nanoparticles which are cheap, recyclable, and reusable can be considered as an effective method for removing the pollutants as they do not require conservation or complicated equipments. Using this method, dangerous and rare heavy metals can be restored to the industry. In this study, magnetic nanoparticles with the size of 30 nm were prepared and used for the removal of chromium from synthetic wastewater polluted by chromium sulfate. For this purpose, removal of various concentrations of chromium(III) from wastewater was investigated. The best concentration was achieved in the removal efficiency of 99.1 %. The optimal values of pH, rotation speed of magnetic stirrer, time, temperature, and the amount of nanoparticles were determined according to the primary concentration (500 mg/L). The mechanism of chromium adsorption onto iron oxide (Fe 3 O 4 ) magnetic nanoadsorbent was also investigated. The results showed both Freundlich and Longmuir isotherms to be the best fit for the chromium adsorption, with Freundlich isotherm being more suitable.

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Section: Introductionmentioning

confidence: 99%

Effective parameters for the adsorption of chromium(III) onto iron oxide magnetic nanoparticle

Shahriari

Bidhendi

Mehrdadi

et al. 2013

Int. J. Environ. Sci. Technol.

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“…20,21) In addition, some anions such as Cl ¹ can also affect the rate and extent of the reduction by enhancing iron corrosion. 22,23) However, few studies have investigated how the colloidal particles formed in aqueous solutions with NaCl affect the Cr(VI) reduction by ZVI.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaCl on Cr(VI) Reduction by Granular Zero Valent Iron (ZVI) in Aqueous Solutions

Ahn

Kim

et al. 2012

Mater. Trans.

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This study examined the effect of NaCl on the removal of Cr(VI) by ZVI in aqueous solutions and proposes a potential mechanism of Cr(VI) removal by ZVI in aqueous solutions with NaCl. A series of batch tests was conducted on ZVI using 100 mg/L Cr(VI) solutions at an initial pH of 3 at various NaCl concentrations. The NaCl in aqueous solutions improved the removal efficiency for Cr(VI) by ZVI. Fe(III)Cr(III) (oxy)hydroxides were precipitated both on the ZVI surface and in the solution via the reduction reactions of Cr(VI) to Cr(III) in the presence of NaCl. The increase in the Cr(VI) removal efficiency in the solutions with NaCl was attributed to the Cl ¹ ions, which accumulate at the anodic sites of ZVI, thereby enhancing ZVI oxidation and colloidal particle formation. In the NaCl solutions, small grains were initially precipitated on the ZVI surface, via relatively fast reactions. The subsequent slowing of these reactions resulted in the precipitation of large grains on the ZVI surface and colloidal particles in the solutions.

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“…The generation of metallic cations takes place at the anode, due to the electrochemical oxidation of the iron or aluminum, whereas at the cathode the production of H 2 typically occurs [13]. This reduction goes through these mechanisms: electrooxidation , surface complexation , electrostatic attraction, adsorption, chemical modification [14] .Current density is an important parameter for controlling the reaction rate in most electrochemical processes such as the EC processes.…”

Section: B Optimum Conditions Of Clarification Of Wastewater By Ec Tmentioning

confidence: 99%

Treatment of Fez City (Morocco) Effluent by Chemical Coagulation (CC) and Electrocoagulation (EC)

2016

IJACEBS

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Abstract-Heavy metals are released in the environment with a heavy load due to rapid industrialization and thus become a major global concern.At Fez city, chromium, zinc, copper, nickel, lead, antimony, and selenium, are often found in wastewater of artisanal industry (tanneries, pottery, copperware, etc).These metals are mostly present in trace amounts, but their toxicity develops through bioaccumulation in organisms, causing short-and long-term deleterious effects on biodiversity and human health. The objective of this work is the pretreatment of these effluents, to reduce or eliminate their metallic load by two methods: The coagulation-flocculation and ectrocoagulation using aluminum plates.The characterization of Fez city effluents demonstrates their highmineral and organic pollution load, that is nonbiodegradable.Treating this effluent by coagulation flocculation under optimum operating conditions revealed an important reduction of the organic matter, cupric ions Cu II and of chromium VI. As for treatment by electrocoagulation, the elimination of chromium VI and color is total and the other pollutants have reached a reduction ratio which is almost the same as that obtained by the coagulation flocculation.

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Effect of pH and chloride concentration on the removal of hexavalent chromium in a batch electrocoagulation reactor

Cited by 131 publications

References 37 publications

Effective parameters for the adsorption of chromium(III) onto iron oxide magnetic nanoparticle

Effective parameters for the adsorption of chromium(III) onto iron oxide magnetic nanoparticle

Effect of NaCl on Cr(VI) Reduction by Granular Zero Valent Iron (ZVI) in Aqueous Solutions

Treatment of Fez City (Morocco) Effluent by Chemical Coagulation (CC) and Electrocoagulation (EC)

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